WAVETEK

Transcription

WAVETEK

INSTRUCTION MANUAL
MODEL 166
50 MHz PULSE/
FUNCTION GENERATOR
WAVETEK
SAN DIEGO
9045 BALBOA AVENUE, SAN DIEGO, CALIFORNIA
INSTRUCTION MANUAL
MODEL 166
50 MHz PULSE/
FUNCTION GENERATOR
© -
1978
Wavetek
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO WAVETEK. THE INFORMATION IN
THIS DOCUMENT IS NOTTO BE USED OR DUPLICATED
IN ANY MANNER WITHOUT THE PRIOR APPROVAL
IN WRITING OF WAVETEK.
V'VAVETE~
SAN DIEGO
9045 Balboa Ave., San Diego, Calif. 92123
P. 0. Box 651, San Diego, California 92112
Tel 714/279-2200
TWX 910-335-2007
Manual Revision 3/80
Instrument Release F-3180
WARRANTY
All Wavetek instruments are warranteed against defects in material and workmanship for a period
of one year after date of manufacture. Wavetek agrees to repair or replace any assembly or
component (except batteries) found to be defective, under normal use, during this period.
Wavetek's obligation under this warranty is limited solely to repairing any such instrument which in
Wavetek's sole opinion proves to be defective within the scope of the warranty when returned
to the factory or to an authorized service center. Transportation to the factory or service center
is to be prepaid by purchaser. Shipment should not be made without prior authorization by
Wavetek.
This warranty does not apply to any products repaired or altered by persons not authorized by
Wavetek, or not in accordance with instructions furnished by Wavetek. If the instrument is
defective as a result of misuse, improper repair, or abnormal conditions or operations, repairs will
be billed at cost.
Wavetek assumes no responsibility for its product being used in a hazardous or dangerous manner
either alone or in conjunction with other equipment. High voltage used in some instruments may
be dangerous if misused. Special disclaimers apply to these instruments. Wavetek assumes no
liability for secondary charges or consequential damages and, in any event, Wavetek's liability for
breach of warranty under any contract or otherwise, shall not exceed the purchase price of the
specific instrument shipped and against which a claim is made.
Any recommendations made by Wavetek for use of its products are based upon tests believed to be
reliable, but Wavetek makes no warranty of the results to be obtained. This warranty is in lieu of
--··
·-··· ·-····
all other warranties, expressed or implied, and no representative or person is authorized to
represent or assume for Wavetek any Iiabil ity in connection with the sale of our products other
than set forth herein.
CONTENTS
SECTION 1
GENERAL DESCRIPTION
1.1
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1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-3
2.1 MECHANICAL PREPARATION............................
2.2 ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1
Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2
Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 ELECTRICAL ACCEPTANCE CHECK . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-1
2-1
2-2
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
SECTION 2
SECTION 3
MODEL 166 . . . . . . . . . . .
SPECIFICATIONS . . . . . . .
Versatility. . . . . . . . . . .
Sweep/Function Generator
Frequency Precision . . . .
Amplitude Precision . . . .
Waveform Characteristics .
Pulse Generator . . . . . . .
General . . . . . . . . . . . . .
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INITIAL PREPARATION
OPERATION
3.1 CONTROLS AND CONNECTORS
3.2 WAVEFORM TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 OPERATING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1
Continuous, Triggered and Gated Operation .................
3.3.2
Voltage Controlled Frequency (VCG) Operation ..............
3.3.3
Sweep Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4
Pulse Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.5
Voltage Controlled Amplitude (VCA) Operation . . . . . . . . . . . . . .
SECTION 4
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4-1
4-1
4-1
4-3
4-3
3-7
3-7
GENERAL . . . . . . . . . . . . . . . . . . .
BASIC WAVEFORM DEVELOPMENT
WAVE SHAPE AND AMPLIFICATION
TRIGGERED AND GATED MODES . .
SWEEP GENERATOR MODES. . . . . .
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FACTORY REPAIR.....................................
REQUIRED TEST EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALIBRATION........................................
5-1
5-1
5-1
TROUBLESHOOT! NG
6.1
6.2
6.3
SECTION 7
3-6
3-6
3-6
CALIBRATION
5.1
5.2
5.3
SECTION 6
3-1
3-4
3-4
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CIRCUIT DESCRIPTION
4.1
4.2
4.3
4.4
4.5
SECTION 5
2-2
fNTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACCESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1
6-1
6-1
PARTS AND SCHEMA TICS
7.1
7.2
7.3
DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ORDERING PARTS.................................. . . .
ADDENDA.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-1
7-1
7-1
iii
SAFETY
This instrument is wired for earth grounding via the facility power wiring. Do not bypass earth
grounding with two wire extension cords, plug adapters, etc.
BEFORE PLUGGING IN the instrument, comply with installation instructions.
MAINTENANCE may require power on with the instrument covers removed. This should be
done only by qualified personnel aware of the electrical hazards.
WARNING notes call attention to possible injury or death hazards in subsequent operation.
CAUTiON notes cail attention to possible equipment damage in subsequent operations.
v
.F,
•
•ii
,,, \ I
'luA1,1&
~N\.'HHW'
. . NS!TION
·rr~r
1'!*•'-f.
","NE•,,•
l!', ~'
Figure i - Model 166 50 MHz Pulse/Function Generator
vi
1
SECTION
GENERAL DESCRIPTION
1.1
MODEL 166
The Model 166 Pulse/Function Generator is a combination
sweep, function and pulse generator with a full complement
of features in all modes of operation. The frequency range
is from 0.0001 Hz (2.8 hours per cycle) to 50 MHz. Waveforms are sine, triangle, ramp, square, pulse, positive pulse
and negative pulse. The waveforms may be amplitude controlled, de offset and inverted (complemented).
Pulse versatility includes variable width and independently
variable leading and trailing edge transition times. The generator can be used to generate an output pulse whose width
and frequency are dependent upon an external signal input.
Sweep can be logarithmic, as well as linear. The output can
be stopped at the start and stop frequencies for accurate
setting. Besides continuous sweep, a sweep may be triggered
from the quiescent start frequency. The frequency can
sweep to the upper (stop) frequency, then return to start
frequency, or it can be held at the upper frequency. The
duration of the sweep can be set to be from 100 seconds to
100 micro-seconds.
The generator can give a continuous output, be triggered
for one cycle, or a double cycle, or gated for many cycles.
The output waveform can be presented in haverwave mode;
i.e., the selected waveform starts and stops at a positive or
negative peak voltage.
The signal being generated may be frequency or amplitude
modulated by external signals.
1.2
1.2.1
SPECIFICATIONS
Triggered: Generator quiescent until triggered by external
signal or manually, then generates one cycle.
Double Triggered: As triggered mode, except two cycles
are generated.
Triggered Haverwave: As triggered mode. Output is one
cycle starting at -90° (or +90°).
Gated: As triggered, except output continues for duration
of gate.
Gated Haverwave: As gated. Output is a burst of cycles
starting at -90° (or +90°).
Continuous Sweep: Generator frequency continuously
sweeps up from start to stop frequency.
Triggered Sweep: Generator oscillates at sweep start frequency until triggered, then generates one sweep to the
stop frequency and returns to the start frequency.
Sweep and Hold: As triggered sweep mode, except the generator remains at stop frequency unt11 the trigger signal falls,
then returns to start frequency.
Frequency Range
0.0001 Hz to 50 MHz in 11 ranges. Maximum sweep 1000: 1
in linear or logarithmic mode.
Versatility
Jnstrument operates as a sweep/function generator or a
pulse generator.
1.2.2
Operational Modes
Continuous: Generator oscillates continuously at selected
frequency.
Sweep Time Range
100s to 100 µs in 6 ranges.
Sweep/Function Generator
Selectable Waveforms
Sine I\.; , triangle 'V , ramp ~and square ~ . All can
be inverted 180°. Ramp up-down ratio can be as large as
1: 1000. All can be amplitude and frequency modulated.
Function Output
Variable to 30V p-p into open circuit ( 15V p-p into 50Q).
DC offset of waveform is adjustable to ±10V open circuit
(±5V into 50Q). Voltage attenuation 0 to 80 dB: to 60 dB
in 20 dB steps, plus 20 dB continuous vernier.
1-1
Low Frequency Hold
Step Attenuator Accuracy
Function output will hold at the instantaneous voltage level
when the hold switch is depressed. Effective in the X 0.001 Hz
to X 10 Hz ranges.
Amplitude Drift: Less than 0.2% of amplitude per minute.
±0.3 dB per 20 dB step to 100 kHz.
DC Offset
Sine Distortion (Test at 10V p-p normal sine wave)
DC offset of all waveforms is adustable to ±10V open circuit
(±5V into 50n). Waveform plus offset is limited to ±15V
open circuit (±7.SV into 50n).
GCV Outpul
1.2.5
Waveform Characteristics
Less than O.S% for 10 Hz to 100 kHz.
All harmonics greater than:
30 dB down for 100 kHz to 5 MHz;
20 dB down for S to 50 MHz.
0 to SV (nominal, open circuit) proportional to the frequency of the main generator. Output impedance is 600n.
Triangle Linearity
Sweep Output
Square Wave Aberrations (Test at 10Vp-p)
Less than 5% of p-p voltage.
0 to +5V (nominal, open circuit) ramp. Output impedance
is 600n. Sweep time is 1OOs to 100 µs.
VCG (FM) - Voltage Controlled Generator
Up to 1000: 1 frequency change with external 0 to +5V
signal.
Mode: Linear or logarithmic.
Slew Rate: 2% of range per µs.
VCG Linearity: 0.0005 Hz to 50 kHz ±0.5% of range.
Voltage Controlled Amplitude (AM)
0 to ±5V gives 0 to 30V amplitude change. AC input allows
0 to 200% modulation (suppressed carrier).
AC Input Range: SV minimum for 100%, 10V minimum
for 200% AM.
Input Impedance: 4.99 to 10 kn, depending on gain
control.
-------ini:>u_i_Bandwidth: 10 kHz.
Greater than 99% for O.OOS Hz to 100 kHz.
1.2.6
Pulse Generator
Pulses
Variable amplitude positive or complementary pulsesn__J,
Lii. Pulse amplitude, width and rise/fall times are independently adjustable and independent of frequency. TTL
and TTL pulse widths are simultaneous with main pulse.
AM and FM modulation. All pulses can drive son terminations.
Operational Modes
Continuous, Triggered, Double Triggered, Gated and Continuous Sweep. (See Sweep/Function Generator.)
External Width:
An external signal at the trigger input
- --- detemrineslhe-uutpULpatse-width--arrdfrequerrcy:-
Trigger Input
Pulse Period Range
Trigger Signal: 1V p-p minimum.
Trigger Level: ±5V.
Input Impedance: 1.S kn, 30 pF.
Maximum Repetition Rate: 2S MHz.
Pulse period is selectable from 20 ns to 1O,OOOs (SO MHz to
0.0001 Hz) with approximately 1% vernier.
1.2.3
Pulse Width
Frequency Precision
Dial Accuracy (For
of 0.5 to 5)
rv , /'y
,
'l.J
and linear dial settings
±2% of full scale for 0.0005 Hz to S MHz.
+ 15%,
1.2.4
- 6% of full scale for 5 to 50 MHz.
Amplitude Precision
Amplitude Change With Frequency
Sine and square variations less than:
±0.1 dB to 100 kHz;
±0.2 dB to 1 MHz;
± 3 dB to 50 MHz.
1-2
10 ns to 100 ms in 7 ranges. Maximum duty cycle is 70%
for periods to 200 ns, decreasing to SO% for 20 ns periods.
Control has nominal SO% duty cycle detent.
Transition Time
7 ns to 50 ms in 7 ranges, independently variable for leading
and trailing edges.
Function Output
0 to ±1 SV into open circuit and 0 to ±7 .5V into son.
Voltage attenuation 0 to 80 dB: to 60 dB in 20 dB steps,
plus 20 dB continuous vernier.
TTL and TTL Pulses
Transition times less than 4 ns into son termination.
1.2. 7
General
Stability
Amplitude, de offset and frequency in linear mode to
500 kHz.
Short Term: ±0.05% for 10 minutes.
Long Term: ±0.25% for 24 hours.
Dimensions
36.2 cm (14% in.) wide; 13.3 cm (5% in.) high; 38.1 cm
(15 in.) deep.
Weight
9.8 kg (21 % lb) net; 12.5 kg (27% lb) shipping.
Power
Environmental
Specifications apply at 25°C ±5°C after 30 minute warm-up.
Instrument will operate from 0°C to +50°C.
108 to 132V or 216 to 250V; 50 to 400 Hz; 50 watts
nominal.
1-3
2
SECTION
INITIAL PREPARATION
2.1
MECHANICAL PREPARATION
Card Position
After unpacking the instrument, visually inspect all external
parts for possible damage to connectors, surface areas, etc.
If damage is discovered, file a claim with the carrier who
transported the unit. The shipping container and packing
material should be saved in case reshipment is required.
2.2
2.2.1
ELECTRICAL INSTALLATION
100
120
220
240
1.
Power Connection
Input Vac
90
108
198
216
to
to
to
to
105
126
231
250
Fuse
(Slow Blow, 3 AG)
0.5 amp
0.5 amp
0.25 amp
0.25 amp
Disconnect the power cord at the instrument, open
fuse holder cover door and rotate FUSE PU LL to left
to remove the fuse (figure 2-1).
WARNING
To preclude injury or death due to shock, the
third wire earth ground must be continuous to
the facility power outlet. Before connecting to
the facility power outlet, examine extension
cords, autotransformers, etc., between the instrument and the facility power outlet for a
continuous earth ground path. The earth ground
path can be identified at the plug on the instrument power cord; of the three terminals, the
earth ground terminal is the nonmatching shape,
usually cylindrical.
CAUTION
To prevent damage to the instrument, check for
proper match of line and instrument voltage
and proper fuse type and rating.
Figure 2-1. Fuse Holder on Rear of Instrument
NOTE
2.
Unless otherwise specified at the time of
purchase, this instrument was shipped from the
factory with the power transformer connected
for operation on a 108 to 126 Vac line supply
and with a 0.5 amp slow blow fuse.
Conversion to other input voltages requires a change in rear
panel fuse-holder voltage card position and fuse according
to the following table and procedure.
Remove the small printed circuit board and select
operating voltage by orienting the printed circuit
board to position the desired voltage on the top left
side. Push the board firmly into its module slot.
3.
Rotate the FUSE PULL back into the normal position
and insert the correct fuse into the fuse holder. Close
the cover door.
4.
Connect the ac line cord to the mating connector at
the rear of the unit and the power source.
2-1
2.2.2
Signal Connections
SCOPE
Use RGSSU son shielded cables equipped with female BNC
connectors to distribute input and output signals when connecting this instrument to associated equipment.
2.3
ELECTRICAL ACCEPTANCE CHECK
MODEL 166
000
FUNC
OUT
This checkout procedure verifies the generator operation. If
a malfunction is found, refer to the Warranty in the front
of this manual. A 2 channel oscilloscope, a son load, a tee
fitting and son coax cables are needed for this procedure
(see figures 2-2 through 2-S).
Figure 2-2. Initial Setup
Preset the pulse generator controls as follows:
SCOPE
MODEL 166
Control
FREQUENCY Dial
FREQ Range
FREQ VERNIER
GEN MODE
TRIG LEVEL
LIN/LOG
DC OFFSET
VCA GAIN
WAVEFORM
OUTPUT ATTEN
OUTPUT ATTEN VERNIER
NORM/INVERT
SWEEP-MOUE.
SWEEP STOP
SWEEP TIME
SWEEP TIME VARIABLE
PULSE WIDTH
PULSE WIDTH VARIABLE
TRANSITION TIME
LEADING EDGE
TRAILING EDGE
POWER
Position
FUNC
X1K
cw
CONT
10 o'clock
LIN
OFF
ccw
!\_;
0
cw
NORM
OUT
Figure 2-3. VCG Setup
SCOPE
MODEL 166
COITT-SWP
cw
10s I 1s
12 o'clock
00
TRIG
FUNC
IN
OUT
'L
cw
7 ns I 50 ns
cw
cw
ON
Figure 2-4. Trigger Setup
SCOPE
MODEL 166
0
VCA
FUNC
IN
OUT
Figure 2-5. VCA Setup
2-2
Table 2-1. Initial Checkout
Step
Position/Operation
Controi
Connect instrument as shown in
figure 2-2 and sync scope to TTL
output.
Observation
I
I~~~.
1 kHz sine wave, 15V p-p.
de signal. Approximately 1 V.
I
I CH1: A small change in frequency ( 1% of range).
2
FREQ VERNIER
Rotate ccw, then cw.
3
FREQ Range
Check each position. Return to
x 1.
4
HOLD
Press and hold. Release.
5
FREQ Range
X 1K.
6
OUTPUT A TTEN
VERNIER
Rotate ccw. Return to cw.
Amplitude of waveform decreases for ccw change.
7
OUTPUT ATTEN
Check each position. Return to 0.
Amplitude of waveform decreases in decade steps
as attenuation increases.
8
OUTPUT ATTEN
VERNIER
Rotate to 9 o'clock.
9
DC OFFSET
Rotate cw thru -, 0 to +.
Return to OFF.
OUTPUT ATTEN
Vernier cw.
10
I CH1:
Frequency increases from ccw to cvv positions.
Waveform stops and holds at a de level. Waveform
continuous when switch is released.
Waveform moves to a negative offset, then to a
positive offset, as the control is rotated cw. Waveform clipping may occur at - and + ends of
control.
VERNIER
11
WAVEFORM
Each waveform is present; IL.._J and UI are both
positive going OV to +7.5V, but complementary to
each other.
n_____J •
NOTE: For proper waveform output in steps 12 through 16, the pulse period must be several times longer than the pulse
width and transition time. Change the FREQ range whenever necessary.
12
PULSE WIDTH
13
PULSE W!OTH
VARIABLE
14
TRANSITION
TIME
Rotate to each position. Return
to 500 ns I 5 ns.
15
LEADING EDGE
Rotate ccw.
1.NLde.r at..........
and ...----.........__.
Pulse width is narrow at ccw positions
-... ..----..-- .. -..
s_w positi.Qns.
Rotate to each position. Return
to 10 µs I 100 µs.
~~--~---.
I Rotate ccw. Return to cw.
Pulse 'J'!;dtf:
~ecomes
~,
....
.
i:arr·m•.1, ro,turris to \•.1ide
I
I Transition time decreases ccw and increases cw.
IWaveform
rise time increases, then returns to
\ original time.
2-3
Initial Checkout (Continued)
Step
Control
TRAILING EDGE Rotate ccw.
17
FREQ Range
XlK
18
NORM/INVERT
INVERT, then NORM
19
WAVEFORM
!\;
'l()
~JOR~v1/!NVERT
11\1\IC:DT
11\1. \I
~I\
i
r
.._1~~~
d1t;11
Observation
Waveform fall time increases, then returns to
original time.
16
LU
l\lf"'ID~A
1\IUllli/1.
Waveform changes from positive pulse to negative
pulse.
Waveform phase shifts 180°, from one switch
posi ti un tu the other.
Connect instrument as shown
in figure 2-3.
21
2-4
Position/Operation
22
FREQUENCY Dial Full cw. Sync the scope
to CHl (FUNC OUT).
23
GEN MODE
SWEEP.
Waveform is swept from a low frequency to a high
frequency.
24
SWEEP TIME
100 ms I 10 ms.
As the switch is rotated cw, the sweep duration
decreases. (Observe CH2 on fast times.)
25
LIN/LOG
LOG. Return to LIN.
26
SWEEP TIME
VARIABLE
Ccw increases sweep duration.
27
SWEEP MODE
SWP START.
CH 1: Frequency approximately 50 Hz.
CH2: 0 Vdc.
28
FREQUENCY Dial Rotate from cw to ccw.
Return to cw.
ov.
29
SWEEP MODE
SWP STOP.
CH2: Approximately 5V.
30
SWEEP STOP
CH2: DC level decreases, returns to 5V.
31
SWEEP MODE
TRIG SWP.
CH 1: Frequency approximately 50 Hz.
CH2: OV.
32
MAN TRIG
Press and release (try several
times).
CHl: Waveform is swept from a low frequency to
a high frequency.
CH2: 0 to 5V ramp for each burst of swept
waveforms.
CH 1: Waveform has longer low frequency sweep
in LOG mode .
.eHz: togarithmic-ramp inlOG mode.
CH2: DC level increases from 0 to 5V, returns to
One burst of swept waveform, then returns to start
frequency.
Initial Checkout (Continued)
Step
Observation
PositioniOperation
Control
33
SWEEP MODE
I SWP HOLD.
34
MAN TRIG
I Press and hold, then release.
Waveform sweeps up to high frequency and remains
while switch is held, returns to start frequency when
switch is released.
I
35
SWEEP MODE
CONTSWP
36
FREQUENCY
1
l
37
38
figure 2-4.
GEN MODE
TRIG. (Trigger scope on CH2.)
CH 1: Each waveform is one complete cycle.
Adjust scope for several triggered
cycles.
CH2: 0 to 5V ramp.
39
GEN MODE
DBL TRIG.
40
GEN MODE
TRIG HAV.
41
GEN MODE
GATED. Adjust scope for several
bursts of waveforms.
42
GEN MODE
GATED HAV.
43
WAVEFORM
fl__J_
44
GEN MODE
EXT WIDTH.
45
TRIG LEVEL
Rotate slowly.
Return to 10 o'clock.
I
Each waveform is two complete cycles.
Each waveform is one cycle starting and ending
at -90°.
J
Waveforms are in bursts of approximately 100 ms.
I
Burst of waveforms start at -90° and end at -90°.
I Pulse waveform.
Pulse varies in width.
Returns to original width.
figure 2-5.
46
47
GEN MODE
CONT.
48
OUTPUT
VERNIER
12 o'clock.
49
WAVEFORM
CH 1: Low to high amplitude bursts of waveforms.
I
50
VCA GAIN
Rotate from ccw to cw.
i
Amplitude modulation increases from 0 to
[maximum.
I
I
I
2-5
3
SECTION
OPERATION
3.1
CONTROLS AND CONNECTORS
The controls and connectors for the Model 166 are shown
in figure 3-1. The listing below discusses each control and
its function.
FREQUENCY/SWEEP START Dial - The main frequency control. The setting on this dial multiplied by
the frequency range (FR EO) setting is the basic output frequency of· the generator. The dial sets the
sweep start frequency when SWEEP mode (5) is
selected. (The FREQ VERNIER and VCG IN also
affect the generator frequency.) The outer scale has
linear distribution; the inner has logarithmic (2). The
dial index mark lights when power is on.
LIN/LOG Switch - This switch selects a linear change
in frequency or a logarithmic change in frequency
when sweeping (20), frequency modulating (23) or
using the frequency dial ( 1).
FREQ Range Switch - The 11 position outer switch
selects the generator frequency range, which, when
multiplied by the frequency dial setting ( 1), determines the basic output frequency of the generator.
VERNIER Control - The inner knob allows fine
control over the output frequency. A complete turn
of this vernier is equivalent to approximately one half
of the smallest division on the main frequency dial
(1). When in the full clockwise position (CAL), the
settings on the main dial will be accurate.
Figure 3-1. Controls and Connectors
3-1
TTL OUT and FUNC OUT signals are at a de level
until triggered. Output, compared to the input,
can be normal fL_J or complementary Lfl as set
by the WAVEFORM switch (8), or positive
(NORM) or negative (INVERT) as set by the
NORM/INVERT switch (10).
HOLD Switch - This switch holds the output at its
instantaneous voltage level. Operable in the X .001
through X 10 FREQ ranges (3) only.
0
GEN MODE Switch - The outer, 8 position switch
selects the operating mode of the main generator
as follows:
TRIG LEVEL Control - The inner control is a continuously variable adjustment of the TRIG IN (21)
circuitry. When full ccw, approximately a positive
going signal of +5V or greater voltage is required for
triggering (figure 3-2). In the full cw position, a positive going pulse of approximately -5V or more positive voltage is required for triggering. In the GATED
mode, the generator will begin to run continuously at
some position of the control cw past 12 o'clock.
When using the MAN TRIG, this control must be ccw
of the midpoint.
a. CONT Mode - The generator operates continuously as a standard Voltage Controlled Generator
(VCG). Frequency output is determined by front
panel control settings in conjunction with external
control voltage at VCG IN (23).
b. TRIG Mode - The generator will give one complete
l;yde \5LarliiiY al 0°) uf uulj.Jui. vvl1en lhe MAN
TRIG (6) is pressed or for each cycle of signal
applied to TRIG IN (21). A convenient trigger
source is the SWEEP OUT signal (17), since the
internal sweep operates independently of the main
generator.
c. DBL TRIG Mode - As for TRIG mode, except
two cycles are given.
TRIG LEVEL
CONTROL
ccw~~~~~~~~~~~~~----cw
d. TRIG HAV Mode - As for TRIG mode, except
the waveform ( I\;, /'y ) starts and ends at -90°,
rather than o0 ; this is a haverwave. For ~' f"1_J and
Lfl waveforms, this mode is identical to TRIG
mode, except the delay between TRIG IN (21) and
FUNC OUT (12) is increased.
+5V
··n··
TRIG LEVEL
TRIGGER SIGNAL
e ;- · 6A~ID--Mode ··..;.;: As fur-ffitfrmode;-excep t ti tat
the generator will continue to have output for the
full time that the MAN TRIG switch (6) is held
down or the gate signal at TRIG IN (21) exceeds
the gating level set by the TRIG LEVEL control.
f. GATED HAV Mode -As for TRIG HAV mode,
except that the generator will continue to have
output for the full time that the MAN TRIG
switch (6) is held down or the gate signal at TRIG
IN (21) exceeds the gating level set by the TRIG
LEVEL control (5i.
3-2
m
MYS+--S€-A~W.-p-p
POSITIVE GOING
SIGNAL EXCEEDING
THE TRIG LEVEL
SETTING
.Jl.•.
-5V ••
Figure 3-2. Minimum Trigger
g. SWEEP Mode - The generator operates in a sweep
mode determined by the SWEEP MODE switch
(20).
MAN TRIG Switch - When in any of the trigger
modes, pressing this switch furnishes the trigger. When
in any of the gate modes, this switch furnishes the
gate signal for the duration that it is pressed and held
down. The TRIG LEVEL control (5) must be ccw
from midpoint for proper MAN TRIG operation.
h. EXT WIDTH Mode - For~. fl_Jandlllwaveforms only. The main generator is disabled and
the output frequency and pulse width are dependent on the external signal input at the TRIG IN
BNC (21) or the MAN TRIG switch pulse (6).
DC OFFSET Control - This knob adjusts the de base
line offset above (+) or below (-) signal ground to
±10 Vdc into open circuit (±5 Vdc into 50!1 load).
Waveform plus offset is limited to ±15V open circuit
(±7.5V into 50!1 load).
WAVEFORM Selector - The six position outer
switch selects the waveform that appears at the
FUNC OUT BNC {12i. The waveforms are sine!\;, triangle /\v, ramp ./"'I, square ru, positive going pulse
fL_J and positive going complementary pulse Lii.
and l I I waveforms at FUNC OUT (12). It has no
effect on TTL and TTL outputs or on 1\;,1vand ~
VCA GAIN Control - When amplitude modulating
with a signal at the VCA (AM) IN BNC (22), the inner
knob determines the level of modulation by attenuating the input signal.
TTL OUT Connector - This BNC connector is a
source of TTL level pulses at the main generator frequency. Pulse characteristics are the same as for TTL
pulses (13) except amplitude is fixed at an inactive
leve! of approximately 2.4 volts and an active level of
0 volts when loaded with 50.Q.
OUTPUT ATTEN (dB) Control - The four position
outer knob attenuates the FUNC OUT waveform and
offset (12) from 0 dB (15Vp-p max into 50S1 LOAD)
to -60 dB (15 mV p-p into 50.Q) in 20 dB steps. The
inner VERNIER knob varies the attenuation over an
additional 0 to approximately 20 dB. Maximum
attenuation is 80 dB (1.5 mV p-p into 50.Q).
NORM/INVERT Switch - This switch inverts waveform output from FUNC OUT (12L inversion is
about the 0 volt axis of the non-offset waveform.
LEADING EDGE Control - For rt, ILJ and u-1
waveforms only. The outer knob varies the leading
edge transition time throughout the range indicated
by the TRANSITION TIME switch (14). Transition
time should not exceed the pulse width.
TRAILING EDGE Control - For rt, ILJ and lII
waveforms only. The inner knob varies the trailing
edge transition time throughout the range indicated
by the TRANSITION TIME switch (14). Transition
time should not exceed the "off" time of the pulse
period.
FUNC OUT, 50.Q Connector - This BNC connector
is the selected waveform output of the main generator.
Output level is 30V p-p maximum into an open circuit
or 15V p-p maximum into a 50.Q load.
TTL OUT Connector - This BNC connector is a
source of TTL level pulses at the main generator frequency. Pulse width, but neither amplitude nor transition time are controllable. Amplitude is fixed at an
inactive level of 0.0 volts and an active level of
approximately 2.4 volts when loaded with 50S1.
TTL pulse width is controllable regardless of the
waveform selected.
TRANSITION TIME Switch - This seven position
switch selects the range of pulse leading and trailing
·edge transition times. Actual in-range time is set by
the LEADING EDGE control (11). Affects rt, fl.__J
waveforms. Transition time shouid not exceed the
"off" time of the puise period.
PULSE WIDTH Switch - The outer eight position
switch selects the pulse width range. The rt position
ensures a 50% duty cycle pulse. The inner VARIABLE
knob varies the pulse width throughout the range
selected by the outer knob. This knob is inactive
when the outer switch is in the
position. The
-PULSE WIDTH switch affects rt, rl_J and lSI
output at FUNC OUT {12) and the TTL (13) and
TTL (15) outputs. The l\;,1v and /1 waveforms are
not affected. Pulse width cannot exceed 70% of
pulse period.
ru
SWEEP OUT, 600.Q Connector - This BNC connector
provides a fixed 0 to nominal +5 volts sawtooth waveform whose period is determined by the SWEEP TIME
control (18~; there is no output when SWEEP TIME
is OFF. Output also depends on the SWEEP MODE
control (20):
Position
SWPSTART
SWPSTOP
SWPOUT
ov
Approximately +5V
CONTSWP
Sawtooth
TRIG SWP
OV until triggered, then sawtooth
and return to 0 V
SWP HOLD
OV until triggered, then ramp to +5V
and hold for duration of trigger,
then return to OV
SWEEP TIME Switch - The seven position outer
knob provides a sweep duration range. The inner
VARIABLE knob selects the actual sweep time. An
OFF position ensures that the sweep generator is off
and has no effect on the frequency of the main generator.
3-3
signal that controls the main generator frequency.
With 0 volts in, the main generator frequency is determined by the frequency range selected and the frequency dial setting. A positive VCG voltage will increase this frequency, and a negative voltage will decrease the frequency. Operation is limited by the
FREQ range switch setting (3). A 5 volt excursion
will vary the frequency up to 1000:1, linearly or
GCV Out Connector - This BNC connector provides
the Generator Control Voltage, a nominal 0 to +5 volts
proportional to the main generator frequency.
SWEEP MODE Switch - The main generator frequency is controlled by the sweep generator when the
GEN MODE switch (5) is in SWEEP position; otherwise, the two generators are independent. The outer
five position switch selects the mode in which the
internal sweep generator affects the main generator.
The sweep start frequency is set by the FREQUENCY
dial ( 1) and the sweep stop frequency is set by the
inner SWEEP STOP knob (20). The sweep modes are:
a. SWP ST ART Mode - The main generator operates
at the freq11enr.y set by the FREQUENCY dial (1)
and in the range set by the FREQ switch ( 3). This
mode is used to set the sweep start frequency.
b. SWP STOP Mode - The main generator operates
at the frequency set by the SWEEP STOP knob
(20) and in the range set by the FREQ switch (3).
This mode is used to set the sweep stop frequency.
c. CONT SWP Mede - The main generator frequency
is swept up from the sweep start frequency to the
sweep stop frequency as preset in the SWP START
mode and SWP STOP mode and in the time determined by the SWEEP TIME switch (18); the signal
immediately drops to the start frequency and
sweeps again.
@·
TRIG IN, 1.5 kn Connector - This BNC connector is
de coupled with 1.5 kn, 30 pF input impedance.
Trigger signals must be 1V p-p or greater but within
the range of ±5V. The TRIG LEVEL control (5) adjusts the sensitivity of the generator to this input
signal. Trigger signal width must be 25 ns or greater.
Trigger frequency must be less than 25 MHz. The
trigger signal can trigger the main generator and/or
the sweep generator, depending on the mode of
operation selected.
VCA (AM) IN, 3 kn Connector -This BNCconnector
has input impedance of 4.99 to 10 kn depending upon
the VCA GAIN setting (8). With VCA GAIN fully cw,
0 to ±5 volts gives a 0 to 30 volt amplitude change;
5 Vac gives 100% modulation; 10 Vac gives 200%
modulation (suppressed carrier). Increased voltages
are required when the VCA GAIN control is used.
AM signal bandwidth is limited to 10 kHz.
@
3-4
VCG (FM) IN, 6 kn Connector - This BNC connector
is the Voltage Controlled Generator signal input, a
logarithmically.
POWER Switch - Power is on when this pushbutton
switch is in, and off when extended.
3.2
WAVEFORM TIMING
The relationship among waveforms for different modes is
illustrated in figure 3-3.
3.3
OPERATING PROCEDURE
No preparation of the instrument is required beyond completion of the initial checkout given in paragraph 2.3. It is
recommended that a one-half hour warm-up period be al·
lowed for the associated equipment to reach a stabilized
operating temperature, and for the Model 166 to attain
stated accuracies. The operator should be familiar with the
controls and connectors given in paragraph 3.1 and the
waveform relationships given in figure 3-3.
There are almost unlimited ways to set up the generator
and waveforms that may be obtained. The following sections
desCrlbe-basic--c-onriguraffons anc:rn-ow tcJ" sertnem u-p.
Notice the grouping of controls on the front panel:
a.
the waveform and amplitude group
b.
the pulse characteristics group
c.
the sweep group
d.
the frequency and operating mode group
Internally, the sweep group will be used only in sweep
mode. In addition, the sweep generator can be used as an
independent signal source with its own output. This is a
convenient source of trigger and modulating signals for the
main generator. The pulse group is used only for altered
forms of the ~ , f1_J and LJI waveforms.
The setup instructions given in the next paragraphs must
necessarily be general. They are divided for five applications
which can be combined as required:
SELECTED WAVEFORM
TRIGGER SIGNAL
I
MODE
I
BNC
I
TRiGGER Lt::Vt::L
(FULLY CCW)
I
CONT
I
FUNC
OUT
TTL
ov_
FUNC
OUT
I
I
f'v
ln~-----1
I
I
:~_n :_1Ln_~~n
I
I
I
_
-(\;------- Ul'------------+-:_n.______--'---__,___
I
~
I
I
I
1
I
I
~
:u
:_n
:_n
I
I
~'--------'---
ov_
FUNC
OUT
DBL
I
I
I
I
I
~...____
f'v
TTL
I TRIG
U1JlJlJUl
n
n
n
n_ __J
n
_!_J L__J L_J ~ L
_ _I
I
TRIG
1
OV-
I
I
I
TTL
I
TRIG
HAV
FUNC
OUT
OV-
TTL
:n
:_n
I
ii\
j\
-f
-¥
_l_fl
l_fl
l_n
ii\
i---'
I
I
I
GATED
II
I 11
_u
TTL
I
I
I GATED I
HAV
~UV-
ov_
FUNG
OUT
I
I
FUNC
OUT
OV-
rl
LJ
II
LJ
II
LJ
L_
I
I
I r-,
_Jj
I
I
,--,
LJ
,--,
11
LJ LJ
lN\N\_
L_
I
n
n
n
n
I ,-,
LJ
_!_J LJ L_J L_J L__
I
r--,
LJ
,-,
LJ
I
r+--,
LJ1
_ I_ _
I
I
I
ITTJlJlfL
I
~·-1_Jr--1LJ.--l_J~LJr--!
:J--LJ~ur--LJiLJ__...
I
I
I
I
I
~_JU\_J\j\J
J
11JlJlJ:lJL
TTL
CONT
SWEEP
FUNG
OUT
OV-
TTL
I
I
EXT
WIDTH
FUNC
OUT
TTL
I
OV-
NOTE:
INVERTED WAVEFORMS ARE INVERTED ABOUT THE av AXIS.
TTL WAVEFORMS ARE NOT AFFECTED BY WA VE FORM INVERSION.
-I
Figure 3-3 Waveform Relationships
3-5
a.
Continuous, triggered or gated operation
b.
Voltage controlled frequency (VCG) operation
c.
Sweep operation
d.
Pulse operation
e.
Voltage Controlled Amplitude (VCA) operation
3.3.1
Continuous, Triggered and Gated Operation
Operation in these modes is set up using standard waveforms. After getting results with a standard waveform, refer
to paragraph 3.3.4 for pulse setup, if desired.
1.
For most accurate results, place the generator in continuous mode and monitor the setup of the controls
with an oscilloscope. Connect FUNC OUT to the
oscilloscope and sync to this signal. It is best to use
an oscilloscope with greater than 250 MHz band
width or a sampling oscilloscope. To view the high
frequency performance with a real-time scope, use a
50rl, 10: 1 attenuator at the scope input to reduce
the capacitive loading due to the scope.
2.
Set the frequency controls for the desired frequency.
3.
Select the waveform, attenuation and offset. This
completes the setup for continuous mode.
4.
2.
For frequency control with negative de inputs at
VCG IN, set the dial for an upper limit from which
frequency is to be decreased.
3.
For modulation with an ac input at VCG IN, set the
dial at the desired center frequency. Do not exceed
the maximum dynamic range of the selected frequency range.
Figure 3-4 is a nomograph with examples of the frequency
dial effect as a reference for VCG IN voltages. Example 1
shows that with OV VCG input (2nd column), frequency
(3rd column) is as determined by the frequency dial setting
of 2 (1st column). Example 2 shows that with a positive
VCG input, output frequency is increased. Example 3 shows
that with a negative VCG input, output frequency is dec1 eased. {Note that the Factor of 50.Q OUI Frequency
column must be multiplied by the frequency range in order
to give the actual 50Q OUT frequency.) For full 1000: 1
linear mode VCG sweep of the generator frequencies, set
the FREQ VERNIER full ccw.
NOTE
The FREQ VERNIER must be rotated full ccw
for 1000: 1 linear or logarithmic range.
FREQUENCY
DIAL SETTING
(5)
5
If one of the triggered or gated modes is desired, select
the mode. If triggering is manual, rQtate the TRIG
LEVEL fully ccw. This completes the setup for manual triggering or gating.
VCG
VOLTAGE
-5Vl
-4V
4
=3V
-2V
(.5)
3
-1V
......
.........._. ...ov.
.
5.
FACTOR OF
5onouT
FREQUENCY
(.005)
.05
If an external trigger signal is to be used, connect a
qualified trigger source (paragraph 3.1) to the TRIG
IN BNC and to the oscilloscope trigger input. Set the
scope to trigger on the external signal. Rotate the
Model 166 TRIG LEVEL control fully ccw, then
rotate cw until the desired triggering occurs.
2
(.05)
(.005)
-::::...-
+1V
............
'..t2V
.t
.... '?I
. . . ~f\--~
i;;,-f...~
_ .2
(.05)
- -t-APLE 2
E~p..
3
(.5)
+Jv' €'~-<!
4
. . . . ~Pt..€'
+4V
....... ...... 1
.05
+5V
l> (5)
LINEAR AND (LOGARITHMIC)
Figure 3-4. VCG Voltage-to-Frequency Nomograph
3.3.2
Voltage Controlled Frequency (VCG) Operation
Set up the controls as given in paragraph 3.3.1 for continuous operation. The frequency selected will be the reference
frequency. A voltage at the VCG BNC will cause the frequency to deviate from the reference frequency.
1.
3-6
For frequency control with positive de inputs at VCG
IN, set the dial for a lower limit from which frequency
is to be increased.
3.3.3
Sweep Operation
1.
Set SWEEP MODE to SWP START and adjust the
FREQUENCY dial and FREQ range for start sweep
frequency.
2.
Set SWEEP MODE to SWP STOP. Set SWEEP STOP
control for the desired upper frequency.
Set GEN MODE switch to SWEEP and SWEEP TIME
switch to the approximate sweep duration desired.
3.
Set to CONT SWP mode and sync the oscilloscope
with the SWEEP OUT signal. This completes the
setup for continuous sweeping.
4.
If a triggered sweep mode is desired, select TRIG SWP
or SWP HOLD, connect a qualified trigger source
(paragraph 3.1) to the TRIG IN BNC and to the
oscilloscope trigger input. Set the scope to trigger on
the external signal. Rotate the Model 166 TRIG
LEVEL control fully ccw, then rotate cw until the
desired triggering occurs.
5.
~1
n
n___J (Normal)
r--
~
~
LJI
30 ns
i
r-
125 ns
r-
95 ns
I
LJ
(Complement)
Set the pulse leading and trailing edges. Pulse transition times are restricted to less than pulse width.
3.
Pulse Operation
3.3.4
1.
OUTPUT
WAVEFORM
Set up the controls as given in paragraph 3.3.1 for
continuous operation. For pulse operation, select
'1 , fl._j or Ln waveform, normal or inverted
(figure 3-5).
2.
Set the pulse width as desired. Keep in mind that the
pulse width cannot exceed approximately 70% of the
"normal" waveform period. For wider pulses than
those that can be normally obtained, set up the n___J
pulse with the complement of the width that is
desired, then switch to the complement pulse ( UI ).
For example, a 95 ns pulse with a 125 ns repetition
rate is desired. The complement of 95 ns is
125 - 95 = 30ns
Set up a 30 ns pulse with a 125 ns repetition rate
and switch to the complement pulse as shown.
WAVEFORM
ru
ru
Voltage Controlled Amplitude (VCA) Operation
Set up the controls as given in paragraph 3.3.1 for continuous operation. The amplitude selected will be the reference
amplitude. A voltage at the VCA BNC will cause the output
amplitude to deviate from the reference amplitude. The VCA
GAIN control can be used to attenuate the VCA input. For
AM operation, 5V p-p gives 100% amplitude control or
modulation, while 10V p-p gives 200% (suppressed carrier)
modulation.
(With some "pulse width" and
"transition time" selected)
OUTPUT
NORM/INVERT SWITCH
3.3.5
REMARKS
Amplitude is arbitrarily one.
NORM
--=i------1------\--- --/-------}
INVERT
0
lLJ
NORM
o _j _____ \
Lil
NORM
a _-:J
n_J
INVERT
O --,- - - - - ;
UI
INVERT
O
~
;_ ____ }.-_ _ _ }
/ ______ }
[ _____ \
\
- - - - - - -,
-7
1
Inversion rotates
'1
about 0 axis.
%1 A Oto Vppuise.
11.1
The complement of
1LJ.
I
} % I Inversion rotatesfl_Jabout 0 axis.
\ - - - - - - }
% Inversion rotatesLJlabout 0 axis.
Figure 3-5. Comparison of Available Pulses
3-7
4
SECTION
CIRCUIT DESCRIPTION
4.1
GENERAL
The circuits summarized in figure 4-1 are placed on two circuit boards in the generator. All circuits outside the dotted
lines of the Sweep and Transition Time board (-0629) are
on the Main board (-0628). The manual controls and connectors are mounted on the front panel. The power supply,
which is not shown, is located on the rear panel and Main
board.
4.2
BASIC WAVE FORM DEVELOPMENT
The heart of the generator (the bold path in figure 4-1) is a
triangle and square ~ave generator. The triangle waves are
developed by charging a capacitor with constant curr~J11$
tha_!.}1_rn_~a~~e_r~~ately reversed~-~ po_t~r,:ity. ---The. pdiarit;
reversal is caused ·by--~dflp-flop.ci~cuit, or hysteresis switch,
that in turn produces the square waves. The flip-flop
changes states, causing the constant current to. change
polarity, upon detecting amplitude limits of the triangle
waveforms.
During the time the output voltage of the triangle amplifier
is rising, the output voltage of the hysteresis switch is positive, but when the output voltage of the triangle reaches
+1.25V, it triggers the hysteresis switch, causing the output
to switch negative. Once the con.trot voltage into the diode
gate becomes negative, it will switch the positive current
out and switch the negative current in to the integrating
capacitor, so that the voltage across the capacitor will reverse,
starting a linear decrease of the triangle wave. When the decreasing voltage reaches -1.25V, the output of the hysteresis
switch will switch back to positive, reversing the process.
This action generates the triangle waveform as shown in
figure 4-2. Since the output of the hysteresis switch is a
square wave, the result is simultaneous generation of a
square wave and a triangle wave at the same frequency.
The output frequency is. determined .by. the magnitude of
the capacitor selected by the frequency multiplier and
magnitude of the current sources. Since the current sources
are linearly proportional to the control voltage of the VCG
circuit, the output frequency will also be linearly proportional to the control voltage. The relations become logarithmic if the log mode of operation is chosen. The capacitance
multiplier is used to sink a precise amount of the current
supplied to the integrating capacitor on the low frequency
ranges.
The VCG dial buffer ~urns the currents from the frequency
dial, frequency vernier, VCG IN connector and the sweep
circuit. The VCG dial buffer is an inverting ampiifier whose
output voltage can be applied directly to the GCV amplifier
or through the log converter to the GCV amplifier. The output voltage of the GCV amplifier controls the positive and
negative current sources. This voltage is also present at the
GCV OUT connector. For all waveforms except the ramp
the currents from the two current sources are equal and
linearly (logarithmical ly in log mode) proportional to the
voltage of the VCG dial buffer output in linear (log) operation. The diode gate, which is controlled by the hysteresis
switch, is used to switch the positive or negative current to
the integrating capacitor selected by the frequency multiplier. If the positive current is switched into the integrating
capacitor, the voltage across the capacitor will rise linearly
to generate the triangle rise transition. If the current is
negative, the voltage across the integrating capacitor will
fall linearly to produce the fall transition.
The output of the hysteresis switch is-shifted to MECL level
and fed to the pulse width circuitry. The pulse width is
determined by varying the RC time constant of an MECL
one-shot. The output of the pulse width circuit feeds the
TTL and TTL buffer and the rise/fall circuit. The TTL and
TTL buffer circuit provides an approximate 0 to 2.4V output
into 50 ohm load. The rise/fall circuit controls the transition
time via selected RC networks, then returns the shaped
square wave to the square wave clipper on the main board.
When a square or pulse mode is selected, this clipper is acti·
vated to supply the signal to a pair of transistors which convert the single ended pulse to the differential input required
by the multiplier.
The triangle amplifier is a unity gain amplifier whose Oljtp_u.t..
i.s...Jed to the hysteresisswi tc,h. The hysteresis switch has
.tw~~-olt~-g~- limit-poin.ts (app·~;)cimatety ±1.25V) at its input.
The triangle wave from the triangle amplifier is coupled to
another pair of transistors and the sine converter. This pair
of transistors are turned on when triangle or ramp are selected
4.3
WAVE SHAPE ANDAMPLIF ICATiON
4-1
SWEEP & TRANS TIME BD
TTL
(-~)
OUT
(50rll
~
~
TTL&TTL
BUFFER
EXTERNAL WIDTH
TTL
OUT
(5M2l
PULSE
WIDTH
RISE/FALL
TRIG LEVEL
-~+
.,.
- TRIGGER
. SQUARING
IN
~
1-+l
I
rr
TRIG
CONTROL
LLOGIC
~~~~~~~~~~~~~--1~~~~~
:'
v
v
1
SWEEP
OUT
LEAD TRAIL
EDGE EDGE
(600!"°21
~
I
_J
L
VCG (FM)
+
I
DC
OFFSET
IN
6k!"°2
~
POSITIVE
CURRENT
---------•--i
HYSTERESIS--------. .
ru
___W_!.LFiC_L
FREQ
DIODE
GATE
NEGATIVE
CURRENT
1--~~~~~-'
SOURCE
FREQ
VERNIER
MAIN BO (-0628)
Figure 4-1. Generator Block Diagram
4-2
(50!"°2)
MULTIPLIER
LIN
LOG
CONVERTER
FUNC
OUT
SWITCH
~~--~~~-.
I
ATTEN
~
HOLD
CAPACITOR
MULTIPLIER
SINE
CONVERTER
GCV
OUT
(600!"°2)
~
4.4
HYSTERESIS
SWITCH
L
I I
I
A
I
B
+1 .25V - - - - - - -
A,B
-1.25V
22
c + _v I
I I I I
TRIGGERED AND GATED MODES
In the triggered and gated modes, the forward biased trigger
diode sinks the current from the positive current source,
thereby preventing the integrating capacitor from charging
and, therefore, the generator from oscillating. The trigger
pulse resets a flip-flop which reverse biases the diode, so the
capacitor begins to charge. The hysteresis switch transition,
which occurs when the triangle wave reaches its negative
peak, clocks the flip-flop back to the original state, which
prevents the voltage at the integrating capacitor from rising
above ground. In the haver modes, this voltage is held at the
negative triangle peak. In gated mode, the falling edge of
the trig in signal (the gating signal) releases the flip-flop to
clock on next hysteresis switch transition occurring at a
negative triangle peak. This forward biases the trigger diode
so the voltage at the integrating capacitor may not rise above
the set voltage (ground or the minus peak). The double trigger is accomplished by a series of flip-flops which "count"
two negative triangle peak transitions of the hysteresis switch.
-2.2V
Figure 4-2. Basic Generator and Timing Diagram
and convert the single ended output to the differential input
needed by the multiplier. The output of the sine converter
is coupled through a similar pair of transistors before reaching the multiplier.
The amplitude vernier voltage and the VCA IN voltage are
summed in the summing amplifier whose output is used to
control the multipliers output amplitude. The phase of the
output waveform is determined by the polarity of this
voltage with the NORM/INVERT switch controlling the
polarity of the de from the amplitude vernier. In addition
to being coupled to the modulating input of the multiplier,
the output of the summing amplifier is coupled to another
de amplifier which keeps the pre-amplifier summing junction
at the appropriate level when normal or complimentary
pulse is selected.
A current mirror is used to convert the multiplier differential output to single ended output before it is applied to the
inverting pre-amplifier. The output of the pre-amplifier provides an input to the summing junction of the output amplifier. The de voltage from the DC OFFSET switch and
potentiometer are also added in at the summing junction.
The signal is again inverted and amplified before it is applied
to the attenuator. The attenuator provides 60 dB of attenuation in three 20 dB steps. Maximum output at 0 dB is 15V
into a 50 ohm load. Arljustment between steps is provided
by the vernier.
In EXT WIDTH mode, the signai to be shaped is appiied to
TRIG IN where it is squared in the trigger squaring circuit
before being coupled to the rise/fall circuit, from which
point it follows the normal square wave path. The generator
must be set to square wave of pulse to obtain an output.
4.5
SWEEP GENERATOR MODES
The sweep generator is an independent generator with a 0
to +5V ramp out at the sweep out connector. It will drive
up to 600 ohm impedance and can be used to externally
trigger, VCG or VCA the main generator by connecting
sweep out to the appropriate front panel connector.
The sweep generator can also be connected to the main
generator internally by selecting SWEEP on the GEN MODE
switch. The basic sweep generator consists of the current
source, FET input amplifier, clamping circuit and hysteresis
switch.
The current source charges a capacitor with a constant current which produces a voltage ramp across the capacitor.
The ramp is buffered by the FET amplifier and applied to
the hysteresis switch. When the ramp reaches the threshold
voltage of the hysteresis switch, it changes state a11d discharges the capacitor very quickly through the discharge
diode. The clamping circuit clamps the peaks of the ramp
to precise levels which assume 1000: 1 sweep control.
As the output of the sweep generator is internally connected
to the input of the VCG dial buffer, it controls the frequency of the generator.
4-3
In SWP START mode, the sweep generator is held at its OV
peak so that the start frequency may be set with the combination of the frequency dial, frequency range and vernier.
In SWP STOP mode, the sweep generator is held at its +5V
peak, so that the portion of the voltage to reach the VCG
dial buffer may be set in SWEEP STOP mode which determines the maximum frequency. In CONT SWP mode, the
main generator is swept between the frequency limits set by
sweep start and stop.
In TRIG SWP mode, the main generator oscillates at the
start frequency until the trigger input triggers the sweep
4-4
generator. At the end of one ramp, the main generator returns to the start frequency and waits for the next trigger
pulse.
In SWP HOLD mode, the main generator oscillates at the
start frequency as long as the trigger input signal is below
the trigger level threshold. As the threshold is crossed, the
main generator is swept up to stop frequency, where it will
remain until the trigger input falls below the threshold, at
which time the main generator returns to the start frequency.
5
SECTION
CALIBRATION
5.1
5.3
FACTORY REPAIR
Wavetek maintains a factory repair department for those
customers not possessing the necessary personnel or test
equipment to maintain the instrument. If an instrument is
returned to the factory for calibration or repair, a detailed
description of the specific problem should be attached to
minimize turnaround time.
5.2
CALIBRATION
Perform calibration according to table 5-1. If performing a
partial calibration, check previous settings and adjustments
for applicability. See figures 5-1, 5-2 and 5-3 for calibration
point location.
son cable for all instrument connections.
1.
Use
2.
Allow the instrument to warm up at least 30 minutes
for the final calibration. Keep the instrument covers
on to maintain heat. Remove covers only to make adjustments or measurements.
REQUIRED TEST EQUIPMENT
DVM ....... Millivolt de measurement (0.1 % accuracy)
Differential Osci!!oscope, Dual Channel 500 MHz bandwidth
Distortion Analyzer . . . . . . . . . . . . . . . . . . . 600 kHz
Frequency Counter .......... 50 MHz (0.1 % accuracy)
Table 5-1. Model 166 Calibration Chart
Step
-
1 Power
Supplies
2
-;i
-
Calibration
Point
Tester
Check
-0628-TP1
DVM or
Differential
Scope
-0628-TP2
I
-0628-TP3
4
-0628-TP4
5
-0628-TP5
-
I
I
II
I
Control Setting
Remarks
Adjust Desired Results
-0645FREQ: X 1K
R16
FREQUENCY:5
FREQ VERNIER: CAL
GEN MODE: CONT
DC OFFSET: OFF
WAVEFORM:~
OUTPUT ATTEN: 0
OUTPUT VERNIER:
-064512 o'clock
R24
SWEEP MODE:
I
CONTSWP
SWEEP TIME: 10s I 1s
PULSE WIDTH:~
TRANSITION TIME:
7 ns I 50 ns
"LEADING EDGE: F ult ccw1
!TRAILING EOOE: Full ccw
LIN/LOG: LIN
NORM/INVERT: NORN
+12 Vdc ±50 mV All measurements are referenced to ground.
-12Vdc±100mV
+22Vdc±400 mV
-22 V de ±400 mV
+5.2Vdc±20mV
I
I
I
I
i
I
5-1
Table 5-1. Model 166 Calibration Chart (Continued)
Step
6 Hysteresis
Switch
I Balance
I
I
I
i
I
I
I
I
I
I
I
I
I
!
i!
I
1
f1
J
Am-
I
l
I
8
I ty
Am- , DVM
plitude Zero j
-0628-TP6
I
I
I
I
WAVEFORM:
:..ri::t
Scope
Null
FUNC OUT GEN MODE: CONT
WAVEFORM: I\;
10UTPUT VERNIER:
J Full ccw
I
.i
.
tort1on
IDistortion
i
J
WAVEFORM:
I\;
Analyzer
i
!
- - -i-1\-- --
12
1 ·
'Y Offset
Shift
14
I
l
I
I
I
j
-0628- IMinimum sine
R 103, distortion
!R142 I
IDifferential
II -0628-TP7
WAVEFORM:
I\;
I
I
I
5-2
!
I
I
!
J
I.different between normal
and inverted.
-0628-1 Positive and neg- j
R308 I ative peak voltages are within I
15 mV of each
other.
I
I
II
1'
I
I
Scope
I
I
-·-·· -- -·-··--· ··-- ···-· - Neglect the de offset if
any. Amplitude may be
·---~-------
. Verify or retrim R212.
-0628 '\J and 'V
Select peaks are within ,1
R212 ±50 mV
WAVEFORM: Switch
between I\; and ty
I
16 Output
Amplifier
Zero
JTrim R216, R226 and
IR238forlowest distortion
I(typically 0.15%).
I
I
I\; Amplitude
15 Preamp
Zero
-0628- As near de as
1
,R330,
possible
IR334
- .i--------- ---;---------·-·-----------·------· -.
-0628- i No de shift beR241 !tween normal
1
I
- - - - - - - - - - - 1 and inverted
WAVEFORM: 'V
-0628-joutput
R210 I
·,
v Offset ! Scope
Ii Shift
13
I
WAVEFORM:~
1-0628-!Time symmetry isee figure 5-4 for equip1
j
Set output for 10V p-p IR46 !within ±0.1%
iment setup. Set scope to
I
j20 µs/div.
I
· 1
I
-0628- 0 Vdc ±5 mV
jR86
10 i Time Sym! metry
,- ,- .i I\; Dis-
-0629- ~Offset
R31 -~ OV ±50 mV
GEN MODE: TRIG
I
9 Multiplier
Remarks
I
iI
l-0628-TP8
I
I plitude Zero
Adjust Desired Results
-0628· 1 '1 Offset
R150 OV±100mV
i
i
!
Control Setting
-0628-TP9
Scope
I
Ii
Calibration
Point
Tester
Check
I
I
FUNC OUT
.
-0628- Positive and neg-
IR248
,·
I.
Iative peak_vo.lt. ages
I
I
I
are within
i
mV of each
1. other.
I
120
I
I
Step
17
'1'
fl
Scope
tive Peak
18
Calibration
II Check II Tester I Point I Control Setting
I~'l..J p OSl-. Differentiai FUNC OUT tWAVEFORM: ~w1tcn
I f"l.J
I
Offset 1scope
between
1\;, and f"l.J
WAVEFORM:
nu
Shift
I
19
ru Normal/Inverted
IAmplitude
20 [output
(mp!itude
I
21
Trigger
Baseline
22 jHaver
Baseline
23 VCG Null
I
I
I
!Adjust
r·•;red
Resulu
'1
-0628- INo de shift be- !Amplitude can be differlent between normal and
R203 ltween normal
1
and inverted out- inverted output.
put (or match to
the negative 1\;
peak)
!WAVEFORM:!\;
OUTPUT VERNIER:
Full cw
-0628-1 Peak-to-peak
R254 voltages are
15v ±150 mV
WAVEFORM:!\.;
GEN MODE: GATED
-0628- 0 Vdc ±20 mV
R86
Connect SWEEP OUT
to TRIG IN
SWEEP TIME: 10 ms I ms
Remarks
f -0628- Positive peaks of Verify or retrim R212.
f"l.J to !\; are
R 198
I
within 50 mV
-0628- Zero levels are
WAVEFORM: ru
Switch between NORM R297 within 50 mV
and INVERT
IGEN MODE: TRIG HAV
I
Neglect the de offset if
any.
I
I -0628- IBaselines are at !Set the trigger level conR 178 the same level of jtrol to obtain a burst of
the negative peak !\.; signal.
I
·
-0628- Less than 1%
GEN MODE: CONT
frequency shift
R4
FREQ: X 100K
!while opening
FREQUENCY: Full cw
I
WAVEFORM: nu
Set output to 1OV p-p
!
1
1aVrC,dGsh1uN-rtti ng
1
0
I
I
ground
I
24
I1000: 1
LIN/LOG: LOG
Time Symmetry
1-0628- Each half cycle
1
f"l.J is 1.2 ms
R34,
and symmetry
R59
is< 1%
1
I
2.5 Symmetry
at 5X1 kHz
LIN/LOG: LIN
FREQ:X1K
FREQUENCY:5
~FREQ:
X 1M
IFREQUENCY: 0.5
27 Symmetry
at 0.5 X
10 MHz
FREQ: X 10M
I -0628R46
! -0628-
I R47
Time symmetry
within 0.1%
Tme symmetry
within 0.2%
-0628- Time symmetry
1%
R45
(trim)
<
I
R45 must be installed for
unit to oscillate on X 10M
range. Verify or retrim.
5-3
Step
28
Check
Calibration
Point
Tester
Frequency
Frequency
Counter
TTL OUT
!
I
I
IAd JU. St
Control Setting
Desired Results
!
-0628- 5 kHz ±10 Hz
R13
IFREQ:X1K
1 FREQUENCY: 5
I
I
I FREQ: x 100
I
I
!
31
I FREQ: x 1M
::~8-
I
R16
IFREQ: x lOK
1
!
35
36
Low Frequency
IScope
II
I
I Counter
I
Logarithmic!
Frequency
.. ---·--·-··
i
I
j
I
I
I
I
I
I
I
I
I
40 Sweep
Ramp Positive Peak
41
Sweep
Ramp Zero
Peak
5-4
Sampling
Scope
1
!
-0628-j 1.99 kHz ±40 Hzlcross Reference of Dial
R50 l
lDial (lin)
Dial (log)
---1-
SWP OUT
(no load)
I
-r·
i
LOG
----------l
I
I
-0628-1125.6 kHz
R20
±2.5 kHz
I
I
I
I
FUNC OUT WAVEFORM: 'l.J
I LIN/LOG: LIN
I
I FREQ: X 10M
I
FREQUENCY: 0.6
Scope
I
-
iTrim R181 if R182 in
I
1stops.
i
I
I
High Frequency
1
Waveform
I
Repeat steps 24, 36
and 37 several times
I
39
-0628-150 Hz ±0.2 Hz
R182 (20 ms ±40 µs)
I FREQUENCY: 4
I
I
38
FREQ:-X-WOK
I LIN/LOG:
I
I
I
-0628- 50 kHz ±100 Hz Trim R117 if R17 in
R17
stops.
I l
! scale)
I
I
, -0628- Time symmetry
I TTL OUT I FREQUENCY: 5
I
.
I
I
I FREQUENCY: 1 (Lin
I
ITrim C27 ifR 15 in stops.
I R 188 Iwithin 0.2%
I
-!
I
1
FUNC OUT! FREQ: X 10
I FREQUENCY: 0.5
I
5 MHz ± 10 kHz
-0628- 500 kHz ±1 kHz !Trim C25 if R16 in stops.
I
jquency
!Symmetry
-0628-1500 Hz ±1 Hz
R18
-0628- 50MHz±500kHz IC22/23 may be added to
l
C24
lower frequency.
FREQ: X 100K
34 , Low Fre-
jR 13 affects frequency
jcalibration in all frequenI
jcy ranges.
'FREQ:X10M
I
33
l
I
1
30
Remarks
I
I
-
II
SWEEP MODE: CONT
SWP
SWEEP TIME:
100 ms I 10 ms
SWEEP TIME VARIABLE: Full cw
-0628- Minimum rise/
R266, fall time and
1
R285 abberation
R351
-0629- Positive peak
R110 just starts to
flatten
I
I
-0629- Zero peak just
R107 starts to round
I
I
0
.005
1
1.67
2
3
3.33
4
5
.020
.050
.079
.316
.500
1.26
5.00
I
1
I
Tester
Scope
42 Sweep
Ramp Start
Calibration
Point
I
I
swP ouT
(no load)
43 Final Calibration
(optional)
I
I
I
Control Setting
I
swi=i::p
.......... MODE· swP
START
I
I-
Adju.J Desired Results
06291 OV (0 to
-
Remarks
5 mv)I
R62
Close covers and warm
up for 1 hour; repeat
step 11, then step 28.
I
I
Sine distortion calibrati on wil I affect all frequency calibration. Adjusting Ri3 wili restore
the frequency calibration.
I
R24
+5.2V
ADJ
Ci S
ll
.L ~ i ~
~iyy
[1
EIO
E9
Figure 5-1. Power Supply (-0645) Calibration Points
5-5
-···-·-----, """'"'"'"''-"'"'·--·-··-··--···--·-·-.-··-···---···-····--·····---·--""""'"""""-·-·--··--···---------I
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MODEL 166
-0
OSCILLOSCOPE
FUNC
OUT
D
TTL
EXT
CH1 CH2
0 0
I
NOTE
Set scope to normal external trigger. Use alternate or chop vertical mode. Set scope time so
that one cycle just fills the screen. Using X 10
multip![cation Of cl_el~y time,. expa_flcl_ time by
10. Now each cm represents 1% difference in
symmetry.
Figure 5-4 Time Symmetry Calibration Setup
5-8
TRIG
6
SECTION
TROUBLESHOOTING
6.1
TROUBLESHOOTING GUIDES
INTRODUCTION
Power Amplifier
AM and Preamp
Waveform Switching
Hysteresis Switch
Capacitance Multiplier
VCG Current Source
Transition Time
Sweep Circuit
Familiarize yourself with the Model 166 by reviewing the
operating procedures as well as the circuit descriptions.
Successful fault isolation depends upon knowiedge of the
correct instrument operation. The physical arrangement of
the instrument and component listings are given in Section
7.
Table 6-1 lists six basic problem areas and possible causes
and corrections to problems in those areas.
6.2
PROBLEM AREAS
ACCESS
For access to the Power Supply board (-0645) and Main
board (-0628), remove the top cover. For access to the
Sweep and Transition Time board (-0629), remove the
bottom cover.
Power Supply
Output Waveform
Time Symmetry
Frequency Accuracy
Generator Mode
Sweep Circuit
6.3
Check points, expected values and component functions are
given in tables 6-2 through 6-10, the troubleshooting guides.
TEST EQUIPMENT
Test equipment are listed in paragraph 5.2.
Table 6-1. Troubleshooting
Definition
Problem
Possible Cause/Correction
POWER SUPPLY PROBLEM
1. AC line voltage is not
properly set.
1. Blown fuse
Measure the ac line voltage and check for proper selection of
line voltage in the unit. Refer to paragraph 2.2.1 for selection
procedure.
2. Short circuit if fuse blows
again after replacement.
13.
Fuse blows again or voltage
output at J 1 is not correct.
I
6-1
Table 6-1. Troubleshooting (Continued)
Definition
Problem
4.
Shortisnotfoundinthe
regulator.
i
1
Check for short circuit of transformer, power switch or defective CR1 - CR8, CR10 or CR11.
I Ch eek for short circuit between collector of 01, 05, 012 or
j
I
15. If voltage output at J1 is
normal, the short circuit is
in main board or sweep
board.
I
I
2. Power regulator
016 to chassis and also IC3.
I in most cases, short circuits in main board and sweep board do
I not cause blown fuses, unless the current limiting circuit in the
I power supply regulator has also failed. 03, 07, 011 and 015
I in power supply board are the current limiting device.
I
I
1. Unplug and check voltage at
J1 on power supply board.
If voltage is not normal, proceed to the followinq steps.
I2.
I
I
I
+5.2V is normal, but all
±12V, ±24V supplies are
abnormal.
Problem is in the +12 volt regulator; check for defective 01 04, IC1, CR9 and the associated circuitry.
3. Both -12V and -22V are
abnormal.
I
14.
I
Problem is in the -12V regulator; check for defective 09 012, IC4 and the associated circuitry.
Only +22V, -22V or +5.2V
is abnormal.
Check the regulator in which the output voltage is abnormal.
I
5. All regulator outputs are
abnormal.
3. Power supply
voltage below
normal
L
I"
Check line voltage and proper selection of line voltage. Refer
to paragraph 2.2.1 for line voltage selection.
I
Unplug and check voltage at
J1 on power supply board.
If voltage is normal, the
problem is in main circuit
board or sweep board. Otherwise, refer to power regulator
problem.
2. Both ±22V supplies below
normal.
Check ~or ~efective transformer and loose wiring in the primary c1rcu1t.
t Overloading the +12V supply wiii cause aii ±12V and ±22V
supplies to be low. Overloading the -12V supply will cause
the -22V supply to be low.
Isolate the power supply to the sweep board by unplugging J2
on sweep board.
Check for defective transistors 045 - 047 and 049 - 051 in
power amplifier.
OUTPUT WAVEFORM PROBLEM
1. No output waveform at FUNC
OUT and TTL
OUT
2. No output waveform at FUNC
OUT, but TTL
OUT is normal
6-2
Main generator is not running.
Ensure power supply voltages are normal and switches and
controls are set properly. Triangle amplifier, hysteresis switch
or current source is malfunctioning. Refer to troubleshooting tables 6-5, 6-6, and 6-8.
Problem in power amplifier, preamplifier or the AM circuit,
Refer to troubleshooting tables 6-2 and 6-3.
Definition
Problem
, / /3. No square waveform
at FUNC OUT
1. TTL OUT is normal, rii
is seen at TP8 on main board,
I
I2.
I
Check for defective 034, 035, CR43 - CR46 and associated
I circuitry,
I
1
TTL OUT is norma1, L
is not seen at TP8 on main
board.
Connector P15 is not plugged in.
Transition time circuit is malfunctioning; check 01 - 06 and
associated circuitry on sweep board.
Transition time amplifier is malfunctioning; check 07 - 010
on sweep board.
3.
rii output is normal, but
no pulse width control.
4. Also no TTL out. Check
for ± 2.2V ~ at emitter
of 022 to ensure the triangle
generator loop is functioning.
If not refer to tables 6-5,
6-6, and 6-8.
Check the continuity of the
square wave path to locate
the defective components.
Starting from main board
pins U and 13 of 1J11), to
'~
pins 14 and 15 of U11 1
through connector PIB,to
J16 on the sweep board.
Then on the sweep board,
pins 6 and 7 of U3, to pins
2 and 3 of U4 if 1.J is
selected, or pin 6 and 2 of
U5 if _n_ is selected.
Check pulse width circuit, U5 and 018 - 020 on sweep board.
1
1
1
1
1
-
4. No sine waveform
Al! other waveforms are normal. Check sine amplifier 038 and 039 on main board.
output
5. Distorted sine wave- 1. Time symmetry of ~ is
form below 100 kHz.
not 50% ± 0.5%.
2. Nonlinear or distorted "\; .
I
I
Square wave time symmetry is not calibrated correctly.
to TIME SYMMETRY PROBLEM.
I Refer
I
! If
II
the edge of the triangle is nonlinear at all frequency
ranges, troubleshoot the VCG current source circuit
(table 6-8).
Check for defective 015 and CR7 to
II of
the triangle is distorted, check for
1
3. Defective sine converter
4. Defective X-Y multiplier
circuit.
CR11. If the peak
defective range capa-
citators C22 to C31 .
Ij Check
for defective CR47 to CR61.
Check for defective U18, 052 and 053.
6-3
Problem
Definition
6. Sine distortion out o Usually square wave will show
specification at freup distorted or with slow rise/
quencies above 100
fall times.
Check preamplifier 054 - 063, or power amplifier 042 - 051.
Check for defective capacitors in the circuit.
kHz.
7. Transition time
problem.
Check transition time circuit, 01 - 06, on sweep board.
ICheck for defective U3, 021 - 023, on sweep board.
8. No TTL and TTL
output.
9. Excess of waveform
rol Ioff at high frequency
1. Excess rolloff shown at emitter of 063.
Check for defective C126, C127, C133, C135, C145 and other
frequency compensation components in this area, by connecting a capacitor in parallel with each capacitor.
2. Only sine waveform rolloff
excess.
C86 is open or C88 has wrong value on main board.
3. Otherwise.
Check for defective capacitor in the power amplifier.
10. Drooping on square
Check for defective C126 or C127 on main board.
wave ( ~ not
square)
11. Nonlinear triangle
Occurs at only one frequency
range.
waveform
I
Check for defective timing capacitors C22 - C31 of the associrange.
1ated
2. Occurs at all frequencies and
gets worse at bottom of frequency dial.
Check for defective 015 and CR7 - CR11.
TIME SYMMETRY PROBLEM
Waveform time
symmetry is off
and cannot be
calibrated to within specifications
1 . Al I frequencies.
I
Usually due to the malfunctioning of the VCG current source
circuit, U3 - U7, on main board. Check for leakage current at
gate of 02 - 05, 07, 09 and 011. check for excess source
current at input of U3 - U7.
2. Frequency ranges X 10 and
and below.
Capacitance multiplier is malfunctioning. Check for defective
U13 - U14 on main circuit board.
FREQUENCY ACCURACY PROBLEM
Frequency out of
specification
11. Out of specification at all
ranges.
I
II
I Mismatched dia! and potentiometer {R 1 ). Ensure that the
number on the back of the dial matches the number on the
potentiometer.
1
Check for defective components in the VCG current source,
Ul - U7 and 02 - 012 on main board.
I
,2.
I
6-4
Out of specification at
X 1OK range and up,
Check for defective components C35, C36, C39, C42 - C48,
C53, C68, R97 - R99, R109, R116 and R137 - R139 on the
main board.
I
Problem
Definition
I
I
3. Out of specification at
X .001 Hz to X 10M.
14. Frequency problem when
LOG is selected.
j
Check for defective U13- U14 and R185, R189 - R195 on
main board.
I
ICheck for defective U2 and 01 on main board.
!
GENERATOR MODE PROBLEM
1. Generator cannot be
triggered or gated
1. Trigger sweep mode is ok.
Check for defective 030 - 033, U 15, CR2 and the associated
circuitry on main board. Troubleshoot using figure 6-1.
2. Trigger sweep mode is not
operating.
Check for defective 026, 027 and the associated circuitry on
main board.
2. Triggered or gated
mode ok, but no
triggered haverwaveform
Check for defective SW2-B, CR42 and R 178 on main board.
3. No frequency sweep
-~·<-··"-'
1. No sweep signal at SWEEP
OUT.
Sweep circuit is malfunctioning. Check for defective U 1, U2,
U6, 011 - 017 on sweep board.
2. SWEEP OUT is normal.
Check for loose wire connection between sweep board and
main board.
ICheck for defective SW2-A on main board or R66 on sweep
board.
SWEEP CIRCUIT PROBLEM (Unless otherwise specified, components referred to are on the sweep board)
1. No signal at SWEEP
OUT
1. Sweep signal is seen at pin 6
I
Check for defective U2, CR28 and CR29.
of U1.
2. No sweep signal is seen at
pin 6 of U1.
2. Sweep signal runs
continuously at
TRIG SWP and
SWP HOLD
Sweep mode control logic
problem.
3. TRIG SWP and SWP
HOLD are not operating
1. Manual trigger switch has no
effect.
2. Cannot be triggered by MAN
TRIG or external signal at
TRIG IN.
IRefer to table 6-10.
ICheck for defective CR53 - CR60 and SW3-B.
Check for defective MAN TRIG switch and U9 on main board.
I Check for defective 026 and 027 on main board and 026 and
ICR55 - CR60 on sweep board.
I
6-5
Mode
Test Point
.............
···-············
Continuous
,.-···············------····-·-----·------·--·········-·--··--------·········---···--·-·---··-,-~--·----·---
Triggered
---·-----~----------
Gated Haversine
Gated
--~- -~--r~- -~-
TRIG IN
Pin 13, 15 of U10
ECL
Pin 15 of U12
ECL
Pin 9 of U15
ECL
Pin 15 of U15
ECL
L__ _J
L___
_Jl_______
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t-2.5V
Collector of 033
l..___...1...I_-_-- -'I
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0
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--u--
-u~
I..____
--u-uu-
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+2.5V
-2.5V
UlSLf1Jl_
+2.5V
-2.5V
LJLSlSlJl_ -1LJ--- ---I'LJl__JLJ- ~
Emitter of 019
+ 1.25V
--1.25V
~--Av-- ~A/v-- ~
·-···-·--··-·-··-·--------..----------·-·-----·-··· ----··-···-··-----------··----·-·- -·-···--------
-----.. ----·-···--·-"------------------·-----····-············-------------- - - - - - - - -
Figure 6-1. Generator Mode Timing Diagram
--------'---
Table 6-2. Power Amplifier Troubleshooting Guide
Observation
Test Point
Junction R279 and R281.
Power amplifier output: 0 to 30 Vp-p signal.
Junction C92 and C93
Summing juction: 0 V with less than 2 Vac transient.
Emitter of 063
Preamp output: 0 to 4 Vp-p signal, inverted from power amplifier output
040-043
De biasing circuit for power amplifier.
Base of 044 and emitter of
045
+19 Vdc.
Base of 048 and emitter of
049
-20 Vdc.
046 and 047
Slow rise time if one of the transistors is open
050 and 051
Slow fall time if one of the transistors is open
C92, C93, C96-C99, C109,
C110, R266-R268 and
R284-R286
These components affect the power amplifier frequency response the most.
Table 6-3. AM and Preamp Troubleshooting Guide
Test Point
Emitter of 063
I
I Preamp output:
Observation
0 - 3 Vp-p signal.
057-060
De bias circuit for the preamp.
Junction of C132 and C136
Summing junction, +1.8 Vdc typically.
Emitter of 061
+5.5 Vdc.
Emitter of 062
-5.5 Vdc.
C132-C137, C139-C140
and R351
I Frequency compensation components.
U18
AM modulator.
Pins 6 and 12 of U18
AM current output. Out of phase with each other.
054-056
I Current mirror circuit:
C126 and C127
I Excess drooping of square wave if defective.
Pins 2 and 3 of U18
Pin 10 of U18
I Differential signal input: -4.5 Vdc level.
IAmplitude control input: ±. 200 mV.
U16andU17
i Amplitude control amplifiers.
sums current from pin 12 to pin 6.
I
Table 6-4. Waveform Switching Troubleshooting Guide
Test Point
Observation
038 and 039
'\.; amplifier and switch.
036 and 037
"y ,,,/1 amplifier and switch.
034 and 035
~,
.± 1.5 V ~approximately
±0.5 v~.
Base of 037
Base of 038
± 1.25 v "v.
± 0.4V1'V approximately.
CR47-CR61
Sine converter diodes. Matched set.
L__Jl ,
WI amplifier and switch
6-7
Table 6-5. Triangle Amplifier Troubleshooting Guide
Test Point
Observation
Base of 015
± 1.25 V ~(input).
Emitter of 019
± 1.25 V "v (output).
Base of 016
-9 Vdc. ---·
RS6
For amplifier offset calibration.
015 and 017
Matched for V GS.
01S and 019
Matched for VBE. Excess offset between input and output of the amplifier may
be due to defective or mismatched 015 and 017, or 01S and 019.
017 sets the bias current for 015.
Table 6-6. Hysteresis Switch Troubleshooting Guide
Test Point
Observation
"v .
Junction of R 101 and R 136
± 1.25 v
Pint 1 of US
Negative peak detector input.
Pin 4 of US
Positive oeak detector inout.
Base of 023 and 024
+6 Vdc with 1.4
023
023 on (collector + 2V) when
"v going negative.
024
On/off cycle inverts from 023.
Emitter of 022
± 2.2
V~ .
"v
going positive. Off (collector - 2.5V) when
Emitter of 021
v ri .
2.5 Vp-p "v .
Pin 3 and 9 of US
-3 Vdc.
C70 and C42-C44
Negative peak compensation.
C45-C4S
Positive peak compensation.
C71, C6S, C70 and C48
Compensation for frequency above 10 MHz.
Table 6-7. Capacitance Multiplier Troubleshooting Guide
Capacitance multiplier
Used only at frequency ranges X.001 to X10.
+1.25V
Junction of R 195 and CSO
-1.25V
+7.5V
Pin 6 of U13
-7.5V
+3.75V
Pin 6 of U14 (Dial at 5)
-3.75V
+3.75V
Pin 6 of U14 (Varies with
Frequency)
-3.75V
6-8
Table 6-8. Current Source Troubleshooting Guide
Test Point
I
Observation
Pin 6 of U1
0 to -5.6 V. Varies with frequency.
Pin 6 of U3
0 to +5.6 V.
I +12 V (02 is on) except when
i av (02 is off).
Gate of 02
Pin 2 of U4
II
Pins 2 and 3 of U6
ramp waveform ( .// ) is selected; then voltage is
0 to 5.6 v. v·aries with frequency.
+12 to 7.3 V.
Emitter of 08
I Approximately 4 V below emitter of 06.
Pin 6 of U4
I Voltage equal or greater than voltage at Pin 3 of U6.
I Voltage equal or greater than voltage at S of 05.
Pin 6 of U6
Pin 2 of U5
0 v.
Pin 2 and 3 of U7
-12 V to -6.4 V.
Emitter of 010
I Approximately 4 V above emitter of 012.
U2 and 01
Log converter. Used in log frequency only.
Emitter of 024
+7.5 Vdc.
Base of 013
± 1.2V pulse.
Pins 9 and 13 of U6
1
OV in CONT SWP.
I Trigger sweep control input buffer amplifier.
I Sweep mode control logic.
026
CR53-CR60
Table 6-9. Transition Time Troubleshooting Guide
Note: All components are on the sweep board
Test Point
Observation
Junctions of C1 and C2, C11
and C12
Square wave (ECL level) input to the transition time generator.
01 and 04
Leading edge current switch.
02 and 05
Trailing edge current switch.
CR3-CR6
Peak level clamp.
07-010
Unity gain amplifier. Output (emitter of 09) is± 1.2 V pulse.
Table 6-10. Sweep Circuit Troubleshooting Guide
Note: Unless otherwise noted, the sweep generator is set to CONT SWP and SWEEP TIME to 10 ms. All components are
on the sweep board.
Test Point
Observation
Base of 011
+6 Vdc.
Emitter of 014
+6 Vdc.
Pins 3 and 6 of U1
-0.2 to +5.5 V ramp.
Pin 3 of U2
0 to +5 V ramp.
012 and 013
, 012 is off and 013 is on during ramp up t;me. 012 is on and 013 :s off ·,;vher. ramp
resets.
015
Reset current is discharged through the collector-base junction of 015.
016and017
In TRIG SWP mode, 016 and 017 hold the quiescent voltage of the ramp at pin 3 of U1 to
-200 mV, which ensures CR29 is reverse biased and output at U2 is OV.
P 2 of U6
0 V peak detector input.
Pin 6 of U6
+5V peak detector input.
6-9
1
SECTION
PARTS AND SCHEMATICS
7.1 DRAWINGS
7.3 ADDENDA
The following assembly drawings, parts lists and schematics
are in the arrangement shown below.
Under Wavetek's product improvement program, the latest
electronic designs and circuits are incorporated into each
Wavetek instrument as quickly as development and testing
permit. Because of the time needed to compose and print
instruction manuals, it is not always possible to include the
most recent changes in the initial printing. Whenever this
occurs, addendum pages are prepared to summarize the
changes made and are inserted immediately inside the cover.
7.2 ORDERING PARTS
When ordering spare parts, please specify part number,
circuit reference, board, serial number of unit and the
function performed.
Drawing No.
Drawing
Instrument Schematic
Chassis Assembly
Chassis Parts List
0004-00-0128
0102-00-0649
11 01-00-0649
Main
Main
Main
Main
0103-00-0628
0101-00-0628
1100-00-0628
1202-00-0041
Board
Board
Board
Board
Schematic
Assembly
Parts List
Switch Assemblies
Shi·eld Board Assembly
Shield Board Parts List
0101-00-0684
11 00-00-0684
Drawing
Drawing No.
Sweep and Transit Time
Board Schematic
Board Assembly
Board Parts List
Board Switch Assemblies
0103-00-0629
Power Supply Schematic
Power Supply Assembly
Power Supply Parts List
0103-00-0645
0101-00-0645
1100-00-0645
Rear Panel Assembly
Rear Panel Parts List
0102-00-0648
1206-00-0648
0101-00-0629
11 00-00-0629
1202-00-0042
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PARTS LIST
PAGE I
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1509•80•0008
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ASSEMBLY NO.
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MAINTENANCE WITHOUT WRITTEN AUTHORIZATION-
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REFEl<ENCE DESIGNATOl<S
PART
DESCRJPT
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REFERENCE DESIGNATORS
PART DESCR!PT!DN
21
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