Wavetek 182A Instruction Manual page 26

Indication: Sine waveform problem.
1. Set controls to initial positions (refer to paragraph 6.4).
2.
Check emitter 01 for a 4 kHz,
3. Verify that the ± 1 .25V triangle peaks at the emitter of 01 agree within 3%.
4. Select triangle function; check for
5. Select sine function; check for
6. Check sine distortion 500 OUT (HI) per calibration procedure (refer to
table 5.1).
7. Check sine amplitude vs frequency per specifications (refer to section 1).
Indication: Square waveform problem.
1. Set controls to initial positions (refer to paragraph 6.4).
2. Check CR1 0 cathode for a 4 kHz, approximately
3. Select a triangle function; check U13 pin 10 for a
4. Select square function; check U13 pin 10 for a
5. Check square wave at 500 OUT (HI) for the same 20V p-p (open circuit)
amplitude as the triangle and sine.
6. Check riselfall times of 4 MHz square (500 terminated) for
Indication: TTL sync output problem.
1. Set controls to initial positions (refer to paragraph 6.4).
2. Check U8 pin 1 for a TIL
3. Check US pin S for a TIL
4. Check SYNC OUT
TIL.
5 . Check SYNC OUT waveform at 4 MHz, using a
6000 resistive termination and
2:
6-4
6·4.
Table Sine Conversion
Check
± 1.25V triangle.
± 1 .25V triangle at U 13 pin 10.
1.25V sine at U13 pin 10.
±
6·5.
Table Square Function
Check
± 2V square wave.
± 1.25V triangle.
± 1.25V square.
6·6.
Table TTL Sync Output
Check
level, 4 kHz square.
level, 4 kHz square.
load termination or a
TIL
3 foot RG5SU coax.
:5
If
Faulty,
Check for normal operation.
Go to table 6-2.
a. R62, R63, R64, R65,
R67, R6S, R69 R70
b. CR7, CRS, U7.
c. 15V supplies.
±
Go to table 6-3, step 3.
a. U12 circuitry.
b. SW12.
a. R97, R114 adjustments.
b. Waveform symmetry, R45
adjustment and table 6-S.
c. U12 circuitry.
C47, C55, C56, C57
If
Faulty,
Check for normal operation.
Go to table 6-2.
Go to table 6-3.
a. 012, 013 circuitry.
b. SW14.
R106, R110, R111.
50 ns. C51, C55, C56, C57.
<
If Faulty, Check
Check for normal operation.
Go to table 6-2.
a. US.
b. CR11, CR12.
E27, E2S, E19 wiring.
a. US.
b. E19 ground connection.
Check
Check