Wavetek 182A, Инструкция по эксплуатации

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Table
6·8.
Symmetry
Indication: Waveform symmetry problem.
Check
1. Set controls to initial positions (refer to paragraph 6.4).
2. If symmetry problem appears on x 1, X 10, X 100 ranges only, problem
may be R90 adjustment or go to table 6-9.
If Faulty, Check
Check for normal operation.
3. Perform steps 5 through 12 of table 6-7, then return to this table. a. R49 adjustment.
b. R44, adjustment.
4. Verify RUN signal at cathode CR6 is approximately + 3.5V.
Go to table 6-10.
5. Verify U6 pin 4 and U6 pin 15 vary from approximately -1 OV to -15V as
U1, U6, R52, R53.
dial is rotated from 4.0 to .004.
6. Verify amplitude of SOR signal at cathode CR10 is approximately ± 2V.
a. 07 circuit.
7. Check U5, CR6.
Table
6·9.
Capacitance Multiplier
Indication: Problem on bottom frequency ranges only.
Check
1. Set controls to initial positions (refer to paragraph 6.4).
b. U7 circuit.
c. + 5V supply.
If Faulty, Check
Check for normal operation
on
X
1
K
range.
2. Check for 0 Vdc at U11 pins 2 and 6. SW2 - SW4.
3. Check for approximately 0 Vdc at U11 pin 12.
U11 circuitry.
4. Check for 0 Vdc
±
5 mV at U 11 pin 10. a. R90 adjustment.
b. U11 circuitry.
5. Select
X
100 range; check U11 pin 10 for heavy oscillations. C46, U11.
6. Check that the signal at U11 pin 2 is amplified by approximately 6 at pin 12
U11 circuitry.
(within saturation limits).
7. Check for the same signal at U11 pins 6 and 7 as at the emitter of 011.
SW4, U11 circuitry.
8. Ensure that R93 and R94 are shorted in the
x
100 range.
SW4.
9. Check 400 Hz frequency (4.0 x 100).
a. R86 adjustment.
b. R89, R95, C45.
10. Check 40 Hz frequency (4.0
X
10). R93, SW3.
11. Check 4 Hz frequency (4.0 x 1).
R94.
12. Check symmetry at 0.2 x 100; ensure triangle is linear.
a. R90 adjustment.
6-6
b. U11.
c. Leaky C30, C36, C45, C46,
CR6. U5. 09.