TB 9-6625-2102-24
(6) Adjust R93 (fig. 1) until audio analyzer indicates between 960 and 1000 Hz (R).
(7) Disconnect TI from audio analyzer and connect to oscilloscope Vertical 1 input.
(8) Set up oscilloscope to measure duty cycle.
(9) Set FREQ/PERIOD MULT (Hz/s) switch to 10/1K and adjust VARIABLE
control fully cw.
(10) Adjust R14 (fig. 1) until the oscilloscope indicates a duty cycle between 49 and 51% (R).
(11) Adjust VARIABLE control fully ccw.
(12) Adjust R17 (fig. 1) until the oscilloscope indicates a duty cycle between 49 and 51% (R).
(13) Set FREQ/PERIOD MULT (Hz/s) switch to 1K/100K.
(14) Adjust R75 (fig. 1) until the oscilloscope indicates a duty cycle between 49 and 51%.
(15) Repeat this adjustment procedure for best in-tolerance condition on all ranges.
9. Modulation Generator Zero
a. Performance Check
(1) Connect MODULATION GENERATOR OUT (600:) to audio analyzer
INPUT HIGH.
(2) Set up audio analyzer as listed in (a) through (d) below:
INIT.
(a)
SPCL 17 (slow detector).
(b)
LEVEL.
(c)
Enable DC (low-pass filter).
(d)
(3) Set FREQ/PERIOD MULT (Hz/s) switch to 10/1K and adjust VARIABLE
control fully cw.
.
(4) Set TI MODULATION GENERATOR FUNCTION switch to
If audio
analyzer does not indicate within limits in table 6, perform b (l) below.
Table 6. Triangle Wave Zero
Audio analyzer indications
(DC V)
Min
Max
- 0.010
+ 0.010
(5) Set MODULATION GENERATOR FUNCTION switch to
.
If audio
analyzer does not indicate within limits in table 7, perform b (2) below.
Table 7. Square Wave Zero
Audio analyzer indications
(DC V)
Min
Max
- 0.010
+ 0.010