TB 9-6625-2102-24
Table 12. Symmetry @ 200 kHz
Oscilloscope duty cycle
indications
(%)
Min
Max
49.5
50.5
(5) Adjust frequency dial to .02.
(6) Adjust main generator FREQ MULT (Hz) VERNIER control for an oscilloscope
frequency measurement of 400 Hz.
(7) If oscilloscope does not indicate within duty cycle limits in table 13, perform
b (2) below.
Table 13. Symmetry @ 400Hz
Oscilloscope duty cycle
indications
(%)
Min
Max
45
55
b. Adjustments
(1) Adjust R36 (fig. 2) until oscilloscope indicates a duty cycle between 49.5% and 50.5% (R).
NOTE
R36 is effective on positive portion of square wave.
(2) Adjust R23 (fig. 2) until oscilloscope indicates a duty cycle between 45% and 55% (R).
NOTE
R23 is effective on negative portion of square wave.
(3) Repeat this performance check and adjustment procedure as necessary for a best
in-tolerance condition.
Figure 2. Test instrument - bottom view.
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