TB 9-6625-2050-24
(9) Adjust oscilloscope and range calibrator controls to superimpose waveforms as
shown in figure 4, using procedure in (a) through (d) below.
(a) Establish a horizontal grid line as dc average of test point A4TP4 (fig. 2) by
setting range calibrator FUNCTION switch to STANDBY.
(b) Position CH 1 trace on the line.
(c) Set range calibrator FUNCTION switch to CALIBRATE.
(d) Press oscilloscope X10 MAG button to activate.
Figure 4. Zero crossover waveform.
(10) Adjust A4R76 (fig. 2) until zero crossover lags the square wave 150 s (R).
(11) Repeat (3) above.
(12) Position A4R46 (fig. 2) to its mechanical center position.
(13) Adjust A4R32 (fig. 2) until multimeter indicates 0 0.2 mV dc (R).
(14) Set range calibrator FUNCTION switch to CALIBRATE and TI range
to 1 mW.
(15) Adjust CAL ADJ until multimeter indicates 1,000 +1 mV dc.
(16) Adjust A4R35 (fig. 2) until TI meter indicates full scale (R).
(17) Set range calibrator to STANDBY.
(18) Set RANGE switch to 3 W and press and hold ZERO switch. Adjust A4R42
(fig. 2) until multimeter indicates 0 mV dc (R). Release ZERO switch.
(19) Set TI RANGE switch to 1 mW.
(20) Set range calibrator FUNCTION switch to CALIBRATE.
(21) Press and hold ZERO switch. Adjust A4R46 (fig. 2) until multimeter indicates
961 mV dc (R). Release ZERO switch.
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