TB 9-6625-1200-24
b. Adjustments
(1) Adjust oscilloscope calibrator variable control for a 0.0 indication on Err
readout. Record the amplitude of waveform on TI.
(2) Set TI VOLTS/DIV switch to CALIBRATE 4 DIVISIONS and adjust R780 (fig.
2) for value recorded in (1) above (R).
14. Power Supply
a. Performance Check
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
(1) Position controls as listed in (a) through (c) below:
(a) TIME/DIV switch to 1 mSEC.
(b) INTENSITY control maximum ccw.
(c) TRIGGERING LEVEL control ccw, but not to AUTO.
(2) Connect multimeter to -12V test point (fig. 3) and chassis ground, using lead. If
multimeter does not indicate between -11.88 and -12.12 V, perform b below.
b. Adjustments
(1) Adjust R639 or (R1130 ON AC-DC POWER SUPPLY) (fig. 4) until multimeter
indicates -12 V (R).
(2) Reinstall protective cover on TI.
Figure 4. Test instrument - interior view.