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Oscillator Frequency

Calibration Procedure For Power Meter, Model 431C (An/Usm-260) Page Navigation
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TB 9-6625-086-24
13. Power Supply
a. Performance Check
NOTE
Do not perform the power supply check if all other parameters
are within tolerance.
(1) Connect multimeter to pin W of terminal board XA2 (fig. 4) and ground.
Figure 4. Top internal view.
(2) If the multimeter does not indicate between -17.98 and -18.02 volts dc, perform
b below.
(3) Vary the output of autotransformer between 105 and 125 volts ac.
The
multimeter indication will remain within the limits specified in (2) above.
(4) Adjust the autotransformer for a 115 volt ac output.
b. Adjustments. Adjust R36 (fig. 2).
14. Final Procedure
a. Deenergize and disconnect all equipment and replace TI protective cover.
b. Annotate and affix DA label/form in accordance with TB 750-25.
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