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(2) If the dc voltmeter does not indicate between -17.98 and -18.02 volts dc, perform
b below.
(3) Vary the output of autotransformer (A1) between 105 and 125 volts ac. The dc
voltmeter 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. 3) for model 431C or R13 (fig. 2) for model 431B.
14. Final Procedure
a. Deenergize and disconnect all equipment and replace TI protective cover.
b. When all parameters are within tolerance, annotate and affix DA Label 80 (US
Army Calibrated Instrument).
annotate and affix DA Label 163 (US Army Limited or Special Calibration). When the TI
cannot be adjusted within tolerance, repair the TI in accordance with the maintenance
manual. When repair is delayed for any reason or the TI cannot be repaired with local
resources, annotate and affix DA Form 2417 (US Army Calibration System Rejected
Instrument) and inform the owner/user accordingly in accordance with TB 750-25.
When the TI receives limited or special calibration,
TB 9-6625-086-35
13
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