Section III. PRELIMINARY OPERATIONS

TB 55-6625-726-35

Section III. PRELIMINARY OPERATIONS

3-1.

Preliminary Instructions.

a. The instructions outlined in this section are preparatory to the calibration process. Personnel should become

familiar with the entire bulletin before beginning the calibration.

b. Items of equipment used in this procedure are referenced within the text by common name and item identification

number as listed in tables 2-1 and 2-2. For the identification of equipment referenced by item numbers prefixed with A,

see table 2-1 and for prefix B, see table 2-2.

WARNING

HIGH VOLTAGE is used during the performance of this calibration.

DEATH ON CONTACT may result if personnel fail to observe safety

precautions.

3-2.

Equipment Setup.

a. Adjust mechanical zero-adjustments on test instrument meters for zero (0).

b. Set red pointer on test instrument meter to the index mark on the right side of scale.

Position test instrument controls as listed in (1) through (3) below:

(1)

COMPENSATOR switch to OFF.

(2)

RANGE SELECTOR switch to OFF.

(3)

VOLTAGE CONTROL to zero.

d. Set test instrument POWER switch to ON and allow time for equipment to warm up and stabilize.

Section IV. CALIBRATION PROCESS

NOTE

Unless otherwise specified, verify the results of each

test and take corrective action whenever the test

requirement is not met before continuing with the

calibration.

4-1.

AC Voltmeter (Low Range).

a. Performance Check.

(1)

Connect differential multimeter (Al) to test instrument as shown in figure 4-1.