Section III. PRELIMINARY OPERATIONS

TB 55-4920-389-34

When necessary, these items may be substituted by equivalent items unless specifically prohibited.

Table 2-2. Accessories Required

Accessory Identification1

Item

Common Name

Test Lead

30-in., lead No. 10 AWG with spade lug

terminal to pin tip terminal (red)

Test Lead

30-in., lead No. 10 AWG with spade lug

terminal to pin tip terminal (black)

See footnote under table 2-1.

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 number

prefixed with A, see table 2-1; and for prefix B, see table 2-2.

3-2. Equipment Setup.

WARNING

HIGH ELECTRICAL CURRENT is utilized within the Test Instrument during performance

of this procedure. OBSERVE UUT start and stop procedures pertinent to the Test

Instrument being calibrated to prevent possible damage to equipment and/or injury to

personnel.

a. Adjust the test instrument tachometer indicator and AC ammeter for mechanical zero by means of screw

driver slot located at lower front of indicator.

b. Set test instrument SPEED ADJUST controls both in the fully counterclockwise (CCW) position.

Set test instrument DRIVE ROTATION switch to clockwise (CW) position.

d. Mark test instrument generator center drive shaft with a piece of black tape.