SECTION III CALIBRATION PROCESS

TB 9-4920-360-35

Table 2. Minimum Specifications of Equipment Required

Minimum use

Manufacturer and model

Common name

specifications

(part number)

AUTOTRANSFORMER Range: 105 to 125 V ac

General Radio, Model

W10MT3AS3 (7910809)

Accuracy:

FREQUENCY

Range: 250 to 5531 Hz

Fluke, Model PM6681/656

0.05%

COUNTER

(PM6681/656)

Accuracy:

MULTIMETER

Range: 16.140 to 33.523 mV dc

Hewlett-Packard, Model 3458A

1.5%

(3458A)

Accuracy:

Range: 15 to 30 C

THERMOMETER

zonix, Model A1012

A IS38958)

1.5

Accuracy:

SECTION III

CALIBRATION PROCESS

6. Preliminary Instructions

a. The instructions outlined in paragraphs 6 and 7 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 as listed in table 2.

c. Unless otherwise specified, verify the result of each test and, whenever the test

requirement is not met, take corrective action before continuing with the calibration.

Adjustments required to calibrate the TI are included in this procedure. Additional

maintenance information is contained in manufacturer's manual for this TI.

d. Unless otherwise specified, all controls and control settings refer to the TI.

7. Equipment Setup

WARNING

HIGH VOLTAGE is used or exposed during the performance of

this calibration. DEATH ON CONTACT may result if

personnel fail to observe safety precautions.

REDUCE

OUTPUT(S) to minimum after each step within the

performance check where applicable.

a. Position controls as listed in (1) through (4) below:

(1) POWER switch to OFF.

(2) FUNCTION SWITCH to 0%.

(3) VAR FREQ ADJ switch to 0.