SECTION II CALIBRATION

SECTION II

CALIBRATION

5. Equipment Required. Equipment required for calibration performance checks and adjustment is listed in table 1.

NOTE

Minimum use specifications are the principal parameters required for performance of the

calibration and are included to assist in the selection of alternate equipment which may be used

at the discretion of the calibrating activity. Satisfactory performance of alternate items shall be

verified prior to use. All applicable equipment must bear evidence of current calibration.

Table 1. Equipment Required

Minimum use

Calibration

Military

Item

specification

equipment

equivalent

DC Voltmeter ............. 18 Volts, dc

John Fluke

ME-202/U

accuracy ± 1

Model 803B

percent

The calibration equipment utilized in this procedure was selected from those known to be available at Department of

Defense facilities. and the listing by make or model number carries no implication of preference, recommendation, or

approval by the Department of Defense for use by other agencies. It is recognized that equivalent equipment produced

by other manufacturers may be capable of equally satisfactory performance in the procedure.

NOTE

The following paragraph is divided

It is recommended that personnel

into subparagraph a, performance

familiarize themselves with the entire

check,

and

subparagraph

procedure

before

performing

adjustments. When the performance

calibration.

check is within tolerance do not

perform

the

corresponding

6. Preliminary Procedure. This section includes

adjustment. When the performance

instructions to prepare the unit under test for the

check is not within tolerance,

calibration procedures outlined in paragraph 7. The

perform

the

corresponding

preliminary operating procedure places the power

adjustment before continuing with

supplies (PS1 and PS2) in the unit under test in a

the calibration procedure. When the

turned-on condition. Verify the results of the following

performance check is not within

turn-on and take corrective action if the requirements

tolerance and the adjustment cannot

are not met, before proceeding.

bring it into tolerance, the deficiency

must be corrected before continuing

a. Operate unit under test 1 KHz and AF FREQ

with the procedure.

switches to OFF.

7. Power Supplies PS1 and PS2 Calibration.

b. Disregard settings of remaining switches and

controls.

a. Performance Check.

c. Operate POWER switch to ON.

(1) Connect dc voltmeter to test points on unit

under test front panel as noted in table 2.

d. Observe that POWER indicator illuminates and

fan motor operates.

(2) Observe that dc voltmeter indicates within

the limits specified in table 2.

Table 2. Power Supply Output Voltages

Dc voltmeter indication

Unit under test

(volts de)

Front panel

Power supply

test points

Minimum

Maximum

PS1 ............................. +18 VDC and GND ............................... +175 ......................................... +1K5

PS2 ............................. -18 VDC and GND ................................ -17.5 ......................................... -18