SECTION II CALIBRATION

SECTION II

CALIBRATION

5. Equipment Required

to assist in the selection of alternate

Equipment required for calibration performance checks

equipment which may be used at the

and adjustments is listed in table 1.

discretion of the calibrating activity.

Satisfactory performance of alternate

NOTE

items shall be verified prior to use.

Minimum use specifications are the

All applicable equipment must bear

principal parameters required for

evidence of current calibration.

performance of the calibration and

are included

Table 1A. Equipment Required

Item

Minimum use specification

Calibration equipment

Military equivalent

Frequency counter ......... Frequency range, 1 to 157 MHz............................... Systron-Donner model

AN/USM-257A

Accuracy, ±1 percent.

1037.

Vhf signal generator........ Frequency range, 130 MHz...................................... Hewlett-Packard model

AN/URM-52B

Accuracy, ±0.5 percent.

608E.

Rf voltmeter.................... Voltage range, 0 to 400 microvolts........................... Boonton PICA....................

AN/URM-145

Accuracy, ± 3 percent.

Sweep signal generator

Swept frequency range, 0.5 to 460 MHz................... Telonic Instruments.

AN/USM-308 (V)

Sweep width, 200 kHz to 200 MHz

Model SM-2000

or any one of the

Output voltage; sweep I volt peak to peak, cw 0.5

with SH-1 plug-in

following:

volt peak to peak.

sweep oscillator.

AN/USht-219,

Flatness, ±1.0 db.

AN/USM-220,

AN/USM-221.

Oscilloscope...................

Frequency range, 0 to 50 MHz................................. Hewlett-Packard

OS- 1 88/U

Sensitivity, 0.005 volt per division to 20 volts

180 series with

per division.

1801 F vertical

Rise time, less than 7 nanoseconds.

amplifier and 1821F

Sweep range, 0.1 microseconds per division to 2

time base plt-g-in

seconds per division.

accessories.

Detector.......................... Input impedance, 50 ohms........................................ Telonic XD-8A....................

RF-235/U

Frequency range, 0.5 to 300 MHz.

VSWR, less than 1.2: 1.

Type of deflection, half-wave voltage doubler.

Output polarity, positive.

Dc voltmeter .................. 0-24 volts, dc............................................................. John Fluke 803B ............... ME-202/U

Accuracy, + 3 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.

Table 1B. Authorized Accessories.

unit under test for the calibration procedures outlined in

paragraphs 7, 8, 9, and 10. These preliminary operating

Nomenclature

Description

procedures place the power supplies (1A3PSI through

Adapter..............................

BNC to T. Pomona 3288.

(A3PS2), RF oscillators (1A1A1 through 1A1A43), vhf

Adapter.............................1

BNC to T. Pomona 3285.

amplifier 1A2AR2 and frequency doubler (1A2AR3) in

RF Cable Assembly W118 ,

BNC plug to BNC plug.

the unit under test in a turned-on condition.

W119, W120, W121,

NOTE

W122, W123.

Unless otherwise specified, verify the

Extender Circuit Card............ Printed circuit card, Litcom

results of each step and take

part No. 2001721 - 1.

corrective action whenever the

Cables are provided as part of the unit finder test and

requirement is not met, before

are stored in the utility drawer. Assure that these cables

proceeding.

are returned to the utility drawer after use.

a. Operate unit under test power supply panel

NOTE

(1A3) MAINS switch to ON. Observe that MAINS

It is recommended that personnel

indicator illuminates and blower motor operates. Also

familiarize themselves with the entire

observe that-9 VDC and 18 VDC indicators illuminate.

procedure

before

performing

calibration.

6. Preliminary Procedure

This section includes instructions to prepare the