SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-6625-1873-50

SECTION I

IDENTIFICATION AND DESCRIPTION

This bulletin provides instructions for the

1. Test Instrument Identification.

calibration of Impedance Matching Transformer, Anzac Electronics Company, Models TP-

75 and TP-93. The manufacturer's manual was used as the prime data source in compiling

these instructions. The impedance matching transformer will be referred to as the "test

instrument" throughout this bulletin.

a. Model Variations. Variations among models are described in text.

b. Time and Technique. The time required for this calibration is approximately 1

hour, using the microwave technique.

2. Calibration Data Card (DA Form 2416). Maintenance forms, records, and reports

which are to be used by calibration personnel at all calibration levels are listed in and

prescribed by TM 38-750.

3. Calibration Description.

Test instrument parameters

and

performance

specifications which pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test Instrument Parameters

Performance Specifications

VSWR

Less than 1.2 to 1 from 100 to 200 MHz.

Insertion loss

Less than 0.25 db (0.4 db for TP-93) from 1 to 200 MHz.

Impedance

Input, 50 ohms. Output, 75 ohms for TP75 and 93 ohms for TP-93.

SECTION II

EQUIPMENT REQUIREMENTS

4. Equipment Required. Table 2 identifies the specific equipment used in this

calibration procedure. This equipment is issued with secondary transfer calibration

standards set 4931-621-7877 and is to be used in performing this procedure. Alternate

items may be used by the calibrating activity when the equipment listed in table 2 is not

available. The items selected must be verified to perform satisfactorily prior to use and

bear evidence of current calibration. The equipment must meet or exceed the minimum use

specifications listed in table 2. The accuracies listed in table 2 provide a four-to-one

accuracy ratio between the standard and test instrument. Where the four-to-one ratio

cannot be met the actual accuracy of the equipment selected is shown in parenthesis.

5. Accessories Required. The accessories listed in table 3 are issued with secondary

transfer calibration standards set 4931-621-7877 and are to be used in this calibration

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

specifically prohibited.