SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-4931-427-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.

This bulletin provides instructions for the

calibration of Frequency Difference Meter, Tracor Models 527A and 527E and Hickok

Model FDM 2100. The manufacturers' manuals were used as the prime data sources in

compiling these instructions. The equipment being calibrated will be referred to as the TI

(test instrument) throughout this bulletin.

a. Model Variations. The Tracor Model 527E Frequency Difference Meter has a front

panel phase meter instead of the cathode ray tube used on the Tracor Model 527A and

Hickok Model FDM 2100. Information shown in parenthesis is for Hickok Model FDM

2100. Other variations among models are described in text.

b. Time and Technique. The time required for this calibration is approximately 2

hours, using the dc and low frequency technique.

2. Forms, Records, and Reports.

a. Forms, records, and reports required for calibration personnel at all levels are

prescribed by TB 750-25.

b. Adjustments to be reported are designated (R) at the end of the sentence in which

they appear. When adjustments are in tables, the (R) will follow the designated

adjustment. Report only those adjustments made and designated with (R).

3. Calibration Description. TI parameters and performance specifications which

pertain to these calibrations are listed in table 1.

Table 1. Calibration Description

Test instrument parameters

Performance specifications

Input

Frequency: 100 kHz to 5 MHz

Voltage: 0.5 to 10 V rms

Frequency difference meter

Range: -10 to +10 parts in 107, 108, 109, 1010, or 1011

Accuracy: 5% of full scale