SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-6625-1943-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification. This bulletin provides instructions for the

calibration of Frequency Meter, American Machine and Foundry Co., Model PFM 604B,

A and M Instrument, Inc., Model 5009 and Sun Electric Corp., Model M7-110. The

manufacturers' manuals were used as the prime data source in compiling these

instructions. The equipment being calibrated will be referred to as the TI (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 dc and low frequency technique.

2. Forms, Records, and Reports. Forms, records, and reports required for

calibration personnel at all levels are prescribed by TB 750-25.

3. Calibration Description. TI parameters and performance specifications which

pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test instrument parameters

Performance specifications

Input voltage

105 to 135 V ac

Input frequency

60 and 400 Hz

Meter scales

58 to 62 Hz and 380 to 420 Hz

Resolution

0.1 Hz (58 to 62 Hz) and 1 Hz (380 to 420 Hz)

Meter accuracy:

Center scale

0.1%

Entire scale

0.2%

EQUIPMENT REQUIREMENTS

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

calibration procedure. This equipment is issued with Secondary Transfer Calibration

Standards Set AN/GSM-286. Alternate items may be used by the calibrating activity.

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

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

specifications listed in table 2.

5. Accessories Required. The accessories required for this calibration are common

usage accessories issued as indicated in paragraph 4 above and are not listed in this

calibration procedure.