TB 9-6625-1943-24
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
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286; AN/GMS-287; or AN/GSM-705. 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
calibration procedure.
