TB 11-6625-247-35
b. Specifications
Frequency meter:
Range
360 to 440 Hz
1%
Accuracy
Milliammeter:
Range:
0 to 1.6 mA
Accuracy
3% of full scale
c. Calibration
Time required
1.5 hours (approx.)
Technique
DC-Low Frequency
Interval
In accordance with TB 43-180
1-4.
General Instructions
a. Calibration Reporting. During the performance of this procedure, annotate DA
Form 2416 (Calibration Data Card) in accordance with TM 38-750.
as the test instrument.
SECTION II
EQUIPMENT REQUIREMENTS
NOTE
Minimum use specifications are the principal parameters
required for performance of the calibration, and are included to
assist in the selection of alternate equipment, which may be
used at the discretion of the calibrating activity. Satisfactory
performance of alternate items shall be verified prior to use.
All applicable equipment must bear evidence of current
calibration.
2-1.
listed in table 1. Secondary transfer standards identifying numbers are shown in
parentheses in the calibration equipment column.
Table 1. Equipment Required
Item No.
Common name
Minimum use specifications
Calibration equipment
A1
Audio oscillator
Range: 376.2 Hz to 424.2 Hz
Audio Oscillator TS-421C/U (8616377)
Accuracy: 2%
A2
Electronic voltmeter
Range: 47 Vac to 153 Vac
Electronic Voltmeter ME-202A/U
(7912.06)
Accuracy: 0.2%
A3
Counter
Range: 376.2 to 424.2 Hz
Digital Readout Electronic Counter
AN/USM-207A (7910823)
3
