TB 9-6625-2146-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Ac and Dc Voltmeters and Ac and Dc Ammeters listed in table 1. The
manufacturers' manuals and/or TM's 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. Variations among models are listed in the text.
b. Time and Technique. The time required for each calibration is approximately 1
hour, using the dc/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) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument
Manufacturer and model
Parameters
Performance specifications
General Electric, Model AK-4
Ac volts
Range:
0 to 750 V
Accuracy: r3% FS at 60 Hz
Ac amps
Range:
0 to 800 A
Accuracy: r 3% FS at 60 Hz
Sensitive Research Instrument
Dc milliamps
Range:
0 to 100 mA
Corporation (SRI), Model C-CILKI
Accuracy: r 0.25% of FS
(horizontal position)
Sensitive Research Instrument
Dc amps
Range:
0 to 30 A
Corporation (SRI), Model C-CILORD
Accuracy: r0.25% of FS
(horizontal position)
ME-221/U
Dc milliamps
Range:
0 to 500 mA
(horizontal position)
Accuracy:
r 0.5% of FS
ME-489/U
Ac volts
Range:
0 to 150, 300, 600 V
(clamp-on ammeter)
Accuracy:
r3% of FS at 50 or 60 Hz
Ac amps
Range:
0 to 6, 15, 60, 150, 300 A
Accuracy:
r3% of FS at 50 or 60 Hz
ME-65/U and ME-65A/U
Ac amps
Range:
0 to 200 A
(horizontal position)
Accuracy:
r 0.5% of FS, 20 to 500 Hz
Westinghouse, Model PA-5
Ac amps
Range:
0 to 200 A
(horizontal position)
Accuracy:
r 0.5% of FS, 20 to 135 Hz
Westinghouse, Model PY-4
Ac volts
Range:
0 to 450 V
Style 936-368 (horizontal position)
Accuracy:
r 0.75% of FS, 5 to 200 Hz
