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Test Set Mark 127 MOD 4
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Voltage and Leakage Meter Circuit



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MIL-T-21369C(OS)
3.3 Performance requirements and product characteristics. The Test Set Mark 127 Mod 4 shall
meet the following performance requirements and product characteristics.
3.3.1 Calibration requirements.
3.3.1.1 Power supply circuit calibration. After the power supply circuit has been calibrated in
accordance with 3.5.1, there shall be a potential of 510  10 volts between the positive (+) jack
P6, and the negative (-) jack P7, when the test set is connected to a 115 volt AC supply and
the ON-OFF switch is at the ON position for at least 15 minutes.
3.3.1.2 Time delay circuits calibration.
33.1.2.1 Five-second timing delay circuit calibration. After the five-second timing delay circuit
has been calibrated in accordance with 3.5.2.1, the five-second timing delay shall operate 5  0.25
seconds after the START switch is depressed.
3.3.1.2.2 One-second timing delay circuit calibration. After the one-second timing delay circuit
has been calibrated in accordance with 3.5.2.2 the one-second timing delay shall operate 1  0.1
second after the START switch is depressed
3.3.1.3
VOLTAGE AND LEAKAGE meter calibration.
After the VOLTAGE AND
LEAKAGE meter has been calibrated in accordance with 3.5.3, the test shall successfully meet all
requirements of 3.3.2.1 and 3.3.2.1
3.3.2.1 Battery insulation resistance After the VOLTAGE AND LEAKAGE meter has been
calibrated in accordance with 3.5.3, the test set shall measure battery insulation resistance with an
accuracy of  5 percent.
3.3.2.2 Battery voltage. After the VOLTAGE AND LEAKAGE meter has been calibrated in
accordance with 3.5.3, the test set shall measure no-load and loaded battery voltages with an
accuracy of  3 percent.
3.3.2.3 Battery short circuit currents. The test set shall measure battery short circuit currents
with an accuracy of  3 percent.
3.3.3 Continuity.
3.3.3.1 Cable assemblies CA-731 and CA-802. The D.C. resistance of each circuit of Cable
Assemblies CA-731 and CA-802 shall not exceed 0.15 ohm. The continuity of Cable Assembly
CA-731 shall be regarded as acceptable when all tests of 4.5.2 requiring the test set to be energized
are successfully performed.
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