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Insulation resistance
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Test Set Mark 127 MOD 4
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Time delay circuit calibration procedures



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MIL-T-21369C(OS)
3.4 Durability requirements.
3.4.1 Repeated package impact. After being mounted and vibrated as specified by 4.6.1, the
test set shall successfully meet the requirements of all subsequent tests required by figure 1.
3.4..2 Shock, transportation, storage and handling. The cornerwise drop test specified by 4.6.2
shall cause no damage to the exterior shipping container or the case of the test set. There shall
be no loosening of hardware or other mechanical damage that may impair the function of the test
set. Following the cornerwise drop test, the test set shall successfully meet the requirements of all
subsequent tests required by figure 1.
3.4.3 Vibration, transportation, storage and handling. The test set after being mounted and
vibrated as specified in 4.6.3 shall show no damage and shall successfully meet the requirements
of all quality conformance tests of 4.5.2
3.5 Calibration procedures. Each test set shall be calibrated in accordance with 3.5.1, 3.5.2 and
3.5.3. Calibration shall be performed at a temperature between 65F and 95F after the test set
has been connected to a 115 volt AC. supply by Cable Assembly CA-731, the ON-OFF switch
has been set at ON and the test set allowed to warm up for 15 minutes.
WARNING
Since high voltages are present in the test set power supply,
be extremely careful to avoid touching open leads or components.
3.5.1 Power supply circuit calibration procedure Procedures 3.5.1a through 3.5.1n shall be
performed in sequence with the Panel Chassis Assembly, Drawing 1362835, removed from the
Instrument Case, LD 276015.
a. Set the ON-OFF switch at OFF.
b. Connect the negative lead of the external vacuum tube voltmeter, Item 4.7a, to the g-rid cap
of the 6J7 tube and the positive lead to pin 8 of the 6J7.
c. Adjust RI 7 for approximate mid-rotation.
d. Set the ON-OFF switch to ON and allow one minute for voltages to stabilize.
1 volts. (Note: If adjustment is critical, adjust
e. Adjust R18 until external VTVM indicates 10
RI 7 until NE-32 glows.)
f. Set ON-OFF switch to OFF.
g. Remove positive and negative leads of external VTVM.
6

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