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|  MIL-T-22913C(OS)
4.5.2.7.1 Resistive leg:
330 ohms plus or minus 10 percent 2 watt
resistor.
4.5.2.7.2 Capacitive-resistive leg: 2 microfards plus 20 percent
minus 10 percent, paper dielectric, 50 volt dc minimum, capacitor; con-
nected in series with a 3300 ohms plus or minus 10 percent, 1/2 watt re-
sistor.
4.5.2.8 High potential test set: This set shall be capable of furnish-
ing 500 volts rms and 1000 volts rms at 60 Hz. The set will be used for
insulation testing and shall include an alarm bell or light or combination
of both to indicate when any arcing or breakdown occurs.
4.5.2.9 Recorder:
Sanborn Model 320, dual channel dc amplifier recorder
or equivalent.
4.5.2.10 Switch: one three pole, single throw switch is required. The
switch shall have sufficient insulation resistance and creepage distance
between adjacent poles to withstand 1000 volts rms at 60 Hz for one minute
without any arcing or breakdown of insulation. Each switch pole shall be
capable of carrying a one-half ampere minimum reactive load current at 120
volts rms, 400 Hz continuously without any evidence of overheating. Max-
imum contact drop at one-half ampere rms shall not exceed 0.1 volt rms.
4.5.2.11 Oscilloscope: Tektronix Type 515 or equivalent.
4.5.2.12 Two resistors:
5100 ohms each, plus or minus 5 percent, 1/2
watt carbon.
4.5.2.13 Insulation tester capable of measuring 50 megohms with 500 volts
dc applied.
4.5.3 Test setup
4.5.3.1 Circuit setting adjustments shall be locked in place.
4.5.3.2 Using a separate dummy load for each connection, connect the
B terminal of a dummy load to each of the following: P-152 terminal 11,
P-152 terminal 9, a terminal of circuit 3, and a terminal of circuit 4.
4.5.3.3 Connect the A terminals of all dummy loads to the negative
terminal of the plus 26 volt dc power supply.
4.5.3.4 Join terminal 10 on P-152 and the remaining terminals of cir-
cuits 3 and 4 together, and then connect to the plus 26 volt dc terminal
of the dc power supply.
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