MIL-DTL-19803G
generating system. The time required to attain buildup pressure shall be within the time
specified in 3.5.4.
4.6.6 Dielectric strength. The sensing element shall be installed in an empty converter, and
the dielectric strength of the sensing element shall be measured at a voltage of 500 volts, rms, at
a commercial frequency. The voltage shall be maintained for a period of 10 seconds between
each lead wire and the converter ground and between the two lead wires. The sensing element of
the converter shall meet the requirements specified in 3.5.5.
4.6.7 Insulation resistance. The sensing element shall be installed in an empty converter,
and the insulation resistance of the sensing element shall be measured at 50 volts, direct current,
between each electrode and the converter ground and between the electrodes. The sensing
element of the converter shall meet the requirement specified in 3.5.6.
4.6.8 Sensing element calibration.
4.6.8.1 Empty converter. The sensing element shall be installed in an empty converter and
the capacitance of the sensing element measured. The capacitance shall be within the limits
specified in 3.5.7.1.
4.6.8.2 Filled converter. The converter assembly shall be filled to rated capacity with liquid
oxygen. The liquid oxygen shall then be removed in five increments of 5.1 + 0.2 pound (2.31 +
0.09 kg). The capacitance of the sensing element shall be measured with the converter filled and
at each increment. The capacitance shall be within the limits specified in 3.5.7.2.
4.6.9 Relief valve test. A pressure source capable of being varied from 0 to 150 psi (0 to
1034 kPa) shall be connected to the converter test port. The pressure in the converter shall be
slowly increased until the relief valve of the converter actuates, continue increasing pressure to
120 psi (827 kPa). The opening pressure of the relief valve and the flow rate through the valve
shall be within the limits specified in 3.5.8.
4.6.10 Evaporation loss tests. The evaporation loss tests in the vented condition may be
conducted on the container only. The weight losses shall be recorded on the vacuum
performance test plate as specified in 3.5.9.
4.6.10.1 Initial evaporation loss in vented condition. The container shall be filled with
liquid oxygen to rated capacity and allow to stand in vented condition for a minimum period of
two hours for equilibrium to be established. After which, with the unit vented to the atmosphere,
the loss in weight for a 24-hour period shall be recorded. The container shall meet the
requirements specified in 3.5.9.1.
4.6.10.2 Second evaporation loss in vented condition. After a lapse of at least 30 days from
the above test, the vented evaporation loss test shall be conducted in the same manner and the
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