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|  MIL-I-60166 (MU)
4.6.7.5 Insulation resistance.- This test shall be conducted by measuring the
insulation resistance between mutually insulated parts by means of a meg ohm bridge
or other approved method with the DC potential applied as specified in 3.6.3 to
determine compliance the rewith.
4.6.7.6 Dielectric strength. - The inverter shall be tested in accordance with
the potential and duration specified in 3.6.4, and the test Method 301 of
Standard MIL-STD-202 to determine compliance with the requirements specified in
3.6.4.
4.6.8 Performance. - The inverter shall be observed for spasmodic or inter-
mittent operation while being subjected to the tests of 4.6.8 to 4.6.8.6 inclusive
to determine conformance with 3.7. Any evidence of spasmodic of intermittent
operation during these tests shall be cause for rejection.
4.6.8.1 Input voltage surge. - While energized with its normal rated input
voltage, apply the input voltage spikes specified in 3.7.1, for the required time
period. The inverter shall be examined during this test to insure against increased
output voltage and subsequent to the application of the voltage spikes, the inverter
shall show no evidence of damage in compliance with the requirements specified in
3.7.1.
4.6.8.2 Output voltage. - This test shall be conducted utilizing standard mea-
suring equipment. The input voltage shall be established at the minimum voltage,
the mean voltage and the maximum voltage of the 18 to 30 Vdc operational range.
The measured rms output voltage shall meet the requirements of 3.7.2.
4.6.8.3 Output voltage regulation. - With the inverter energized and any combinat-
ion from no load (OVA) one-half load (75VA) to full load (150VA ) variation applied.
the input voltage shall be measured in 3 volt increments from 18 to 30 volts dc with
standard measuring equipment. The measured output voltage shall be within the
specified tolerance of 3.7.3.
4.6.8.4 Output frequency.- This test shall be conducted utilizing standard
measuring equipment. The input voltage shall be established at the minimum
voltage, the mean voltage, and the maximum voltage of the 18 to 30 Vdc operational
voltage range. The measured output frequency shall be within the tolerance speci-
fied in 3.7.4.
4.6.8.5 Harmonic distortion. - Energize the inverter and establish the input
voltages at the minimum voltage, the mean voltage and the maximum voltage of
the 18 to 30 Vdc operational voltage for this test. The inverter shall have a
harmonic distortion of less than 4% as specified in 3.7.5 when subjected to any
load combination for each of the input voltages from no load (OVA), one-half load
(75VA) and full load (150VA) and the minimum loads required to obtain the power
factor range of 0.8 leading and 0.6 lagging. The harmonic distortion variation shall
be 1.5% or less as specified in 3.7.5 when the inverter is subjected to a nominal
load of 75VA at constant unity power factor for 15 minutes at each of the input
voltages. The measured harmonic distortion shall not exceed the tolerances specified
and there shall be no evidence of electrical voltage spikes during test in compliance
with 3.7.5. All measurements shall be made with standard measuring equipment.
14.
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