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MIL-C-51542(EA)
(c) Close the circuit breaker on the converter and energize the
relay.  After approximately 5 seconds, the converter will start as indicated by
a high-frequency buzzing sound.  Operate the converter in this configuration
(no load) for 3 hours.  Then actuate the timer so that the converter cycles, on
and off, and operate the converter in this configuration for 3 hours.  For
reliability testing, the cycling shall continue until the reliability is demon-
strated.
4.4.4.2 Performance.  After the cycling burn-in test, the converter shall be
inspected to assure that it is still cycling properly and that the circuit
breaker is set.  Then:
(a) With the power applied as specified in 4.4.4. l(a) operate the
converter and make the following measurements using standard voltmeters and
frequency counters.  The voltmeter used in 4.4.4.2(e) and 4.4.4.2(f) must be a
true root-mean-square reading meter.  An average responding meter with a root-
mean-square compensated scale is not acceptable because of the pseudo square
wave output of the converter.
(b) DC voltage.  Measure in turn the DC voltage from test points 1,
2, and 3 to test point 4.  This voltage shall be as specified.  This test is
run with no load on the converter.
(c) AC voltage.  Measure the AC voltage between test points 5 and
6.  This voltage shall be as specified.  This test is run with no load on the
converter.
(d) Phasing.  Connect a 7 to 8 amp per phase load (see 6.3) to the
output of the converter as follows:
Phase 1
to
pin
A
of
J8
Phase 2
to
pin
B
of
J8
phase 3
to
pin
C
of
J8
Neutral
to
pin
D
of
J8
The output neutral of the converter must be isolated from ground
CAUTION:
(see 6.3).
Test the output phasing of the converter by observing that the applied load
rotates in the proper direction when possible, or by displaying the phases in
pairs on a dual trace oscilloscope for conformance with specified requirements.
(e) Output voltage.  With the load applied (4.4.4.2(d)), measure
the output voltage of the converter from line to line, i.e. A to B, B to C, and
A to C on connector J8.  This voltage shall be as specified.
(f) Output voltage.  With the load applied (4.4.4.2(d)) measure the
output voltage of the converter from line to neutral, i.e. A to D, B to D, and
C to D on connector J8.  This voltage shall be as specified.
7

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