MIL-DTL-26517B
c.
Efficiency (see 4.5.5)
d.
Frequency influence (see 4.5.6)
e.
Ripple voltage (see 4.5.10)
f.
Parallel operation (see 4.5.7).
4.4.2.1.1 Rejection and retest. When an item selected from a production run fails to meet the specification, no
items still on-hand or later produced shall be accepted until the extent and cause of failure have been determined and
appropriately corrected. The contractor shall explain to the Government representative the cause of failure and the
action taken to preclude recurrence. After correction, all of the tests shall be repeated.
4.4.2.1.1.1 Individual tests may continue. For production reasons, individual tests or other sampling plans may
be continued pending the investigation of a sampling test failure. But final acceptance of the entire lot or items on-
hand or produced later, whichever the case may be, shall not be made until it is determined that all items meet all the
requirements of the specification.
4.4.2.1.1.2 Defects in items already accepted. The investigation of a test failure could indicate that defects may
exist in items already accepted. If so, the contractor shall fully advise the procurement activity of all defects likely to
be found and the method of correcting them.
4.5 Test methods (see 4.3.3; 4.4.1; and 4.4.2.1).
4.5.1 Examination of product (see Table I). The power supply shall be inspected by the Quality Assurance
Representative (QAR) to determine compliance with the requirements specified herein with respect to materials,
workmanship, dimensions, weight, and marking. Included in this inspection is verification that all materials used
are non-combustible (see 3.3.2).
4.5.2 Voltage regulation (see 3.5.10 and Table I).
4.5.2.l Type I regulated unit. The output voltage shall be measured at zero, one-fourth, one-half, three-fourths
and full-rated load at input voltages of 190, 200, and 210 V at 400 Hz. The output voltage shall remain within the
limits specified in the acquisition document (see 3.5.10.1 and 6.2).
4.5.2.2 Type II non-regulated unit. The output voltage of the power supply shall be measured at no load and
minimum specified load with the input held at 210 V at 400 Hz. Full-rated resistive load shall be connected and the
output voltage measured with the input held at 195 V at 400 Hz. During this test, the output voltage shall remain
within the limits specified in the acquisition document (see 3.5.10.2 and 6.2).
4.5.3 Variables affecting output voltage (see Table I). The output voltage shall be measured under the
following conditions. For each temperature condition, the voltage shall remain within the limits specified in the
acquisition document (see 6.2). For Type I regulated units, 190 VAC input shall be used in lieu of 195 VAC.
4.5.3.1 Voltage regulation at ambient temperature.
4.5.3.1.1 At 195 VAC input and 380 Hz. The load shall be varied from no load to full load. Sufficient data
shall be taken to accurately plot a voltage regulation curve.
4.5.3.1.2 At 200 VAC input and 380 Hz. The test specified in 4.5.3.1.1 shall be repeated.
4.5.3.1.3 At 210 VAC input and 380 Hz. The test specified in 4.5.3.1.1 shall be repeated.
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