MIL-PRF-49176B(CR)
4.5.2 Output voltage and output current. Output voltage and current shall be measured to
verify that the regulator is capable of supplying 180 detectors at 6 mA each, or a total of 1.08
amperes. A resistive load of 4.64 ohms, ± 1 percent shall simulate the detector load, and both the
loaded and unloaded output voltages shall be measured. The loaded output voltage shall be
measured for input supply voltages of +9.5 and +10.0 Vdc. Failure to meet requirements of 3.5.2
shall constitute failure of this test.
4.5.3 Current limit. Short-circuit current limit shall be measured with an ammeter with a
short circuit on the regulator output. Failure to meet requirements of 3.5.3 shall constitute failure
of this test.
4.5.4 Line rejection. With the regulator loaded (4.6.1), line rejection shall be measured by
modulating the input supply with a sinusoidal signal, which provides a variable input ripple. An
oscilloscope shall be used to observe the ripple inserted on the input and the ripple appearing on
the output. The oscilloscope shall be isolated and referenced to test point J10 on the regulator.
Line rejection is the ratio of the input peak-to-peak ripple to output peak-to-peak ripple. Line
rejection shall be measured from 10 Hz to 35 KHz. Failure to meet requirements of 3.5.4 shall
constitute failure of this test.
4.5.5 Output impedance. Output impedance shall be measured using a varying load network
with a modulated input and an oscilloscope to measure the ac output current and voltage. The
output impedance is the ratio of the output voltage difference between the no load and full load
conditions to the maximum output current at full load condition. Failure to meet requirements of
3.5.5 shall constitute failure of this test.
4.6 Environmental tests. Environmental testing methods contained in section 6.4 are
acceptable methods for determining compliance with Section 3.6 et el. The contractor may elect to
use alternative methods and testing procedures. In such cases, the contractor shall be required to
show where his own tests and measurements for verifying the environmental conditions are
equivalent to the methods cited herein. Where the contractor desires to deviate from these cited
methods, he shall be prepared to show equivalency via a test plan which has been approved by the
Government contracting office. Also, environmental tests shall be accomplished using known
commercially accepted testing apparatus such as an environmental test chamber, vibration test
table, pendulum shock device, or similar test equipment for which the technical capabilities to
properly simulate extreme climatic or transportation conditions are scientifically documented. The
methods for testing to verify compliance with all stated performance characteristics selected by the
contractor shall be equivalent to the recommended procedures found herein.
4.6.1 Temperature shock. Measure compliance with the requirement of 3.6.1. Recommend
performing the tests prescribed in 6.4. Failure to meet the requirement shall constitute failure of
the sample.
4.6.2 High temperature. Measure compliance with the requirement of 3.6.2. Recommend
performing the tests prescribed in 6.4. Failure to meet the requirement shall constitute failure of
the sample.
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