MIL-PRF-49404A(CR)
Using the voltage gain and signal bandwidth of the amplifier, noise shall be calculated using the
equation as follows:
enoise = {[eout ÷ (A x (NBW)1/2)]2 - [eamp]}5/2
Where: enoise = equivalent input noise seen at the regulator output
eout = rms noise voltage measured at the amplifier output
A = amplifier voltage gain
NBW = noise bandwidth = (š/2) x amplifier signal bandwidth
signal bandwidth low 3 dB point = 10 Hz maximum
signal bandwidth high 3 dB point = 50 kHz minimum
eamp = equivalent amplifier input noise
Failure to meet the requirement of 3.5.4 shall constitute failure of this test.
4.6 Environmental tests. Environmental testing shall be performed in accordance with the
requirements contained herein, except when a contractor's test plan showing equivalent methods
has been approved by the Government contracting office. When the contractor's test plan
deviates from the test procedures prescribed, the contractor shall be required to show where his
own tests and methods for verifying the specified performance are equivalent. Also,
measurements taken by the contractor during verification testing of all environmental
requirements shall be accomplished using known testing apparatus such as an environmental test
chamber, vibration test table, pendulum shock device or similar equipment for which the
technical capabilities to properly simulate extreme climatic or environmental conditions are
scientifically documented. In general, the methods for testing to verify compliance with all
stated performance characteristics selected by the contractor shall be equivalent to recommended
procedures specified herein.
4.6.1 Temperature shock. Verify compliance with the temperature shock requirement of
3.6.1. Use of the tests prescribed in 6.3 is recommended. Failure to meet the requirement shall
constitute failure of the test.
4.6.2 High temperature. Verify compliance with the high temperature requirement of
3.6.2. Use of the tests prescribed in 6.3 is recommended. Failure to meet the requirement shall
constitute failure of the test.
4.6.3 Low temperature. Verifying compliance with the requirement of 3.6.3. Use of the
tests prescribed in 6.3 is recommended. Failure to meet the requirement shall constitute failure
of the test.
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