MIL-PRF-25435D
3.6.10 Endurance. The transmitter shall withstand 60,000 cycles of operation from a 0 indicator
reading to 80 ± 5% of full scale and back to a 0 reading at a rate of 30 ± 10 minute (cpm).
3.6.11 Interchangeability. All parts having the same manufacturer s part number shall be
functionally and dimensionally interchangeable.
3.6.12 Electromagnetic interference. The transmitter shall neither cause nor be susceptible to
electromagnetic interference.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on five transmitters of
each part number ordered. Four transmitters shall be subjected to all tests in 4.5 and one shall be
used for the fungus test (see 4.5.16).
4.3 Conformance inspection. Conformance inspection shall consist of tests indicated in 4.3.1
and 4.3.2.
4.3.1 Individual tests. Each transmitter shall be subjected to tests indicated in 4.5.1 through
4.5.5.
4.3.2 Sampling tests. For the first 100 transmitters, 3 shall be selected randomly, and for each
additional 100 transmitters, 1 shall be selected randomly and subjected to the tests in 4.5.1
through 4.5.8.
4.4 Test conditions.
4.4.1 Atmospheric conditions. Unless otherwise specified, all tests shall be performed at an
ambient temperature of 75 ± 9 °F (25 ± 5 °C) and at site ambient pressure.
4.4.2 Voltage. Voltage applied shall be 25 V, 400 Hz, from a single-phase power source.
Voltage and frequency shall be within ±1% of the nominal value.
4.4.3 Test standard. The transmitter shall be tested with an indicating test standard consisting of
a standard indicating unit calibrated to a maximum error of 0.25 percent with a standard ratio
transformer circuit as shown in Figure 2.
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