MIL-PRF-49293B
3.8 Electromagnetic Interference (EMI). The AN/PDR-75 should meet the following
emission and susceptibility requirements and the requirements of this specification. The
procedures recommended in 6.5 may be used as guidance (See 4.8).
a. The power supply switching frequency and its harmonics below 267 KHz are
allowed to exceed the limit by a maximum of 10 dB.
b. The injected interfering signal should be 1 KHz, 50% AM.
c. The power supply switching frequency and its second and third harmonics are
allowed to exceed the limit by a maximum of 20 dB.
d. The frequency range of test should be 10 KHz to 10GHz with the AN/PDR-75
immersed in the following radiated electric fields.
e. All electromagnetic interference (EMI) tests should be performed for both AC
power and DC power and DC power operations. For frequencies between 300 and
450 MHz and field intensities of 8 to 10 volts/meter an increase in reading
variation of up to ±20 cGy is allowable.
Frequency range
Field intensities
Modulation characteristics
0.01 - 2 MHz
1V/M
AM 50% 1 KHz tone
2 - 30 MHz
5V/M
"
30 - 2000 MHz
10V/M
"
2 - 10 GHz
5V/M
"
3.9 Reliability and Maintainability. The AN/PDR-75 should have a specified (Θ0) mean-
time between failure (MTBF) of 800 hours. The lower test MTBF (Θ1) should be 400
hours. The reliability requirements should be demonstrated when operating under the
following conditions (See 4.9):
a.
Operating temperature: -25°F to +125°F, (-32°C to +52°C)
b.
Environment: Ground mobile
c.
Duty cycle: 100%
NOTE: Use of MIL-HDBK-781 is recommended.
-8-
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