MIL-PRF-49293B
3.6.5 Immersion. The AN/PDR-75, in its carrying case, should not be damaged or
experience any degradation of performance after being immersed in fresh water to a
depth of not less than 3.3 feet (1 meter) for a period of 120 minutes (See 4.6.5).
3.6.6 Shock, Transit Drop. The AN/PDR-75, in its carrying case, should not be damaged
or experience any degradation of performance after being subjected to a sequence of
shocks applied in each direction along each of 3 mutually perpendicular axes (horizontal
and vertical). Shocks should be half sine pulses having a time duration of 4 milliseconds,
±5%. Shock pulses should have a peak amplitude of 100 g s ±15 g s (See 4.6.6).
3.6.7 Vibration. The AN/PDR-75 should withstand, without damage, simple harmonic
motion having an amplitude of ±0.015 inches (0.030 inch total excursion) with the
frequency being varied between 5-55 Hz (See 4.6.7).
3.6.8 Shock, Bench Handling. The AN/PDR-75 should not be damaged or experience any
degradation of performance after being subjected to normal bench handling shocks (See
4.6.8).
3.6.9 Dust (Fine Sand). The AN/PDR-75 should withstand, in both operating and non-
operating conditions, exposure to fine dust particles with wind speeds of 1750 ft/min
(17.3 knots) and exposure to sand particles with wind speeds of 5700 ft/min (56.4 knots)
(See 4.6.9).
3.6.10 Salt Fog. After the salt fog test (See 6.3), the AN/PDR-75 should operate without
degradation in specified performance and should show no evidence of degradation such
as flaking, pitting, blistering or loosening of finish on metal surface or exfoliation. Also,
there should be no binding or clogging of mechanical parts. Drawer contacts should be
cleaned prior to performance of operational checks to ensure contact with DT-236/PDR-
75 dosimeters (See 4.6.10).
3.6.11 Fungus. The AN/PDR-75, as prepared for operation, should be subjected to the
fungus test. There should be abundant growth colonization on 50 percent or more of the
area of the control item after 14 and 28 days. No cleaning of the reader is permitted for
72 hours prior to the fungus test. Handling, prior to and during testing, should be
accomplished without contamination of the reader (See 6.3). After the fungus test, the
AN/PDR-75 should be visually examined. The reader should show no more than sparse
microbial growth with restricted tubular growth development in an area ten percent or
less of the total area and no more than six unrelated minute circuit portions such as
terminal spacing, printed circuit boards, etc., with sparse growth due to random
contamination or traces of unmixed material ingredients. In addition, the reader should
operate without degradation in specified performance after the test of 4.6.11.
3.6.12 Temperature Shock. The equipment should be capable of withstanding
temperature shocks between -65°F (-54°C) and +145°F (+63°C) (See 4.6.12).
-6-
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business