MIL-PRF-49293B
3.5.3 Reading Rate. The AN/PDR-75 should be designed to allow reading at least 60 DT-
236/PDR-75 s per hour (See 4.5.3).
3.5.4 Voltage Range. The AN/PDR-75 should operate at voltages between 21 to 30 volts
DC.
3.5.4.1 Power Supply Transient Voltage. The AN/PDR-75 should provide protection
from vehicular/charging system transients up to 40 volts for less than 50 milliseconds or
600 volts for less than 10 microseconds.
3.5.5 Orientation. The AN/PDR-75 should operate when inclined ±20 degrees from the
o
normal (0 ) orientation (See 4.5.5).
3.5.6 Burn-in. Each AN/PDR-75 should be operated for a minimum of 48 hours under the
conditions specified in paragraph 4.5.6. The burn-in should be concluded by a failure free
period, the duration of which should be not less than 16 hours. Performance should be
monitored as specified in paragraph 4.5.6 and its subparagraphs.
3.5.7 Secure Lighting. The equipment should not emit excessive light that can be readily
detected by image intensifier devices (See 4.5.7).
3.6 Environmental Conditions. The AN/PDR-75 should be subjected to and meet the
environmental conditions below. For the purpose of environmental conditions, specified
performance is defined as meeting the following requirements:
Requirement paragraph Measurement
3.5.1
Accuracy
3.5.2
Precision
3.6.1 High Temperature: The AN/PDR-75 should not be damaged or experience any
degradation of performance after being operated at 125+°F (+52°C) or stored at +160°F
(+71°C) (See 4.6.1).
3.6.2 Low Temperature. The AN/PDR-75 should not be damaged or experience any
degradation of performance after being operated at -25°F (-32°C) or stored at -70°F (-
57°C) (See 4.6.2).
3.6.3 Humidity. The AN/PDR-75 should not be damaged or experience any degradation
of performance following exposure to relative humidity of 94, ±4 percent (See 4.6.3).
3.6.4 Altitude. The AN/PDR-75 should not be damaged or experience any degradation of
performance following transport by aircraft to 40,000 feet (12,192m) (non-operating) and
operation at altitudes up to 10,000 feet (3,048m) (See 4.6.4).
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