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  Characteristic
Performance
Requirement
Supplemental
Information
Temperature
Automatic resetting thermal cutout protects
15° C to +55° C
Operating
instrument from overheating.
55° C to +75° C
Non-operating
Altitude
15,000 feet maximum
Altitude referred to sea level. Operating
Operating
temperature capabilities decline 10 C per
1000 feet altitude above sea level.
May be tested during non-operating tem-
Non-operating
perature test.
Humidity
Mil-Std-202C,
Exclude freezing and vibration.
Five cycles (120 hours) of
Non-operating
Method 106B
Electromagnetic Interference (EMI)
Tested within an electrically shielded enclo-
150 kHz to 1000 MHz
Radiated Interference
sure with the CRT mesh filter installed.
Within the limits described in MIL-I-6181D,
Figs. 7, 8, 14 and 16.
150 kHz to 25 MHz
Conducted interference through the power
Conducted
Interference
cord.
Vibration
Resonant searches along all 3 axes at 0.025
Instrument secured to vibration platform
Operating
inches, frequency varied fram 10-55 c/s. All
during test. Total vibration time, about 55
minutes.
major resonances must be above 55 c/s.
Guillotine-type shocks. Total of 12 shocks.
Shock
One shock of 30 G, one-half sine, 11 milli-
Operating and non-operating
second duration each direction along each
major axis.
Transportation
Package vibration
Meets National Safe Transient type of test
Package should just leave vibration surface
when correctly packaged. One hour vibra-
tion slightly in excess of 1 G.
Package drop
30 inch (18-inches for R491) drop on any
corner, edge or flat surface.
1-4
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