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1-8
WFM90D and WFM91D Service Manual
Physical Characteristics
Table 1- 8: Physical characteristics
Category Description
Dimensions REF: Instrument:
5 inches (127 mm).
3.15 inches (80.0 mm).
9.6 inches (243.8 mm).
Shipping Box:
13.25 x 13.75 x 6 inside
14 x 14.25 x 6.25 outside
Weight REF: With batteries and pouch:
3 lb. 13 oz.
Without batteries and pouch:
2lb.8oz.
Shipping weight with packaging:
6lb.8oz.
Environmental Characteristics
Table 1- 9: Environmental characteristics
Category Description
Operating Altitude REQ: To 9,842 feet (3000 meters).
Operating Temperature REQ: 0°C to +40° C.
Vibration -- Operating REF: 15 minutes each axis at 0.015 inch, frequency varied from 10--55--10 Hz in 1-minute
cycles with instrument secured to vibration platform. Ten minutes each axis at any
resonant point or at 55 Hz if no resonant point is found.
Shock -- Non-Operating REF: 100 g’s, 1/2 sine, 11 ms duration, 3 shocks per surface (18 total).
Transportation REF: Qualified under NTSC Test Procedure 1A, Category II (24-inch drop).
Humidity REF: Will operate at 95% relative humidity for up to five days.