Crossbow Technology AHRS400 Series - AHRS Start Up Procedure

AHRS400 Series User’s Manual
Page 20 Doc# 7430-0004-01 Rev. A
completely non-magnetic. You can permanently magnetize ("perm up")
components in the AHRS if you expose the unit to a large magnetic field.
You can use a demagnetizer (tape eraser) to demagnetize the DMU if it gets
“permed.” Follow the instructions for your demagnetizer.
The DMU case is not weatherproof. You should protect the DMU from
moisture and dust.
þ EXAMPLE
4.2 AHRS Start Up Procedure
As an example, look at how the DMU might be used on an airplane.
Assume AHRS is mounted on a small twin-prop plane and will be used to
record the plane's attitude during flight. Flights will be 2 – 6 hours long.
The AHRS is mounted near the CG of the plane, and is connected to a
laptop serial port during flight.
1. Turn on power to the DMU and let it warm up 5 – 10 minutes.
Power can be on to all electronics, but the engines should be
off.
2. Start the engines.
3. Perform hard iron and soft iron calibration routines (Appendix
C).
4. Start data collection.
5. Proceed with flight.
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