________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Luke
Turnbull
Sent: Thursday, October 02, 2008 9:30 AM
To: [email protected]
Subject: DO-160 Section 15 - Calibration of Compass
Hi all,
Maybe a little off-topic.
Section 15 is a compass-safe-distance test. One measures the
deflection of a
compass (in degrees) caused by an EUT. I have been asked about how the
compass should be calibrated to demonstrate that the number it gives
(deflection in degrees) is traceable.
Does anybody have any experience with this test and the calibration of
the
compass?
Thanks,
Luke Turnbull
Luke:
I had started to do that test a couple of years ago, but I couldn't figure out
how to read a compass as accurately as needed. Even a large nautical compass
is difficult to resolve to one degree!
I began building an electronic compass, using a Honeywell HMC-1001 2-axis
magnetoresistive sensor. This had the promise to easily resolve one degree of
deviation due to external field influences. (Actually, the output is a pair of
DC voltages, proportional to the magnetic field. I would have needed to solve
the trigonometric solution for the deviation.)
It all sounded like a great idea, but the project requirement went away before
I even received the little bag of parts, so it remains another of those
uncompleted projects. (The parts are cheap, all your really need is the HMC
chip and a dual op amp, and a plastic case. Honeywell has a nice tech bulletin
with suggested schematics, etc.)
Ed Price
[email protected] <blocked::mailto:[email protected]> WB6WSN
NARTE Certified EMC Lab Rat
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (FAX)
Military & Avionics EMC Is Our Specialty
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