AHRS500GA Series Operator’s Manual
Doc# 7430-0060-02 Rev. A
Page 27
Repeat the “collecting calibration data” paragraph above, making another
complete turn circle with the aircraft. Always turn the aircraft the same
direction as the first turn. After the complete turn, the system will again
reinitialize, and apply the latest estimates of the calibration parameters as
described in the “Evaluating Calibration Data” paragraph. Continue
repeating the cycle of turning the aircraft until initialization mode is
indicated, looking at the mag cal data status bit for adequate data, and then
waiting for the ready status (~90 seconds) before turning the aircraft again.
In this way, the calibration algorithm continues to refine itself until it
achieves a successful calibration.
9.4.5
Completing the Calibration
At this point, the AHRS500GA has collected enough data for a good
magnetometer compensation calibration. Move the calibration switch on
the maintenance/calibration cable to the OFF position. The AHRS500GA
will now store these as calibration constants in the EEPROM for use upon
subsequent power cycles. The Gyro View BIT status display should look
like:
9.4.6
Testing the Calibration
The heading calibration can be tested by comparing the heading output of
the AHRS500GA against a known reference (compass or compass
markers).
SYSTEM STATUS:
READY
BIT 10: OFF
BIT 9: OFF
MAG CAL DATA STAT:
ACCEPT
BIT 13: OFF
MAG CAL MODE:
NORMAL MODE
BIT 11: OFF
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