Preparing For Calibration; Compass Calibration Verification; Compass Calibration - Teledyne WORKHORSE Operation Manual

WorkHorse H-ADCP Operation Manual

Preparing for Calibration

To prepare for compass calibration:
1. Place the H-ADCP on a piece of strong cardboard on top of a smooth wooden (non-magnetic) ta-
ble. If a wooden table is not available, place the H-ADCP on the floor as far away from metal ob-
jects as possible. Use the cardboard to rotate the H-ADCP during calibration—this way you will
not scratch the H-ADCP. Place the H-ADCP in the same orientation as it will be deployed.
2. Connect the H-ADCP as shown in
3. Start BBTalk. See the RDI Tools User's Guide for assistance on using BBTalk.

Compass Calibration Verification

Compass calibration verification is an automated built-in test that measures how well the compass is cali-
brated. The procedure measures compass parameters at every 5º of rotation for a full 360º rotation.
When it has collected data for all required directions, the H-ADCP computes and displays the results.
Verify the compass if you have just replaced the memory module or any ferrous metals is
relocated inside or around the H-ADCP housing. Calibrate the compass if the system has been
moved to a new location (see
To verify the compass calibration:
1. Prepare the H-ADCP for calibration (see
2. Using BBTalk, send a Break to wake up the H-ADCP.
3. At the > prompt, type AX and press the Return key.
4. When prompted, rotate the H-ADCP slowly 360 degrees (approximately 5 degrees per second).
Pay particular attention to the Overall Error. For example;
HEADING ERROR ESTIMATE FOR THE CURRENT COMPASS CALIBRATION:
OVERALL ERROR:
Peak Double + Single Cycle Error (should be < 5():
DETAILED ERROR SUMMARY:
Single Cycle Error:
Double Cycle Error:
Largest Double plus Single Cycle Error:
RMS of 3rd Order and Higher + Random Error:
If the overall error is less than 2°, the compass does not require alignment. You can align the compass to
reduce the overall error even more (if desired).

Compass Calibration

The built-in automated compass calibration procedure is similar to the alignment verification, but re-
quires three rotations instead of one. The H-ADCP uses the first two rotations to compute a new calibra-
tion matrix and the third to verify the calibration. It will not accept the new matrix unless the calibration
was carried out properly, and it asks you to verify that you want to use the new calibration if it is not as
good as the previous calibration. While you are turning the H-ADCP for the two calibration rotations, the
H-ADCP checks the quality of the previous calibration and displays the results. It compares these results
with the results of the third calibration rotation.
To calibrate the compass:
1. Prepare the H-ADCP for calibration (see
2. Using BBTalk, send a Break to wake up the H-ADCP.
3. At the > prompt, type AF and press the Return key. Choose option "a" or "b" to start the calibra-
tion procedure.
Setting up the H-ADCP
Compass Calibration
Preparing for
Preparing for
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May 2015
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