Figure 24. Compass Calibration - Teledyne WORKHORSE Operation Manual

May 2015
Field Calibration Procedure
Choose calibration method:
a. Remove hard iron error (single cycle) only.
b. Remove hard and soft iron error (single + double cycle).
c. Calibration for a single tilt orientation (single + double cycle).
d. Help.
e. Quit.
In general, the hard iron calibration is recommended for Monitor and Mariner systems because
the effect of hard iron dominates soft iron.
For Sentinel systems that have just replaced the battery, then use the combined hard and soft
iron calibration. Changing the H-ADCP Sentinel batteries should only change the hard-iron
signature of the H-ADCP, but can induce both single and double cycle compass errors.
4. Tilt the H-ADCP (see Figure 24). Tilt an upward-looking H-ADCP with a block under one side of
the end-cap. A 35-mm block will give you an 11-degree tilt. Check the on-screen instructions to see
if the orientation is OK. Adjust as necessary.
The tilts must remain constant during the rotations. The transducer beam is the center point of
the rotation.
5. When prompted, rotate the H-ADCP slowly 360 degrees (approximately 5 degrees per second).
6. The second rotation requires the H-ADCP to be tilted 15 degrees in another direction than from
the first rotation (see Figure 24). Follow the on-screen instructions to orient the H-ADCP correct-
ly. When prompted, rotate the H-ADCP slowly 360 degrees (approximately 5 degrees per second).
7. The third rotation requires the H-ADCP to be tilted 15 degrees in another direction than from the
first and second rotations. Follow the on-screen instructions to orient the H-ADCP correctly.
8. If the calibration procedure is successful, it records the new calibration matrix to nonvolatile
memory. The H-ADCP will not change its matrix unless the calibration is properly carried out.
9. If the calibration procedure is not successful, return your H-ADCP to the original factory calibra-
tion, by using the AR-command. Try using the AR-command if you have trouble calibrating your
compass. In some circumstances, a defective compass calibration matrix can prevent proper cali-
bration.
Page 62
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Figure 24. Compass Calibration
WorkHorse H-ADCP Operation Manual