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WorkHorse Monitor/Sentinel Deployment Guide
Stability of the instrument during the calibration process, as well as a non-magnetic
calibration site is essential to getting the lowest overall error value.
Calibrating the Flux Gate Compass
This section applies to the original WH electronics only. See How do I know if I have WH or
WHII electronics? to determine what electronics are installed in the system.
To calibrate the Flux Gate compass:
1. Setup the communication parameters between TRDI Toolz and the ADCP.
2. Wake up the ADCP by pressing the
3. At the > prompt, type AR and press the Return key. This will return the compass to the factory
calibration matrix.
4. At the > prompt, type AF and press the Return key. Choose option "a" or "b" to start the calibra-
tion procedure.
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.
5. Tilt the ADCP. Tilt an upward-looking WorkHorse 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 orienta-
tion is OK. Adjust as necessary.
The tilts must remain constant during the rotations. The transducer beam is the center point
of the rotation.
6. When prompted, rotate the ADCP slowly 360 degrees (approximately 5 degrees per second).
7. The second rotation requires the ADCP to be tilted 15 degrees in another direction than from the
first rotation. Follow the on-screen instructions to orient the ADCP correctly. When prompted,
rotate the ADCP slowly 360 degrees (approximately 5 degrees per second).
8. The third rotation requires the ADCP to be tilted 15 degrees in another direction than from the
first and second rotations. Follow the on-screen instructions to orient the ADCP correctly.
9. If the calibration procedure is successful, it records the new calibration matrix to nonvolatile
memory. The ADCP will not change its matrix unless the calibration is properly carried out.
10. If the calibration procedure is not successful, return your ADCP to the original factory calibration,
by using the AR command. Try using the AR command if you have trouble calibrating your com-
pass. In some circumstances, a defective compass calibration matrix can prevent proper calibra-
tion.
For a detailed explanation of the calibration procedure, see the WorkHorse Operation
Manual, Chapter 4.
A compass calibration should be conducted at each measurement location, and whenever the
mounting fixture or ancillary equipment such as batteries are changed or rearranged.
button.
EAR99 Technology Subject to Restrictions Contained on the Cover Page.
P/N 957-6285-00 (July 2023)
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