ADS Environmental Services Model 4000 530017 A0 - Manual (Page 105)

Maintenance and Troubleshooting 5-19
Problem Monitor often provides a velocity reading of 0.
Possible
Causes
Doppler velocity sensor may be dirty or broken.
Cabling between the velocity board and the velocity
sensor may be bad.
Velocity board may be faulty.
Velocity parameters may require adjustment.
Possible
Solutions
Clean the velocity sensor.
Check the velocity parameters. Consider increasing the
maximum carrier parameter.
Inspect the velocity sensor cables for tightness.
Check for moisture in the connector.
Contact a trained ADS technician.
Replace the velocity sensor.
Replace the velocity board.
Problem Velocity data does not fluctuate much (but is not 0).
Possible
Cause
Doppler velocity sensor may be dirty
Velocity sensor may be broken.
Possible
Solutions
Clean the velocity sensor.
Check the velocity sensor connections.
Check the velocity parameters.
Contact a trained ADS technician.
Replace the velocity sensor.
Replace the velocity board.