Troxler Enhanced RoadReader Plus 3451 Manual Of Operation And Instruction page 199

ERROR! Invalid Warmup Characters.
This error can occur when warming up the gauge.
Possible causes:
✓ PDA is not within 4.6 m (15 ft) of the gauge.
✓ Object in the way of the transmitter/receiver.
Error: Math error encountered!
Retake the measurement.
This error can occur after taking a reading (count) or a partial
calibration.
Possible causes:
✓ Counts received are not valid.
✓ Depth strip was in an improper position (Manual mode).
Error: No marshall directory exists!
This error can occur if the PDA directory/subdirectory structure has
been altered.
Possible causes:
✓ The Marshall directory has been deleted.
✓ PDA has an internal problem.
Error: No proctor directory exists!
This error can occur if the PDA directory/subdirectory structure has
been altered.
Possible causes:
✓ The proctor directory has been deleted.
✓ PDA has an internal problem.
Error: No project directory exists!
This error can occur if the PDA directory/subdirectory structure has
been altered.
Possible causes:
✓ The project directory has been deleted.
✓ PDA has an internal problem.
Appendix C–16