HP EPM-441A User Manual page 134

Error Messages
Error Messages
-231 Data questionable;Lower window log error
This indicates that a difference measurement in the lower window has
given a negative result when the units of measurement were
logarithmic.
-231 Data questionable;Upper window log error
This indicates that a difference measurement in the upper window has
given a negative result when the units of measurement were
logarithmic.
-231 Data questionable;ZERO ERROR
Power meter zeroing failed. The most likely cause is attempting to zero
when some power signal is being applied to the power sensor.
-241 Hardware missing
The power meter is unable to execute the command because either no
power sensor is connected or it expects an HP E-series power sensor
and one is not connected.
-310 System error;Dty Cyc may impair accuracy with ECP sensor
This indicates that the sensor connected is for use with CW signals
only.
-310 System error;Detector EEPROM Read Failed - critical data not
found or unreadable
This indicates a failure with your HP E-series power sensor. Refer to
your power sensor manual for details on returning it for repair.
-310 System error;Detector EEPROM Read Completed OK but
optional data block(s) not found or unreadable
This indicates a failure with your HP E-series power sensor. Refer to
your power sensor manual for details on returning it for repair.
-310 System error;Detector EEPROM Read Failed - unknown
EEPROM table format
This indicates a failure with your HP E-series power sensor. Refer to
your power sensor manual for details on returning it for repair.
4-8 HP EPM-441A User's Guide