Agilent Technologies E4419B User Manual page 173

-231 Data questionable;CAL ERROR ChB
Power meter calibration failed on channel B. The most likely cause is
attempting to calibrate without applying a 1 mW power to the power
sensor.
-231 Data questionable;Input Overload ChA
The power input to Channel A exceeds the power sensor's maximum
range.
-231 Data questionable;Input Overload ChB
The power input to Channel B exceeds the power sensor's maximum
range.
-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 ChA
Power meter zeroing failed on channel A. The most likely cause is
attempting to zero when some power signal is being applied to the
power sensor.
-231 Data questionable;ZERO ERROR ChB
Power meter zeroing failed on channel B. 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 Agilent E-series power
sensor and one is not connected.
-310 System error;Ch A Dty Cyc may impair accuracy with ECP
sensor
This indicates that the sensor connected to channel A is for use with
CW signals only.
Agilent E4419B User's Guide
Error Messages
Error Messages
4-9