124 Keysight NFA Series Noise Figure Analyzers Service Guide
Instrument Messages
Condition Messages
309 4 User Cal; Cal
invalidated
E,W The existing user cal has been invalidated for one
of the following reasons:
Frequency: Setting the frequency outside the
current valid user cal set (for example: If the
current sweep range is 2 to 3GHz, then setting
the start frequency to 1.9 GHz will invalidate the
current user cal. Other frequency changes that
will invalidate the user cal are:
• If the cal was performed at a fixed
frequency and you change this
frequency.
• If you are in "Freq List" mode and you
change it to extend beyond the current
user cal range. In this case you will see
an error message.
DUT Type: If the DUT Type parameter changes,
causing the measurement frequencies to be
pushed outside the current cal.
Attenuation: If an attenuation setting is selected
but has not been calibrated.
Preamp: If set to condition different from current
cal settings, for example: if calibrated with the
preamp on, turning it off will invalidate the cal.
Points: Changing the number of measured
frequency points can make the stored preselector
offsets become inaccurate and hence invalidate
the calibration. This occurs when the following
conditions exist:
• A successful calibration has been
performed.
• Some measured freq points are > 3.6
GHz.
• The new points > 3.6 GHz are located
more than 50 MHz away from the
current calibration points.
309 4 User Cal; Freq
outside cal range
E The existing user cal has been invalidated
because the current measurement frequencies lie
partially or wholly outside the range of
frequencies used for user-cal. (UNCAL)
309 4 User Cal; Cal will be
interpolated
W The measurement frequency range has been
changed such that it is a subset of the calibrated
range. (~CAL)
Err# Bit in
status
register
Message Error or
Warning
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