Fluke 9100 User Handbook Manual page 181

10.2.4.3 'Characterise DAC' Errors
If for any reason the Model 9100 is unable to complete one or more of the Characterise
DAC operations, error messages similar to that shown below will be displayed and
default correction factors will be written to the Model 9100's non-volatile calibration
memory.
Special Calibration
Corrupt polarity gain (DAC)
TODAYS DATE TIME
Chse —
DAC
Although these default correction factors will allow the Model 9100 to remain functional,
you should not proceed with calibration until the cause of the error has been established
Final Width = 215mm
and rectified. In most cases, occurrence of this type of error will mean that the Model 9100
has developed a fault, in which case you should consult your local Fluke Service
Center for assistance. However, before doing so it is worth repeating the Characterise
DAC process to make sure that the failure was 'real' and not caused by external influences
such as a disturbance in the Model 9100's line supply.
Section 10: Calibrating the Model 9100: Calibration Mode 10.2-7