Adc Not Calibrated; A/D Overflow - Agilent Technologies 1260 Infinity User Manual

ADC Not Calibrated

The analog-to-digital converter located on the FLF board cannot calibrate.
Probable cause
1

A/D Overflow

This message is not implemented in firmware revision A.03.66 and below.
It indicates an overload situation of the A/D converter (sample signal). The
user-interface will show a not-ready condition for the FLD and an info event is
written into the logbook. If the message comes up during a run, it includes the
time of occurrence and when it disappears.
1200 FLD 1 A/D overflow (RT is 0.32 min) 16:33:24 02/11/99
1200 FLD 1 A/D overflow finished (RT is 0.67 min)16:33:46 02/11/99
If this condition is present prior to a run, the not-ready will prevent the
system to start the run/sequence.
With firmware revision A.06.11 and above, the A/D overflow leads into a flat
peak in the chromatogram. For details see
page 113.
Probable cause
1
2
Agilent 1260 FLD User Manual
Defective ADC or other FLF electronics.
PMT setting to high.
Wavelength setting wrong.
Error Information
Detector Error Messages
Suggested actions
Please contact your Agilent service
representative.
"Visualization of ADC Limits"
Suggested actions
Reduce PMT gain.
Change wavelength setting.
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