To Check The Npd Leakage Current - Agilent Technologies Agilent 7890 Series Maintenance Manual

To Check the NPD Leakage Current

Maintaining Your GC
1 Load the analytical method.
Set the NPD Adjust Offset to Off and the Bead Voltage to
2
0.00 V.
• Leave the NPD at operating temperature
• Leave flows on or off
Press [Front Detector] or [Back Detector], then scroll to
3
Output.
4 Verify that the output (leakage current) is stable and
< 2.0 pA.
The output should slowly drop towards 0.0 pA, and
should stabilize in the tenths of a picoamp. Current
> 2.0pA indicates a problem.
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Maintaining the NPD
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