230 Maintaining Your GC
11 Maintaining the NPD
To Check the NPD Leakage Current
1 Load the analytical method.
2 Set the NPD Adjust Offset to Off and the Bead Voltage to 0.00 V.
• Leave the NPD at operating temperature
• Leave flows on or off
3 Using the software keyboard, press [Front Det] or [Back Det],
then scroll to Output. Alternately, use the arrows keys on the
GC to scroll to 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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