228
7 Analyzer
Detector
As the EM horn ages, the voltage (EMVolts) required by the electron multiplier
increases over time. If the electron multiplier voltage must always be set at or near
-3000 V dc to complete Autotune, with no other probable cause, it may need to be
replaced. Check your tune charts for gradual degradation, which indicates wearing
out. Select
View Tunes from the Qualify menu in the Instrument Control view to see
the tune charts. Sudden changes usually indicate a different type of problem.
See Also Troubleshooting (HP5973 MSD) in the online help for more information about
symptoms that may indicate electron multiplier problems.
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