I have some questions regarding the performance report parameters for a 7900 ICP-MS.
What exactly is the background measuring? How is the "background" or noise of masses 7, 89, and 205 determined? At what point should an analyst be concerned due to the rising background?
I want to monitor the voltages of the pulse and analog detectors to gauge when replacement is necessary. I'm guessing I should use the parameters "analog HV" and "pulse HV" under Hardware Settings EM. There are also "Analog HV" and "EM HV Gain" parameters under Meter, however. The latter two are expressed as negative voltages. Can anyone explain the difference between these parameters, and which ones are more relevant for assessing detector condition?