Tue Apr 22, 2014 3:00 pm by mleipold
There definitely is a warm-up time needed with the detector and other internal electronic components.
There is also probably a plasma stability issue.
However, if you monitor oxide ratio, the oxide signal typically *does* go down over the warm-up period, even if you don't wind up changing Current, Makeup Gas, or Detector Voltage. This might only be going from, say, 4-5% down to 2-3% oxide, but does occur. And this is separate from any equilibration that usually happens between the tuning solution solution-phase ions and the ions adsorbed to the tubing.