RF-voltage adjustment on Finnigan Magnum/ITS 40
Posted: Sat Dec 31, 2011 8:30 pm
One freshly inherited Finnigan Magnum is giving me headaches: The RF-ramp is too steep and totally out of tune above 500 amu (very irregular readings).
I've found that the RF-voltage is said to be adjusted with the huge screw above the RF-cover in the middle of mass spectrometer.
Could you please fill me in just how to do it and what cautions to observe?
I've found that the RF-voltage is said to be adjusted with the huge screw above the RF-cover in the middle of mass spectrometer.
Could you please fill me in just how to do it and what cautions to observe?