Tbl. 19: Measurements For Checking The Analyzer - Pfeiffer Vacuum PrismaPro QMG 250 Translation Of The Original

Malfunctions
Measurement
Pin to ground
Pin to Pin
(see chapter "Contacts on QMA 250 and QME 250", page 67)
Tbl. 19:
8)
9)
68/86
Pins
all pins to GND (7 or 8)
All pins facing one another
Measurements for checking the analyzer
Although the measurements with the installed filament and ceramic shielding of the EM may be < 30 MΩ, it
must be > 30 MΩ when the filament and ceramic shielding of the electron multiplier have been removed.
Exceptions: Resistance between filament 1 and 2 (Pin 3 and 4) and filament Common (Pin 10)
Measured resistance
8)
> 30 MΩ
< 30 MΩ
9) > 30 MΩ
< 30 MΩ
Result
Ion source intact
Ion source defective
Ion source intact
Ion source defective