Attaining A Stable Operating Temperature For Prismapro; Selecting The Gas Mixture For The Mass Calibration; Setting High Frequency For Both Polarities; Tbl. 14: Mass Calibration - Pfeiffer Vacuum PrismaPro QMG 250 Translation Of The Original

Maintenance
Mass [u]
1
2
4
28
86
134
293
Tbl. 14:
9.6.2 Attaining a stable operating temperature for PrismaPro
Prerequisites
● Heater off
● EM
● Emission on
● Parameter Scan: 0 – Max. u
● Parameter Dwell: 32 ms
● Parameter ppAMU:
Required software
● Web UI
Procedure
► Allow PrismaPro to run for at least 1 hour before performing the settings or calibrations.
9.6.3 Selecting the gas mixture for the mass calibration
Procedure
1. Use various gas mixtures for mass calibration depending on the mass range and the accuracy re-
2. For the calibration, define at least 3 masses, one each in the lower, average and upper mass
9.6.4 Setting high frequency for both polarities
When the PrismaPro is initially commissioned, after changing the analyzer or the electronic unit, or in
case of aging or changes to the installation conditions, the HF stage of the PrismaPro must be retuned.
The "Reset RF frequency" function scans the high-frequency range automatically and tunes the high-
frequency range to the optimum high-frequency for the analyzer. The software performs the HF adjust-
ment for the specified amount of time before returning to normal mode. During HF adjustment, the soft-
ware does not acquire data. An HF warning "Hardware information: Hardware Warning = RF board"
may be displayed. This is normal before the HF setting.
7)
58/86
Gas used Mass position toler-
ance [u]
H ±0.05
H
He
N
Kr
Xe
FC-5311
Mass calibration
7)
off
─ 10 (QMA with mass range up to 100 u)
─ 5 (QMA with mass range up to 200 u)
─ 1 (QMA with mass range up to 300 u)
quirements.
range.
– If you determine more than 3 masses, this increases the quality of the calibration.
Power loss of the HF stage
If the device is generating excessive power loss due to poor tuning of the HF stage, you will
not be able to turn on the emission. The HF stage is pre-adjusted with continuous scanning
across the entire mass range of 0 u to max. u during the start-up time. Final HF adjustment
is then performed following the start-up time.
for QMA 250 M only
100 u 200 u
Peak width at 10 % of the peak height (resolution)
0.5 ±0.15 0.5 ±0.15
0.9 ±0.05 0.9 ±0.05
-
-
300 u
0.5 ±0.15
0.9 ±0.05