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VS Series Helium Mass Spectrometer Leak Detectors
3.1.2 Manual Tuning
❑
Press Manual Tuning on the Set-Up screen and the Manual Spectrometer Tuning
screen appears (Figure 3-4).
Use this screen to manually adjust the parameters of the ion source in the
spectrometer for a maximum helium signal.
Select a value
to change it.
Accesses the
keypad to set Gain.
Select the
filament for use.
Emission Current
Ion Voltage
0
1
2
3
4
MANUAL TUNING
0.963
EMISSION
258.6
ION
GAIN:
OFFSET (V): 1126/9108
FILAMENT
1
2
Figure 3-4 Manual Tuning
Displays the value of the existing Emission current of the spectrom-
eter Ion Source and allows for emission current adjustment. The
emission current parameter tunes the leak detector, maximizing the
leak detector output for a peak helium signal.
Typical Emission current values range from 0.6 mA to 1.2 mA.
Displays the current ion voltage value of the spectrometer Ion
Source. The ion voltage parameter tunes the leak detector, maxi-
mizing the leak detector output for a peak helium signal.
Typical ion voltage values range from 250 VDC to 270 VDC. The
ion voltage value is automatically adjusted and set during the full
calibration routine.
5
6
7
8
9
2.0
10
Increments/
CANCEL
CANCEL
decrements
the selected value
OK
OK
DONE
3-7
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