VS Series Helium Mass Spectrometer Leak Detectors
3-8
DRAFT 4/
23/15
Filament Switches between Filament 1 and 2. The filament selection can be
performed manually, but occurs automatically if the current operat
-
ing filament burns out. A calibration routine is recommended every
time the operating filament is changed.
The change appears on the Home and System Information screens
and C flashes on the Home screen to indicate that calibration is
required.
NOTE Replace the filament inside the spectrometer as soon as it is
convenient after the spare filament has been put into use.
Gain Displays the current value of the Gain of the system. Gain is used
to scale the indicated value of a known leak to agree with a known
correct value. The gain parameter is adjusted after the leak detector
has been tuned to helium. It is automatically set by the Calibrate
Procedure (see
Section 2.2.4.1 “Calibration Set-Up” on page 2-17).
Use the value button (next to Gain) to change the Gain value.
NOTE Changing Gain changes Zero by the same percentage, which
can affect system transfer points.
Typical gain values range from 0.8 to 3.0. The higher the gain,
the more noise shows up in the least sensitive range.
To change a m a n u al tuning p a r a m e ter:
1. Press the desired parameter.
When you press the box containing the desired variable, a highlighted indicator appears
to the right of the numbers.
NOTE Once a change of value is initiated, you can press Cancel to
exit the screen and revert to the original value
2. Press the Up or Down arrow to peak the helium signal.
NOTE Do not press the ESC box before pressing the OK box. This
causes the selected parameter to revert to its previously stored
value.
3. Press OK to accept the changes and to store the new parameter value in the leak
detector memory.
4. Press Done to exit the screen and return to the previous menu screen.
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