VS Series Helium Mass Spectrometer Leak Detectors
DRAFT 4/23/15
2-17
2.2.4.1 Calibration Set-Up
❑ Press Calibration Leak Set-Up on the Menus screen.
The Calibration Set-Up screen appears (Figure 2-8).
Use this screen to:
❑ View the value and expiration date of the Internal Calibrated Leak
❑ Enter the External Calibrated leak value
❑ Select whether to use an Internal or external calibrated leak
❑ Set the calibration mode: Full or Fast Calibration
The calibration routine can be executed without removing the test object or test
fixture from the test port.
Figure 2-8 Calibration Set-Up
Full Calibration Performs a thorough tuning process and a system gain adjustment
(calibration). The full tuning process involves scanning the ion
source chamber voltage, and optimizing each value for a maxi
-
mum helium signal. Once the tuning process is complete, system
gain is adjusted to bring the leak detector into calibration. A full
calibration takes less than three minutes.
Fast Calibration Compares the leak rate signal with the calibrated leak value and
adjusts the gain to bring the system into calibration. If the gain
value is above the upper gain limit for the working range as defined
in Section 2.2.4.4 “Leak Rate Ranging” on page 2-25, then the fast
calibration process is terminated and a flashing c symbol appears
on the Home screen. A fast calibration takes less than 30 seconds.
* If the system cannot read the internal calibrated leak temperature, the system displays the
leak value and the temperature shown on the calibrated leak label. If this happens, the
calibrated leak symbol on the main screen turns red.
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10
CALIBRATION SET-UP
INTERNAL LEAK VALUE:
EXPIRES ON 08/02/2004
EXTERNAL LEAK VALUE:
CALIBRATE WITH
INTERNAL LEAK
EXTERNAL LEAK
MODE
FULL
FAST
DONE
1.5E-07 @ 26 °C
8.6E-07
0 1 2 3 4 5 6 7 8 9 10
Shows the
temperature
of the internal leak*.
Choose the
Calibration
Type.
Enter the
External Leak
Value.
Select leak used
for autocal.
compensated value
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