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Transpector MPH Operating Manual
6.6.1.2.5 Tuning with Background Gases
Mass 4 must be calibrated for proper leak detection. If Transpector MPH is used as
a leak detector, make sure that helium is available for tuning. If Transpector MPH
is only used for leak checking, mass 4 is the only mass to tune. To tune mass 4,
find a way to introduce helium into the vacuum chamber.
The following procedure may be used if test mix or helium is not available.
1 Default all tune parameters.
2 Delete all masses except 1, 2, and 4.
3 Add mass 28 (or 40) and tune.
4 Delete mass 4.
5 Tune highest mass available in the system; in some cases this may be mass
40 or 44.
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