Inficon Pernicka 700H CHLD, Translation Of The Original Operating Instructions

Page: 56 / 100

6 | Operation INFICON
56 / 100 Pernicka-700H-CHLD-Operating-instructions-jin76aen1-04-(1911)
If the measured helium signal is less than the threshold value after the gross leak test,
the measurement process is continued with the fine leak test.
1 Mini > Method > Load & Run or Measure > Method > Load & Run.
Fig. 28: Editor methods
2
Define the value of the parameter "Gross Leak threshold". This value must be
as small as possible for a high sensitivity, but in any case be greater than any
measured value of test objects without gross leak.
3 To save the settings, press the "Use Method" button.
ð
The setpoint for the gross leak test is set.
Procedure for determining an appropriate setpoint
1
Carry out several measurements without a test object or with a known tight test
object (depending on the test chamber used and the purge gas Argon 5.0,
typically values <1 x 10
-8
A).
ð Following the measurements, the value determined during the gross leak
measurement is displayed in the "Gross leak amplitude" column in the
"Locals" tab.
2 Evaluate average and spread.
3 Define a limit value, in which the natural scattering of the measured values does
not lead to randomly exceeding the gross leak setpoint.
4 Check the setpoint setting with a known leak test specimen.