INFICON UL1000 Helium leak detector - Manual (Page 70)

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Description of the Menu
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The measurement period (Maximum value) depends on the volume of the chamber,
volume of the tested object and the rejectant leak rate.
If the measured leak rate has gone below the trigger level, the measurement period
will be finished with the result PASS even if the maximum value of the measurement
period is not reached.
Examples for time settings
(using the Inficon Test Chamber with a volume of 430 cm³):
*external calibration with a 10E-9 test leak ( i.e. TL 9 ) recommended
Notice: After changing the measurement time a calibration request could be asked.
Settings: Interval:
time
1 - 20 sec 1 sec steps
20 - 30 sec 2 sec steps
30 - 60 sec 5 sec steps
1 - 30 min 10 sec steps
3 - 10 min 30 sec steps
10 - 30 min 1 min steps
Fig. 6-14 Measurement period
Range of rejectant level Measurement Period
10E-5 2 sec
10E-6 2 sec
10E-7 2 sec
10E-8 >5 sec
10E-9 >10 sec*