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If the test object passes the second GROSS measurement, the device switches to
FINE measurement again. From the difference between the 2 FINE measurement
results, the device calculates the leak rate.
Turbo measurement
If a trigger value greater than 1 × 10
-3
mbar l/s per liter of the net volume is set, the
device automatically carries out a turbo measurement. The turbo measurement only
takes 6 seconds, consisting of 3 seconds settling time and 3 seconds measurement
time. The device is ready to measure again after 2 further seconds.
6.5.2 Carrier gas measurement
The following diagram shows the typical helium concentration over time in a
measurement chamber with a leaking test object.
1
Helium concentration
4
Time
2
Start
5
Increasing signal
3
Helium in environment
6
Stable signal, final value
Содержание 540-200
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