Inficon 550-300A, Operating Manual

Page: 37 / 128

Working Modes
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To ensure that such an abundance of consecutive „FAIL“- messages is not caused
by the helium background of the test equipment, a reference measurement is recom-
mended.
Reference measurement
If the ambient helium emitted by the chamber is significant in relation to the target
leak rate, it is possible to perform a reference measurement.
In the software menu, it is possible to enable a reference measurement. If it is
enabled, it can be called via the Measurement screen.
During the reference measurement, the Modul1000 determines the internal helium
background of the test equipment and then it deducts this values from the values of
following measuring cycles.
The reduce the background of the test equipment in case of a reference measure-
ment, the vacuum system of the device is evacuated and vented for three times.
5.4 Commander mode
If the Modul1000 is integrated in a leak detector system, in Commander mode, it can
control the whole test in the integrated chamber. All necessary valves for filling the
test sample with helium as well as the necessary pressure gauge can directly be
connected to the Modul1000. The test run can only include a device for helium recov-
ery.
Optionally, the test can also be carried out in Partial Flow mode to accelerate the leak
detection.