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72 MC4 User Guide
Notes.
You may increase the test time in 30 second steps using the
F2/
+30 s
Function Key. This can be done both before the test is
started and also while the test is in progress.
MC4 uses numbers that have more decimals than are available on
the display. In some cases these extra digits may cause rounding
that differs from values that are shown on display. Notable
differences between shown and manually calculated values usually
mean that MC4's accuracy is not suitable for the given task.
If applicable, disable MC4's auto-off functionality during the test. If
the test lasts longer than the auto-off delay, MC4 is shut down while
the test is still incomplete.
An external pressure module (EXT) connected to MC4 during a
leak/stability test cannot be taken into use in the window were the
leak/stability test is under progress.
Hint.
If you have a pressure transmitter connected to a pressure
measurement system and you want to check the pressure decrease
without altering the pressure connections, do as follows:
Connect the electrical output of the pressure transmitter to MC4. Use
MC4's scaling utility to scale the output signal back to pressure units.
Start the leak/stability test for the scaled measurement and there you
can see the leak in pressure units. More info on scaling in chapter
Scaling on page 86.
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