INFICON Helium Leak Detector Modul1000 Interface description - Manual (Page 15)

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3.5 Calibration
Two different kinds of calibration can be called via „*CAL“:
3.5.1 Internal Automatic Calibration
When the leak detector is in STAND-BY mode the command „*CAL“ evokes an
internal autmatical calibration.
The process is completely automatically.
Via „STATus:CAL?“ the computer can realise if the calibration routine is finished.
3.5.2 External Calibration
When the leak detector is in measurement mode the command „*CAL“ evokes a
calibration routine for external calibration.
Before starting the external calibrated leak has to be opend and the leak rate signal
has to be stable.
Via the command „*STATus:CAL?“ the computer can detect when the external
calibrated leak has to be closed.
When the external calibrated leak is closed and the leak rate signal stable the
computer has to advise the leak detector via a second command „*CAL“.
Via the command „*STATus?“ the computer can recognize when the calibration
routine has finished.