INFICON Protec P3000(XL) Helium Leak Detector - Manual (Page 20)

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General Information
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1.4.2 Definition of Terms
Main menu
This menu is shown first after operating the Menu push-button.
Sub-menus
Comprise all menus which may be accessed from the main menu. Unauthorised
changes to many of these sub-menus may be prevented by a password (see also
Section
4.3.1 ).
Menu item
A single menu line.
Default condition
Status of the Protec P3000 when supplied from the factory.
Service menu
Comprises the menu lines in the “Service” sub-menu. The service menu is accessed
by scrolling in the basic menu using the navigation push-buttons (see also Section
3.2 ).
Autozero
Determination and compensation of the helium background. With this function, the
internal ZERO level of the leak rate signal is determined in order to avoid a readout
of the internal helium background and mistaking it as a properly measured value. If
subsequently negative leak rates are obtained due to this correction, the stored offset
values are changed so that ZERO will be the lowest value which can be obtained. In
this way the values adapt automatically to a decaying background (adaptive
background correction).
Internal background
The existing partial pressure in the measurement system. The level of the internal
background is measured all the time and subtracted from the measured signal.
I•Guide Mode
In the I•Guide Mode different testing plans can be pre-programmed. During testing
the operator is then constantly prompted for the next action and thus guided through
the testing plan.
Unit under test
Test object that needs to be leak checked.
Display limit
Limits the measurement data displayed depending on the unit of measurement and
the operator settings.