SRS Labs QMS 100 Series, Руководство пользователя

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General Utilities 2-17
SRS QMS Gas Analyzer
To Enable the Background mode make sure the graph has valid data and the RGA head is
connected. In Analog and Histogram mode the scan must be allowed to finish at the Stop mass
before the data can be used as background. Use the Stop at End command (if in continuous scan
mode) to guarantee this condition.
To Enable the Background:
1. If a scan is in progress, issue the Stop at End command from the Scan menu.
2. Select the Background Setup command from the Utilities menu.
3. Click on the Enable Background Mode check box to enable this mode.
4. Select the desired data subtraction mode.
5. Press OK.
The data gets cleared and the next scan will be the result of subtraction selected.
To Disable the Background:
1. Select the Background command from the Utilities menu.
2. Click on the Enable Background Mode check box to disable this utility.
3. Press OK.
When the background mode is disabled, the old background data reappears on the screen.
General Utilities
Note: For detailed information and command description of the RGA program please refer
to the RGA On-Line Help files provided on the program CD. The RGA help system
includes a detailed description of all the features, procedures and commands available in
the program.
Using the Data Cursors
A real-time graphical cursor is available in all scanning modes. The cursor is on by default in all
modes. When you select the cursor command (Utilities menu) in all modes except the Table or
Annunciator mode a cursor appears on the graph. The vertical cursor can be moved to any point
in the graph to identify the desired data value. In Analog or Histogram modes the cursor values
are displayed in the text box on the right top portion of the graph. The cursor text box is an
active graph object. Thus you can customize the position of the cursor box by selecting it and
dragging it, or you can double-click on it to change the font or the size. The X and Y values of
the cursor are updated every time the cursor is moved, or a new data value is acquired at the
current cursor position.
In the Leak test mode the X value of the cursor text is displayed in time format.