Stanford Research Systems RGA100, Operating Manual And Programming Reference

Page: 93 / 362

RGA Head and Scan Parameters 5-15
SRS Residual Gas Analyzer
If the operation is not canceled, the new parameters are stored in the Head and are used
in subsequent operations.
Changing Scan Trigger Rates
The scan trigger rate (schedule) determines the frequency with which a scan is repeated.
Not all display modes have the same schedule options. When changing trigger rates
keep in mind the following:
• When a graph with a time axis is active, only timer triggered schedule is allowed.
•
When a split mode is active, the graph with the more restrictive schedule is used for
triggering scans.
•
If a selected trigger period is smaller than the actual period of the scan, RGA will
change the trigger period to the minimum value.
To change the scan schedule for a mode do the following:
1. Connect to an RGA Head.
2. Select the desired display mode.
3. Select the Schedule command from the Scan menu or by clicking the shortcut button
of the clock figure.
4. Select the trigger mode or rate you want.
IMPORTANT:
Since Windows can be running one of many applications at once, it is possible for the
RGA program to miss a scan trigger while other applications are busy performing other
tasks such as printing or file copying. These facts should be taken into account if
optimum performance is desired when using Timer Triggered modes and display modes
that use a time axis.