SRS Labs QMS 100 Series, Руководство пользователя

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2-14 RGA Head and Scan Parameters
SRS QMS Gas Analyzer
Note: Changing scan parameters will result in loss of all displayed data on
the screen. Use the File menu to save the data in one of the formats available
before changing any scan parameters.
Changing Head Parameters
The head parameters menu items are available only when there is an SRS RGA Head connected
and turned on. The head parameters are variables that depend on the actual RGA Head and
reside in non-volatile memory in the RGA Head circuitry. These parameters are read from the
Head when a connection is established and vary from one Head to another due to physical
properties, electronic properties, and aging of the unit.
To change or view any of the Head parameters, do the following:
1. Connect to a head using the Connector List setup from the Head menu, or by
clicking on the Connector List button on the toolbar.
2. Select an item from the Head menu.
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.
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.