Stanford Research Systems RGA100, Operating Manual And Programming Reference

Page: 85 / 362

Features and Operation 5-7
SRS Residual Gas Analyzer
Features and Operation
Note:
For detailed information and command description of the RGA program please refer to the RGA
On-Line Help files provided with the program disks. The RGA help system includes a detailed
description of all the features, procedures and commands available in the program.
The RGA Window
The RGA window represents one SRS RGA Head operating in a specific display and
scan mode. The RGA window does not need to be connected to a head at all times. It
can be used to print graphs or to review some old scan logs. You may size, tile,
minimize, or cascade several RGA windows together even while scanning.
When an RGA window is sized, all the graph objects in it are also sized down or up.
For optimum viewing of a graph, maximize the RGA program window, and maximize
the RGA file you wish to view.
Multiple Head Operation
The RGA program can monitor several SRS RGA Heads simultaneously. Each RGA
window represents a separate RGA Head that is controlled independently from any other
window/head combination.
To connect an RGA Head to an RGA window use the Connector List Setup command to
assign a port (that you know is attached to an RGA Head) to that window.
The operation of the RGA program is unchanged whether you have one or several heads
connected and scanning. The only difference you might see is a slowdown in display
updates and that is dependent on the computer hardware you use.
Display Modes
There are seven distinct display modes in RGA along with split modes that consist of
combinations of these modes.
Following are the seven distinct modes:
Analog (Mode Menu )
Analog mode is the spectrum analysis mode common to all Residual Gas Analyzers.
The X-Axis represents the mass range chosen in the Mass Spec Parameters menu. The Y-
Axis represents the ion current amplitudes of every mass increment measured.
Select the Schedule menu to set the scan trigger timing. Once the scan is in progress,
the AutoScale command in the Graph menu may be used to scale the data.
The Analog Trace parameters such as color and width may be changed by either double
clicking on a data point directly (if data is present) or by using the Traces command from
the Graph menu.
In Analog mode the RGA Head scans from the start to the stop mass using the Points Per
AMU variable specified in the Mass Spec Scan Parameters dialog box (the Scan
Parameters… command in Scan menu or the shortcut button of the Parameter button
). This value is used to determine the mass increments between data points. The