Stanford Research Systems RGA100, Operating Manual And Programming Reference

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5-10 Features and Operation
SRS Residual Gas Analyzer
individual mass query is performed. If a P vs T mass lies outside the
Analog or Histogram mass range, its partial pressure will show a zero value.
A table entry can be easily disabled using the Table Parameters dialog box.
Leak Test (Mode Menu )
Leak Test mode provides the most effective way to study the behavior of a single gas.
This mode provides a scroll graph that monitors the gas trend over a period of time, an
instantaneous partial pressure readout, a bar meter, and an Alarm message. An Audible
beep with a pitch proportional to the partial pressure is also available if a sound card is
installed. If the beep is disabled, an Audio message can be enabled to reflect the status
of the Alarm levels.
The gas mass, name, and scan parameters may be configured from the Scan
Parameters…
command (Scan menu). The Leak Trace, bar meter color, and text readout
color can be edited by double clicking on them directly (if data is present) or by selecting
the Traces command form the Graph menu. Only one color can be selected for all data
objects. The Schedule command (Scan menu) or the shortcut button of the clock figure
may be used to set the scan trigger frequency.
In Leak Test mode, the partial pressure for the specified gas is acquired by querying the
RGA head for that specific mass only. The frequency of data acquisition is set in the
Schedule setup. The time to acquire each partial pressure depends on the scan speed
selected (the plotting speed depends on the user's computer). The Leak Test display
mode cannot be split with other modes.
Annunciator (Mode Menu )
Annunciator mode provides an effective way to visually monitor gas warning levels from
a distance. The graph is composed of large green panels each representing a gas and
alarm level. The partial pressure value is clearly visible and so is the gas name. When
an Alarm level is reached, the panel color changes to bright red and the appropriate
alarm message is shown. The gas masses, names, and parameters can be set using the
Table Parameters command from the Scan menu.
The Annunciator channels can be independently configured. Some channels can use
the Channel Electron Multiplier (CEM) while others can have different scan speed with
the CEM off.
The alarm control and level settings can be edited by either double clicking on the
Alarm text of the desired annunciator entry, or by clicking on the 'Alarm X' (where X is
the channel number) button for the annunciator channel in the Table Parameters dialog
box.
The Schedule command (Scan menu) or the shortcut button of the clock figure
may be
used to set the scan trigger frequency.
The Annunciator display mode cannot be split with other modes.
Important:
Table mode, P vs T mode, and Annunciator mode share the same table scan parameters,