Chapter 4 System Setup
60 Lynx II DSA User's Manual - 7096089
Input Size
Select the Lynx II’s full memory size. The memory size settings range from 256 to 32768
channels. Note that if the datasource was defined through the MID Wizard, the input size
selected in the wizard becomes the upper limit here.
Computational Presets
Defines a computational preset condition to terminate PHA acquisition. Computational
Presets are available only for PHA datasources. For MCS datasources this option will be
disabled (grayed out).
These presets stop the acquisition when a computed value you specify is reached. When a
computational preset is defined, the selected time preset is still active; the acquisition will
be terminated by the preset condition that is reached first. If you want to use a
computational preset alone, set the time preset to 0 which means “forever”. This ensures
that the computational preset will be reached first.
The Computational Presets are mutually exclusive from each other, but any “one” can be
combined with either a live time or real time preset.
None
Selecting None disables all computational presets. Only the time preset will be used in this
case.
Integral, Area, and Counts
Each of the three computational presets: Integral, Area, and Counts applies to a specified
ROI.
To use any computational preset, you must specify its Value, the ROI's Start Channel, and
its Stop Channel. The Start and Stop Channel values will default to the current
computational preset if there is one, otherwise, the Start value will be 1 and the Stop value
will be the spectrum’s highest channel number.
ROI Selection
You can enter the Start Channel and Stop Channel limits manually or by using the
Current button in ROI Selection or the + and – buttons to move to the next ROI. These
functions automatically replace the limits with the current ROI’s start and stop channels.
Note: ROI Start Channel and ROI Stop Channel values are regarding the PHA input size.
Coincidence
Coincidence is the ability to qualify the recording of incoming events. A qualifying (gate)
signal must arrive within a time window which is selectable by the user.
The gate input signal at the COINC/ANTI connector of the instrument's rear panel
determines which incoming signals are recorded. Events that do not meet the qualification
requirements are not recorded.
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