Option
Defines the type of computation preset. Options are None or Integral. Use None to
disable computational presets.
An acquisition that uses Integral uses the Start and End Channels to define a re
-
gion to integrate. Integral computes to an integral order within a computational preset
region. The acquisition stops when the integral value of that region matches the Limit
that you also specify.
Choose Integral to use this option; you must also apply Limits as appropriate.
Limit
With Integral selected, you may set this computational preset limit. You may limit
the number of counts (determined by the number of counts between the Start Chan
-
nel and End Channel) to this preset in order to stop the acquisition.
Note There will be some overlap in integral value. Acquisition will be stopped
when the integral is exact, however some additional counts will likely regis-
ter in the MCA display.
Time Presets
Time Presets are available when the Acquisition Mode is set to PHA, MSS,
LIST, TLIST or DLFC. Refer to MCA Settings | Inputs for Acquisition Mode op-
tions.
A Time Preset is used to stop an acquisition after that preset duration has elapsed.
Note
When both computational and time presets are defined, the Acquire Stop
command is issued by the preset that is reached first. If you want to use a
time preset alone, set the computational preset to None.
Option
Two Time Preset options are offered, plus None.
•
Live Time is the actual time the circuit is able to detect events.
•
Real Time is the elapsed time since the acquisition was started.
Select None to NOT use a preset, and acquire data until it is manually stopped.
Limit
With the time preset selected, enter the Limit value. Acquisition will stop when the
value is reached. If Real Time or Live Time are selected, enter in a time Limit value.
User’s Manual 79
Acquisition Setup | Limit MCA Settings
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