Chapter 4 System Setup
38
Lynx DSA User's Manual - 9240227J
Detector Type
Use this drop down list to select the type of detector to be used with this MCA; this
also assigns appropriate default values to the spectrum display and analysis
parameters. Five choices are available:
Gamma or X Ray - Ge
,
Gamma or X Ray -
NaI
,
Gamma or X Ray - Si
,
Alpha or Beta Particle - Si
, or
Other
. For additional
information please refer to the
Genie 2000 Operations Manual
.
Out of Service
This check box allows you to place this Input temporarily “out of service”. That is, it
will remain as an entry in your MCA Definition File but will not be available for data
acquisition. It is meant to be used when the MCA or its front end electronics are
temporarily disconnected.
Memory Groups
This check box allows you to define up to two memory groups, each with an input
size equal to the selected number of channels, which are 32768 by default. At run-
time, acquisition can be directed into either group simply by pre-selecting the group
number before starting acquire. Additionally, the input size can be changed at run-
time to a value ranging from 256 to 32768 channels.
Each group has its own independent start time as well as independent elapsed times
for PHA groups, or sweeps for MCS groups.
Saving the Input Definition
After completing a definition, use the MID Editor’s
File
|
Save
(or
Save as
)
command to save the Definition file.
As a reminder, you’ll see an asterisk (*) next to the name of the current definition in
the Title Bar when a changed definition has not been saved.
CAUTION
:
If you change an existing Input Definition, saving it will set its
calibrations to default and will clear the Acquisition Start
time.
The File Descriptor
When a Definition is saved for the first time, the Save As file dialog box is
automatically opened. In that dialog box, you’ll see a File Descriptor field, which lets
you store a 32-character description with your file to make it easier to locate when
you want to use it again.
