Bill Lavender wrote:
On Fri, Mar 12, 2004 at 10:25:26AM +0100, D. Peter Siddons wrote:
What aproaches are people taking to performing on-the-fly scans? What I
mean is, a scan in which one launches a motor move and reads a detector
as the motor is moving, rather than the more typical step-scan.
Pete.
If you are using a multichannel scaler to record your detector counts,
you just need to generate some signal that depends on the motor position
that your multichannel scaler can record.
...
Under EPICS, I have used the Struck SIS3801 multichannel scaler with
good results using the EPICS MCA record. The only problem with it has
been that it is limited to a maximum of 4000 points by the version of
the MCA record that I have. If there is a newer version of the MCA
record that no longer has this restriction, then I would be interested
in hearing about it.
Bill Lavender
Illinois Institute of Technology
[email protected]
+1-510-612-4747
Under EPICS 3.14, I've acquired up to 64000 points with the setup you're
describing. The actual limit should be much higher than this -- something
hilarious, like 2 billion -- but I haven't gotten more than 64000 out to a
CA client. There may be some unsigned short integers hanging around where
they're no longer wanted.
--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab
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