Experimental Physics and
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<== Date ==>		<== Thread ==>

Subject:	XSPRESS3 / InternalTrigger / AcquireTime
From:	John Dobbins via Tech-talk <tech-talk at aps.anl.gov>
To:	EPICS Tech Talk <tech-talk at aps.anl.gov>
Date:	Wed, 26 Aug 2020 13:59:47 +0000

All,

FYI.

I noticed that on the xspress3 with internal trigger selected the AcquireTime rolls over for times greater than ~ 53 seconds.

The ADC sample time is 12.5 nS. It appears the AcquireTime is converted to a 32-bit integer of ADC samples. 12.5nS * 2^32 = 53.7 seconds.

Setting an AcquireTime of 60 seconds generates an exposure of ~ 7 seconds.

Apologies if this is reported elsewhere and I missed it.

John Dobbins

Research Support Specialist

Cornell High Energy Synchrotron Source

Cornell University

Maybe it's all part of a great big ineffable plan. - Neil Gaiman, _Good Omens_

Replies:: Re: XSPRESS3 / InternalTrigger / AcquireTime Matt Newville via Tech-talk

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ANJ, 26 Aug 2020