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<== Date ==> <== Thread ==>

Subject: Cosylab MicroIOC/BLM Calibration procedure confusion
From: Josh Stein <stein@aps.anl.gov>
To: tech-talk@aps.anl.gov
Date: Wed, 25 Apr 2012 12:02:08 -0500
Greetings all,

I have a question needing rapid response - hence my wasting tech-talk bandwidth instead of contacting Cosylab directly (which I will do also). I have a Cosylab BLM system consisting of one of their MicroIOCS and a Bergoz detector. One of the procedures to follow when first using this system is a calibration involving setting two trimmer potentiometers.

In the (Cosylab) manual, they refer to setting the output of a particular detector 'side' to 10KHz - however all of the PVs for that device talk in "Counts". I'm not sure how to do a proper calibration when all the software returns are counts per time-slot.

For now, I just changed my time-slot to 1ms (about the longest duration possible) and adjusted the potentiometers to readback a value of (close to) 10 (figuring that 10 counts in 1ms = 10,000 counts in 1 second). This was pretty difficult - I feel as if I am dangerously close to an 'edge' of the trimmer pot and therefore in a non-linear region. Needless to say, I am not confident I have done this correctly.

Does anyone out there have experience with this system? We have an opportunity today to do some experiments - hence my somewhat frantic email.

TIA,
--Josh


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