[Dsg-halla_ecal] [New Logentry] Follow-up Re: ECal heater test started

[Marc Mcmullen]

Hi Don,

The specifications for the NI-9264 analog output module for current source are as follows:

4 mA per channel
16 mA for all channels maximum

Each module has 16 channels, supporting 1 power supply per channel
The controls expansion cRIO uses 3 of these analog output modules.

The specification for each power supplies control circuit is listed as “typically 100 uA”. Which is within the specification of the cRIO
module.

Marc





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From: Dsg-halla_ecal <dsg-halla_ecal-bounces at jlab.org> on behalf of jonesdc--- via Dsg-halla_ecal <dsg-halla_ecal at jlab.org>
Sent: Friday, March 7, 2025 7:30:02 AM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: [Dsg-halla_ecal] [New Logentry] Follow-up Re: ECal heater test started

Follow-up Re: ECal heater test started<https://logbooks.jlab.org/entry/4336867>

Lognumber 4336867<https://logbooks.jlab.org/entry/4336867>. Submitted by jonesdc<https://logbooks.jlab.org/user/jonesdc> on Fri, 03/07/2025 - 07:29<https://logbooks.jlab.org/entries?start_date=1741346980&end_date=1741354180&book=HALOG>.

Logbooks:       HALOG<https://logbooks.jlab.org/book/halog>
Entry Makers:   jonesdc
References:     4336856 - ECal heater test started<https://logbooks.jlab.org/entry/4336856>

Power supplies appear to only be able to output about 60% of their expected maximum current. Zone by zone this is not true, but when all zones are on, the current drops. It appears to be a CRIO output voltage issue. The CRIO is supposed to deliver 0-10V to the power supplies to control their current. If the control inputs on the power supplies are drawing more current than the CRIO can output, the voltage will not be able to reach 10V and we suspect this to be the problem. Since the power output goes as the square of current we are likely better off turning off selected zones and increasing output to the remaining. We are turning off 10 zones: 2,5,9,11,13,18,22,24,29,33. This increases the current to the remaining zones allowing them to reach close to maximum.
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