[Dsg-hallb_magnets] [New Logentry] Follow-up Re: TR8122A Flakey Readout

[Probir Ghoshal]

Dear Brian, Morgan,

Thanks for helping and identifying the problem.
I am okay and really happy to see that is the troubleshooting we need to do on LV chassis and nothing wrong in the magnet or with the sensor.

Brian had the plan to get this fixed as soon as he can find the replacement option.

Regards
Probir
________________________________
From: Dsg-hallb_magnets <dsg-hallb_magnets-bounces at jlab.org> on behalf of beng--- via Dsg-hallb_magnets <dsg-hallb_magnets at jlab.org>
Sent: Wednesday, May 22, 2024 1:40 PM
To: dsg-hallb_magnets at jlab.org <dsg-hallb_magnets at jlab.org>
Subject: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: TR8122A Flakey Readout

Follow-up Re: TR8122A Flakey Readout<https://logbooks.jlab.org/entry/4308937>

  *   Edit<https://logbooks.jlab.org/entry/4308937/edit?destination=email/send>
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Lognumber 4308937<https://logbooks.jlab.org/entry/4308937>. Submitted by beng<https://logbooks.jlab.org/user/beng> on Wed, 05/22/2024 - 13:35<https://logbooks.jlab.org/entries?start_date=1716395705&end_date=1716402905&book=DSGLOG&book=HBTORUS>.

Logbooks:       DSGLOG<https://logbooks.jlab.org/book/dsglog> HBTORUS<https://logbooks.jlab.org/book/hbtorus>
Entry Makers:   ghoshal, mcookiv
References:     4304555 - TR8122A Flakey Readout<https://logbooks.jlab.org/entry/4304555>

We first tried disconnecting and reconnected fro the back of the LV chassis, readout was still bad.

Morgan and Probir accessed the top of the service tower to clean/reseat the connectors at the top, still bad.

Finally we tried moving the connector to a different channel on the same LV chassis just to see what would happen, readout stopped alternating between two values like it was previously. The temperature was wrong, but that is expected as it was now using the wrong sensor calibration.

Further troubleshooting to follow ... first step will be to find spare boards used in the LV chassis and just try swapping those out.

Explanation of the numbers in the attached plot.

1 = Disconnected J7 from back of Chassis #1
2 = Morgan disconnected from top of Service Tower
3 = Disconnected again and additional cleaning from top of Service Tower
4 = J7 and moved on to J6 (see swapped plot)

[https://logbooks.jlab.org/files/styles/plentybig/public/2024/05/4308937/tr8122a.png]
[https://logbooks.jlab.org/files/styles/plentybig/public/2024/05/4308937/tr8122a%20swap.png]
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