[Dsg-hallb_magnets] [New Logentry] TR8122A Flakey Readout

[beng at jlab.org]

Logentry Text:
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This Cernox has actually been bad since May 2nd, see attached plot.

We tried disconnecting the sensor from the back of the LV Excitation chassis (Chassis #1 J7), the spike to 325 K around 15:00 is the disconnection. This should cause the cRIO to readjust the excitation current (as it targets a fixed 15 mV voltage). The sensor value recovered but continued the oscillation. As the next available connector is on the top of the service tower and is not easily reachable it was decided to continue running as-is until the SAD.

The chimney splice interlock that corresponds to TR8122A was disabled in the PLC. The primary protection for this will be the voltage taps; both the hardware QDs as well as the secondaries on the PLC.

We ramped the magnet to 500A and saw values of ~0.9 mV on both of the chimney splices.

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4304555
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