[Dsg-halla_magnets] 8/3 Meeting at 11

[Steven Lassiter]

Hi Alls

Updates:

The radial strain gauges are now all connected and roughly calibrated.  They seem to be working okay now.

The axial strain gauges will not be used during the Test Lab cool down and low current testing. The axial gauges would be attached to the bolts going through the end yokes and but the yoke is not being used. We could consider masking or turning off their on the HMI display or at least their red flashing indicators.

The CCR's and HX's PT102 temperature sensors have been roughly calibrated to be at 295K for room temperature. The room temperature resistance offsets have been used for the 77K data point as well.

The CCR Diode temperature sensors have been front end calibrated to read 295K as well. The front end calibration used a sensor offset of -0.033V for each diode but the display only shows -0.03. the third decimal is being used and is importation just not being shown. This is one reason I prefer to do fine calibration within the logic program, but for the temperature sensors front end calibrations will suffice for now.

The Liquid levels inputs have been changed from, 4-20mA to 0-10V signals. A8:ch8 for Helium and A8:ch9 for the LN2. Fine tuning will occur once the probes are cold and when filling can occur.

The wide range vacuum gauge arrived and is in the cabinet. The 4 wire cable (#405-03) for the vacuum gauge needs to be installed and connected to the unit.

Thanks for the efforts
Steven

________________________________
From: Dsg-halla_magnets <dsg-halla_magnets-bounces at jlab.org> on behalf of Brian Eng <beng at jlab.org>
Sent: Wednesday, August 3, 2022 10:42 AM
To: dsg-halla_magnets at jlab.org <dsg-halla_magnets at jlab.org>
Subject: [Dsg-halla_magnets] 8/3 Meeting at 11

Just talked with Steven this morning, this meeting will be cancelled so that we can focus on rewiring the rack.
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