[dsg-svt] Cable/patch panel fix

[Brian Eng]

https://logbooks.jlab.org/entry/3430264

R3S3 LV cable has been repaired, the damaged connector on L1C side was replaced.

R3S4 was a combination of issues, firstly it didn't have either the LV or faraday cage ground connected (despite all voltages being on). Secondly the bottom temp signal was damaged, this connector was also replaced.

I'll do calibration on these modules after sending this email.

Regarding the ambient/environmental sensors, really the only thing left to do is remove the connector and solder the wires. However, in doing so if the barrels ever need to be be separated again, there will be an extremely long pigtail to deal with. Those connectors only seem to have issues when they're being moved, once they're fixed in place and working they seem to be fine.

Some other notes/observations: R2 S6 bottom HV is set to a lower voltage (50V), I'd assume this is expected?
R4 humidity was extremely high (some sensors reading 100%), plus due to the fact that it has coolant flowing but no modules powered the dew point was actually negative for a few sensors. I opened the N2 valve some to get flow in it.
Attached is the logfile from the R3S1 trip.
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Brian Eng
Detector Support Group
757-269-6018

> On Oct 13, 2016, at 2:56 PM, Yuri Gotra <gotra at jlab.org> wrote:
> 
> LV cable R3S3 needs to be repaired, L1C connector. Using the spare for now.
> 
> Patch panel connection for R3S4T and R3S4B bad.
> 
> Environment sensors - flaky connections, next week - last chance to fix before SVT will be reintegrated.
> 
> R1-R3 calibration is in progress.
>