[Sbs_gems] [New Logentry] GEM work on J0

[hszumila at jlab.org]

Logentry Text:
--
This morning with Controlled Access, I improved the LV connector at the patch (bringing the right connector with me to re-crimp the wire and attach). This didn't change the problem that after APV configuration, the current draw is too low (~7.18A vs 7.45A). mpdLibTest looks fine. Inspected the LV cable at the GEM, but I couldn't really access the backplanes to readout the LV there (I assume this should not have changed). The LV at the patch seems fine (3.75V). I also checked HDMI cables. I did put J0 LV on the patch that was setup for J2 to sanity check, and we got the same results. I also disconnected and reconnected the LV lines at the detector with no change in the results.

I will mention that, at the moment, I've left J0 coming from the J2 line from the LV supply. 

Took a pedestal run 12444. Overall, it appears that the pedestal in J0 is a bit higher than previous pedestal runs (~12 adc compared to ~10). 

While the common mode seems to have drifted higher in J0 over the past week, there is no obvious sign as to where to look at the problem. 

---

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/3953952
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/sbs_gems/attachments/20211201/6ff76800/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: application-pdf.png
Type: image/png
Size: 346 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/sbs_gems/attachments/20211201/6ff76800/attachment-0001.png>