[Primexd] FCAL bad channel status

[Shepherd, Matthew]

> On Nov 28, 2018, at 11:38 AM, Colin Gleason <gleasonc at jlab.org> wrote:

>  The base failure rate had dropped to less than 2 per week by the end of the run, so we should be able to manage replacements through the rest of the Fall run. I think Chris and Nick have been busy with installation, but once that is complete we can get them to repair more bases for the spring.

We should start targeting bases that have high current draw when HV is on and set to operational value but normal current when HV is off.  These are likely to be the same bases that have trouble holding HV at the highest settings.  The symptoms are different from HV drop, but I believe the suspected root cause (poor cleanliness QC by the manufacturer) is the same and I think the documented repair will work.  Let's pull 3-5 of these and have Nick and Chris rework them and see that the operating current is reduced and HV is able to be set high.  If it is, we can gradually begin working through those.

Matt

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4019 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/primexd/attachments/20181128/10a14716/attachment-0002.p7s>