[Primex] ROC4

[Ashot Gasparian]

   Pawel,

   That is a good progress on this long standing problem for us.

   I would suggest to replace the power supplies on this crate
   as sooner as it is possible, that is on Monday.

   Ashot


.............................................................
Ashot Gasparian                    Phone:(336)285-2112 (NC A&T)
Professor of Physics
Physics Department                       (757)-269-7914 JLab
NC A&T State University              Fax:(757)-269-6273 JLab
Greensboro, NC 27411               email: gasparan at jlab.org
.............................................................


On Fri, 17 Sep 2010, Pawel Ambrozewicz wrote:

> Hello,
>
> ROC4 power supply was checked by Bill Gunning.
> There is subtantial (10%) noise on all voltages modules
> of this power supply. It turns out that the crate
> doesn't have the ground on any of them, unlike two
> other ROCs.
>
> There are three options to pursue,
>
> 1. upgrade the power supply (modify
>    the wiring),
> 2. swap the power supply,
> 3. change entire crate,
>
> Bill promised to help with anything
> we decide. He might be available Monday,
> or Tuesday for sure.
>
> My take on it is that we should replace
> the power supply alone. Bill suggested Wienner,
> but there are no spares of those.
> I'm awaiting a reply from him if BiRa would do.
>
> Regards,
> Pawel
>
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