[Halld-cal] [Revised Logentry] FCAL HV scan

[gasparan at jlab.org]

  Hi Sasha,

 a very good test. It looks like we may have serious problems if we need
 to set 1800 V range.
 We will need to have more information (gains, electronic noise, ...)
 before making some decision.

 Thanks,
 Ashot


>
> Logentry Text:
> --
> FCAL readout: RAW mode (mode 10)
>
> Use violet LED, 500 Hz
>
> 1500 V
> ----------
>
> Run  51604,  130 K events,  17 V
> Run  51605,  122 K events,  22 V
>
> 1550 V
> ---------
>
> Run 51606,  120 K events, 17 V
> Run 51607,  120 K events,  22 V
>
> 1600 V
> ----------
>
> Run 51608, 17 V
> Run 51609,  22 V
>
> 1650 V
> ----------
>
> Run 51610, 17 V
> Run 51611, 22 V
>
> 1700 V
> ----------
>
> Problems with setting HV on channel (22,22 ;  -8,-8)
>
> Run 51612,  17 V
> Run 51613,  22 V
>
>
> 1750 V
> ----------
>
> Not able to set this voltage on the following channels:
> Channel, Read back voltage
>
> (1, 31) 1610 V
> (7, 46) 1601
> (13, 23) 1618
> (13, 47) 1651
> (20, 26) 1600
> (22, 22) 1607
> (25, 26) 1620
> (29,7) 1640
> (33,47) 1609
> (35, 37) 1630
> (44, 30) 1590
> (41, 39) 1660
> (44, 30) 1590
> (47, 38) 1625
> (49, 31) 1612
>
> Run 51614,  17 V
> Run 51615,  22 V
>
> 1800 V
> ---------
>
> Cannot set HVs on 41 channels
>
> Run 51616,  17 V
> Run 51617,  22 V
>
>
>
>
>
>
> ---
>
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