[Primexd] [Revised Logentry] CCAL dividers replaced

[somov at jlab.org]

Logentry Text:
--
We have replaced seven suspicious CCAL dividers, which  have large non-linear response an large energies.

Column/Row   New divider ID

(-6, 5)     B76275_0028_R 
(-4, 4)                        29
(-4, 6)                        27
(4, -2)                        26
(5, -5)                        01
(-2, 6)    B76276_008_R 
(-6, -4)                   26

After replacing these dividers, we found a problem with one more divider in the 
module (-4, -2). These module was Ok during data production .The signal amplitude induced 
by an LED in this modules was small, about 15 mV. The gain seemed to be reduced by a factor 
of 10 (probably there are problems with the amplifier). After replacing this divider the 
signal LED amplitude became normal.

-------------------

We found that the detector translation table in the CCDB was wrong. It was not copied properly 
from the table, which we used in December 2018. It will be fixed.

---------------------

FADC baseline for the module 6,1 was slightly shifted (120 fadc counts), we need to keep an eye 
on this channel.



 



 

---

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/3649095
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/primexd/attachments/20190208/9db657b8/attachment.html>