<!-- Title: 14:47:26  Mon Feb 26 2001 -->
<!-- Crewchief: Stefano Zucchelli -->
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<!-- Notes: -->
<pre>This is the PLUG HV system E-log. Please write your name and please write in english </pre>


<!-- Date: Mon Feb 26 16:12:12 2001 -->
<pre>In order to make sure everything was ok before I leave Fermilab, 
I did check for masked channels. To my surprise I noticed there are two channels masked :  
Crate 10,  Slot 5,  Ch.s 20 and 22 
I did check on the voltage settings of these channels but they look ok to me.  
So I paused the monitoring and cleared the masking tags on these channels.  
The program ask me to save the new configuration on file. 
To be safe I saved the new settings on a file called : FCrate0112feb2601.txt 
Then I stopped the monitoring and restarted it by pretending it reads the settings  
from the new configuration file. 
 
Expert action was not enabled so I had to first to enable it. 
 
Following instructions I checked parameter consistency. It is OK 
So I restarted the monitoring . All green again , all OK. 
So I did stop once again the monitoring in order to update the  
configuration file. 
I renamed the old configuration file as : FCrate0112feb2601.txt . 
Then I renamed the new configuration file as FCrate0112.txt. 
Finally I restarted the monitoring pretending it reads from the  
usual FCrate0112.txt file. 
Auto diagnosis was ok and also the parameter consistecy was ok 
So I restarted the monitoring. 
 
I disabled expert action.  
 
I kept the old configuration file, now named FCrate0112feb2601.txt 
but it should probably be erased.  
Should talk to Luciana to know what she thinks about this.</pre>
<!-- Author: stefano -->


<!-- Date: Mon Feb 26 16:50:50 2001 -->
<pre>I checked the HV cards that were replaced by Giorgio Apollinari and myself  
during the month of february 2001. 
The follwing cards, as noticed, have troubles :  
 
S.N. 1 (removed by Crate 2,Slot 4) has a broken channel: ch # 10 
S.N.44 (removed by Crate 3,Slot 4) has a bad(O.V.)channel : ch # 23   
( But Giorgio noticed that also ch.s 15 and 22 were faulty while I do not see it. Why ?  
Again a cable grounding problem ??? ) 
 
Also : 
S.N. 56 has ch. 23 in overvoltage, of 5-7 volts only, but still an overvoltage. 
So I decided that these three cards must be shipped back to CAEN for repairs. 
The other cards that I shipped from Bologna at the beginning of february 01 are ok. 
 
SPARE Status : at the current date 5 spare cards are available at 
Fermilab. There are located on the shelf in front of the 3d floor PC.</pre>
<!-- Author: stefano -->


<!-- Date: Mon Feb 26 18:09:04 2001 -->
<pre>I installed the repaired optodecoupler card in the front panel of the spare  
crate sitting in 3d floor ( crate S.N. E219 ). 
I checked if is working after installation . It works ok ! 
Now this crate is ready to go in the pit if ever needed, hopefully not. 
</pre>
<!-- Author: stefano -->


<!-- Date: Tue Feb 27 10:01:09 2001 -->
<pre>This morning I shipped the three faulty cards to Italy. 
A new carrier will be used this time since DHL and/or Fed Exp are 
always giving us trouble at the reception of material in Italy. 
Let's see if this is gonna work. </pre>
<!-- Author: stefano -->


<!-- Date: Tue Feb 27 10:30:08 2001 -->
<pre>I found the PC off. Mark Knapp and other peoples are working on the Fermilabdomain and they shutted off the server.  
I had to reset the PC manually to get the PC running again. Hopefully this will not happen in the future.  
Tonight Pompos is planning to do sourcing. 
I will try to leave things on if I can, but I will leave in an hour from now and half of the Plug is not getting AC power, 
It means they are still working on it. I will go now in the tunnel to 
see what's happening, than I have to leave.</pre>
<!-- Author: stefano -->


<!-- Date: Fri Mar 2 14:12:59 2001 -->
<pre>PEM and PHA, east and west HV turned off for work on detector. 
Time off: 1412/02Mar2001 
 
                                        -- Willis and Howard</pre>
<!-- Author: Willis -->
<!-- Comment: Fri Mar  2 17;33;55 comment by...Willis -->
<pre>Finished work on detector. Restored HV to all plug systems.
Time on: 1732/02Mar2001

                                       -- Willis and Howard</pre>


<!-- Date: Tue Mar 6 10:17:21 2001 -->
<pre> 
Channel 13 on Crate 11 and Slot 6 found OFF. 
Since in the Log file I didn't find any Switch off done by an operator try to switch it ON.</pre>
<!-- Author: Luciana -->


<!-- Date: Thu Mar 8 12:54:14 2001 -->
<pre>Tomorrow, from 3 up to 7 in the morning, 
I would like to test the last release of the 
hv control program, I will also 
load new hv values on CAEN Crates 
replacing some wrong values pointed out 
by Willis. Thanks.   </pre>
<!-- Author: Luciana -->


<!-- Date: Tue Mar 13 07:53:36 2001 -->
<pre>Software tests of Monitoring System up to 9 in the morning. 
Crate 12 is not reachable.</pre>
<!-- Author: Luciana -->


<!-- Date: Wed Mar 14 09:12:08 2001 -->
<pre>Doing access into collision hall to check out HV crate 12</pre>
<!-- Author: Willis -->
<!-- Comment: Wed Mar 14 11;57;49 comment by...Willis -->
<pre>Crate 12 was not responding to commands from HV control program.
Found that "check passed" status light was off. Recycled 110 VAC
power on and off several times. For the first few times, the
check passed light went on and a few minutes later went off.
It stayed on after the last power cycle. Luciana suspects that
the TTL communication opto-coupler board may be having
intermittent problems (this has happened in crate 12 before).

Crate 12 now responds to the HV control program. Voltages
to all crates have been put to their set voltages and are
read back voltage is within tolerance.

                                     Luciana and Willis
</pre>


<!-- Date: Sun Mar 18 21:35:10 2001 -->
<pre>Alarms from crates 1, 2 and 11: channels in overvoltage which have been turned off: 
 
CR01, SI5, SN113, CH23  
CR02, SI4, SN51, CH23 
CR02, SI5, SN20, CH23 
CR11, SI5, SN12, CH23 
 
these channels have not been masked off (I don't have the expert password). 
 
Mail sent to Zucchelli, Sakumoto, Lindgren</pre>
<!-- Author: andrea castro -->


<!-- Date: Mon Mar 19 14:03:39 2001 -->
<pre>Collision Hall supervised access:  20Mar2001/0730hrs to 
                                   21Mar2001/1200hrs 
 
   1) The plugs are being close during this access, so the 
      plug HV should be turned off because the AC power will 
      be going on and off 
   2) The plan is to bring down the plug HV at 0830 or 0900 hrs 
      (US/CST) on 20Mar2001 and to leave it off until the end of 
      this access.</pre>
<!-- Author: Willis -->


<!-- Date: Tue Mar 20 09:11:09 2001 -->
<pre>Supervised access 
 
1) Set plug hv to all detectors to "off" 
2) "Stopped" Hv monitor 
                                         -- Howard and Willis</pre>
<!-- Author: Willis -->


<!-- Date: Wed Mar 21 15:33:44 2001 -->
<pre>HvServer, hvClient restarted. 
HV to all systems turned on.</pre>
<!-- Author: Willis -->


<!-- Date: Thu Mar 22 18:12:50 2001 -->
<pre>Got an alarm from the plug high voltage, crate 11, so I went  
upstair tto cdfephv: there was indeed one channel in overvoltage   
(CR11, SI4, SN5, ch19, V=739.4, VCAEN=718.0) which triggered   
the alarm. the following monitoring pass showed no overvoltage  
for that channel.  
</pre>
<!-- Author: andrea castro -->


<!-- Date: Fri Mar 23 06:56:39 2001 -->
<pre><br><b>Crate 11 problem channels:</b> 
<br> Continue to have trouble with two HV channels. 
<pre> 
  crate  si  sn  chan 
  ------------------- 
    11   14  22   13 
    11   14  22   19 
</pre> 
See <a href="/cgi/internal/elog/elog.pl?nb=2001&action=xe&page=142&time=19:47:09">shift e-log</a>. 
<br></pre>
<!-- Author: R.J. Tesarek -->


<!-- Date: Fri Mar 23 07:41:45 2001 -->
<br><b>HV crate 11 problems:</b> 
<br>Continuing problems with the plug HV system.  Below is a 
summary of information found in the shift e-log. 
<ol> 
 <li>crate 11, SI=4, SN=5, CH=19:  
<a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=142&time=18:10:23">shift e-log.</a> 
 </li> 
 <li>crate 2, SI=4 CH=00,02; SI=5, CH=16,19:   
<a 
href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=142&time=18:35:34">shift e-log.</a> 
 </li> 
 <li>crate 11, SI=4, SN=22, CH=13,19:   
<a href=" /cgi-bin/elog.pl?nb=2001&action=copyentry&page=142&time=19:47:09">shift e-log.</a> 
 </li> 
 <li>crate 11, SI=4, CH=00,02,10,19; SI=5, CH=13,17,19: 
<a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=142&time=23:55:04">shift e-log.</a> 
 </li> 
 <li>HV trip (<i>suspect usual overvoltage problem -- RJT</i>): 
<a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=143&time=01:15:26">shift e-log.</a> 
 </li> 
 <li>Non audio alarm: 
<a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=143&time=01:28:15">shift e-log.</a> 
 </li> 
 <li>Audio alarm, information content: 
<a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=143&time=04:12:09">shift e-log.</a> 
 </li> 
</ol> 
Many of the above alarms appear to be short lived in nature 
(spontaneously appearing and disappearing) and most appear in 
crate 11.  The message "HIHI" is not so useful for a display. 
Could the iFIX message be changed to something like: 
<br><b> 
"Overvoltage: CR=11,SL=05,CH=07: read=1928V; set=1800V." 
</b> 
<br> 
This would provide the shift crew with more information which 
would aid in identifying the problem so that it can more easily 
be debugged.  Similar, appropriate messages might be made for different error/warning/alarm conditions. 
<br>
<!-- Author: R.J. Tesarek -->


<!-- Date: Fri Mar 23 12:55:38 2001 -->
<pre>Shutting down and restarting server and client 
to restart iFix.</pre>
<!-- Author: Willis -->


<!-- Date: Sun Mar 25 17:53:03 2001 -->
<pre>Plug, crate 11 wedge 15 and 16 went in alarm condition "notOn" 
- does it mean tripped ? 
The leftmost bar on the "High Voltage Summary" page 
went half-height and both bars were red. 
I paged Willis, he instructed to turn off and on again 
the  Plug HV. After that the alarm cleared.</pre>
<!-- Author: Saverio -->


<!-- Date: Sun Mar 25 19:21:47 2001 -->
<pre>Birds from SH crate 11 woke me up.  
The alarm recovered spontaneously </pre>
<!-- Author: Saverio -->
<!-- Comment: Sun Mar 25 19;22;48 comment by...Sav -->
<pre>Reason was overvoltage, crate 11. rightmost bar was above the line.</pre>


<!-- Date: Sun Mar 25 19:32:38 2001 -->
<pre>It happened again. 
same crate and same everything. 
We need a scarecrow.</pre>
<!-- Author: Sav -->


<!-- Date: Sun Mar 25 19:57:43 2001 -->
<pre>Birds again. PSH C11 - recovered</pre>
<!-- Author: Sav -->


<!-- Date: Sun Mar 25 22:18:41 2001 -->
<pre>Birds, both HA and SH, crate 11 
Recovered</pre>
<!-- Author: Saverio -->


<!-- Date: Sun Mar 25 23:18:22 2001 -->
<pre>Birds migrated from East to West. 
Now Crate 4 SH has overvoltage. Spontaneously recovered</pre>
<!-- Author: Saverio -->


<!-- Date: Sun Mar 25 23:44:41 2001 -->
<pre>Overvoltage birds went back to the east, crate 11 SH</pre>
<!-- Author: Sav -->


<!-- Date: Mon Mar 26 09:20:29 2001 -->
<pre>PHA HV trip: CAEN crate 5, slot 3, channels 16-19. 
             I reset these channels.</pre>
<!-- Author: Willis -->


<!-- Date: Mon Mar 26 21:08:03 2001 -->
<pre><b>Summary for the HV plug problems (Mar 24th-25th)</b> 
 
It  looks like the sound alarm for PHA/PSH goes almost every 
hour. The system recovers by itself within a couple of minutes. 
The problem is always in crate 11 (although one ace reported on 
crate 2 too).  
Aparently, some unusual behaviour was observed with the heart-beat that was turning purple. It would also recover by itself back to green. 
Here are the links of all the e-log entries that concearn PHA/PSH.:</br> 
1.Overvoltage Alarm PHA and PSH. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=18:30:41'> 
e-log </a></br> 
2. Overvoltage Alarm PSH.<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=19:24:07'> 
e-log </a></br> 
3. Overvoltage PHA. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=20:44:27'> 
e-log </a></b> 
4. Overvoltage PSH. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=21:40:37'> 
e-log </a></br> 
5.Overvoltage PHA and PSH. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=21:53:20'> 
e-log </a></br> 
6. Overvoltage PSH. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=145&frame=2&anchor=23:26:32'> 
e-log </a></br> 
7. More alarms...<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=146&frame=2&anchor=01:10:16'> 
e-log </a></br> 
8.Overvoltage PHA. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=146&frame=2&anchor=03:10:14'> 
e-log </a></br> 
9. PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=146&frame=2&anchor=05:25:20'> 
e-log </a></br> 
10. PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=146&frame=2&anchor=06:48:34'> 
e-log </a></br> 
11.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=146&frame=2&anchor=07:23:02'> 
e-log </a> </br> 
12. PHA and PSH alarm.  <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=147&frame=2&anchor=09:14:21'> 
e-log </a></br> 
13. PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=147&frame=2&anchor=11:54:50'> 
e-log </a></br> 
14.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=147&frame=2&anchor=15:23:48'> 
e-log </a></br> 
15. PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=16:43:47'> 
e-log </a></br> 
16. PHA alarm.(Here you might have out of range value for IFix).<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=17:38:19'> 
e-log </a></br> 
17.PSH alarm.<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=17:49:23'> 
e-log </a></br> 
18. PHA alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=18:14:00'> 
e-log </a> </br> 
19.PHS alarm (this time crate 2?!)<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=19:07:20'> 
e-log</a></br> 
20.PSH "heart trouble".<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=20:04:47'> 
e-log </a></br> 
21.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=20:14:39'> 
e-log </a></br> 
22.PHA alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=20:44:19'> 
e-log </a></br> 
23.PHA alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=20:51:27'> 
e-log </a></br> 
24. PHA and PSH alarms. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=21:27:12'> 
e-log </a></br> 
25. PHA lost heartbeat. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=148&frame=2&anchor=21:57:32'> 
e-log </a></br> 
26. PHA alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=08:39:30'> 
e-log </a></br> 
27. PSH alarm.<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=09:27:00'> 
e-log </a></br> 
28. PHA alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=09:55:53'> 
e-log</a></br> 
29.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=10:19:43'> 
e-log </a></br> 
30.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=11:05:59'> 
e-log </a></br> 
31. PSH and PHA alarms. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=11:55:44'> 
e-log </a> 
32. PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=150&frame=2&anchor=14:24:09'> 
e-log </a></br> 
33.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=16:31:06'> 
e-log </a></br> 
34.PHA alarm.<a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=17:47:22'> 
e-log </a></br> 
35.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=19:19:23'> 
e-log </a> </br> 
36.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=19:55:56'> 
e-log </a></br> 
37.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=23:16:08'> 
e-log </a></br> 
38.PSH alarm. <a href= 
'/cgi/elog/elog.pl?nb=2001&action=view&page=151&frame=2&anchor=23:43:56'> 
e-log</a>    
                  </pre>
<!-- Author: marina -->


<!-- Date: Mon Mar 26 21:54:52 2001 -->
<pre>Birds from PSH crate 11.</pre>
<!-- Author: Christoph Paus -->


<!-- Date: Wed Mar 28 21:17:24 2001 -->
<pre>Due to the numerous plug hv overvoltage alarms to slow controls, 
I turned off the plug HV monitor client program on the 3rd 
floor PC.</pre>
<!-- Author: Willis -->


<!-- Date: Fri Mar 30 08:57:38 2001 -->
<pre>All 12 HV crates are now in REMOTE on/off mode and can be 
controlled by the remote on/off switch box. 
 
                                  -- Luciana and Willis</pre>
<!-- Author: Willis -->


<!-- Date: Wed Apr 11 10:43:45 2001 -->
<pre>Steve Hahn and I hooked up the 110 vac outlet powering CAEN 
HV crate 11 to a line voltage strip recorder to detect voltage 
spikes. The recording was from 0700 to 1000 hrs (CST/USA) 
on 11 Apr 2001. Over that time period, there were no voltage 
spikes recorded on the strip chart. During the same period, 
Crate 11 channels did have a few overvoltage incidents, but 
the overall overvoltage rate was rather low. 
 
Conclusion: The 110 vac line power is quite clean for crate 11, 
            and the overvoltage readings are from some other 
            source.</pre>
<!-- Author: Willis -->


<!-- Date: Fri Apr 13 01:16:18 2001 -->
<pre>PEM West E-CAL crate 01 No communication with CAEN</pre>
<!-- Author: Saverio -->


<!-- Date: Fri Apr 13 01:36:48 2001 -->
<pre>Both PHA and PSH Overvoltage crate 11</pre>
<!-- Author: Sav -->


<!-- Date: Fri Apr 13 01:56:04 2001 -->
<pre>East HCAL crate 11 OvV: 2</pre>
<!-- Author: Sav -->


<!-- Date: Fri Apr 13 02:29:58 2001 -->
<pre>PSH unspecified birds</pre>
<!-- Author: Sav -->


<!-- Date: Fri Apr 13 06:23:14 2001 -->
<pre>Morning birds on PHA. Not in the alarm Summary.</pre>
<!-- Author: Saverio -->


<!-- Date: Fri Apr 13 06:52:44 2001 -->
<pre>PHa birds, unspecified.</pre>
<!-- Author: Saverio -->


<!-- Date: Fri Apr 13 07:35:40 2001 -->
<pre>morning birds, East HCal, crate 11 overvoltage 4</pre>
<!-- Author: sav -->


<!-- Date: Fri Apr 20 10:03:29 2001 -->
<pre>Birds PHA crate 11 right now. 
</pre>
<!-- Author: Saverio -->


<!-- Date: Fri Apr 20 11:03:33 2001 -->
<pre>Birds, plug Had, crate 11 
Gone.</pre>
<!-- Author: Saverio -->


<!-- Date: Fri Apr 20 14:10:46 2001 -->
<pre>Birds crate 11 PHA</pre>
<!-- Author: Sav -->


<!-- Date: Fri Apr 20 15:01:35 2001 -->
<pre>usual birds</pre>
<!-- Author: Sav -->


<!-- Date: Fri Apr 20 15:11:58 2001 -->
<pre>Birds  crate 11 PHA</pre>
<!-- Author: Sav -->


<!-- Date: Thu May 10 11:53:39 2001 -->
<pre>Replaced optical decoupler board in crate 11.</pre>
<!-- Author: Niccolo and Willis -->


<!-- Date: Wed May 30 05:44:13 2001 -->
<pre>Found crate 7 and 8 switched off since 29May,14.45. 
No Operator did it from the control program  
and no messages communicated to leave them off. 
Crate 7 and 8 switched back on. </pre>
<!-- Author: Luciana -->


<!-- Date: Thu Jun 21 20:46:15 2001 -->
<pre>CAEN Crate 4 was in an "off" state, so I turned it back on. 
I could not determine why from the log file.</pre>
<!-- Author: Willis -->


<!-- Date: Fri Jun 22 05:28:44 2001 -->
<pre>Crate 4 found auto switched off on 21st June at 20:21. 
Switched back on at 20:32. 
On Crate 4, no Operator actions have been recorded by monitor program, or anomalies in its working 
both before and after the problem. 
</pre>
<!-- Author: Luciana and Willis -->


<!-- Date: Tue Jul 3 07:58:01 2001 -->
<pre>&lt;br&gt;&lt;b&gt;HV alarm:&lt;/b&gt; 
&lt;br&gt;Alarms in the Plug HV system have not completely vanished. 
See the &lt;a href="/cgi/elog/elog.pl?nb=2001&action=copyentry&page=448&time=20:31:43"&gt;latest occurance for PEM CAEN  
crate 1.&lt;/a&gt;</pre>
<!-- Author: R.J. Tesarek -->


<!-- Date: Thu Sep 27 14:40:54 2001 -->
The following HV settings were changed for PES: 
<ul><li>West; PMT Box 2; Channels 8,10,12,14,16,18 
<ul><li>Previously at default (~850 V) 
<li>Currently at 725 V.</ul> 
<li>West; PMT Box 5; Channel 15 
<ul><li>Previously at insane 1033 V 
<li>Changed to 700 V (from YMon plots, it looks like this tube is toast anyway). 
<li>The input voltage (chan 24) was lowered from 1083 V to 950 V. 
<li>Unconnected channels in this box (0,2,4,20,21,22) were lowered to 850 V.</ul> 
<li>The following channels in the east plug, which were previously at default values (~850 V) were changed. The new HV settings are given. 
<ul><li>PMT Box 1; Chan 1; 602 V 
<li>PMT Box 1; Chan 3; 636 V 
<li>PMT Box 2; Chan 5; 681 V 
<li>PMT Box 3; Chan 1; 655 V 
<li>PMT Box 3; Chan 3; 628 V 
<li>PMT Box 6; Chan 5; 683 V 
<li>PMT Box 7; Chan 1; 590 V 
<li>PMT Box 7; Chan 3; 602 V 
<li>PMT Box 8; Chan 5; 698 V 
<li>PMT Box 9; Chan 1; 608 V 
<li>PMT Box 9; Chan 3; 584 V 
<li>PMT Box 12; Chan 5; 758 V</ul> 
</ul>
<!-- Author: Alon, Erik, Mike L. -->
<!-- Comment: Thu Sep 27 14;42;15 comment by...Alon, Erik, Mike L. -->
Also many channels had changes (entered by Luciana) for Martin's analysis of a PES source run.


<!-- Date: Fri Sep 28 17:27:58 2001 -->
<pre>-While going through the HV settings for the East Plug on 
9/27/01, Erik and I noticed that all odd PMT boxes were  
identical to each other and all even boxes were identical to 
each other. 
 
-Later I discovered that these were just copied from the West 
Plug.  This meant that these were meant to be temporary values 
but were never actually replaced. 
 
-So today I loaded new HVs for the East from old UCLA test 
stand data.</pre>
<!-- Author: Alon -->


<!-- Date: Sun Sep 30 00:16:00 2001 -->
<pre>There are 2 documents that list HVs from the test stand at UCLA. 
One is an email from Allen Hui to Mike Lindgren dated 7/19/1999. 
Unfortunately, this doesn't agree with the other document that 
lists all the PMTs by serial number and their gains.  Also the 
email only had information for the east plug. 
 
I loaded new HV settings from the latter document because it is 
the most complete even though some serial numbers were listed  
incorrectly.  For the missing tubes we got the gain by taking 
the manufacturers specs and subtracting 35.  This number was  
reached by roughly averaging the difference of the test stand 
data and the data from the specs. 
 
Now we should see improvements in the PES because the gains 
should be much more consistent.</pre>
<!-- Author: Alon, Erik -->


<!-- Date: Mon Oct 1 21:31:22 2001 -->
<pre>We loaded yet another set of HVs. The changes this time were all in the west plug. The new configuration file is called FCrate0112PesFineTune.txt or something similar. The vast majority of the 20 or so changes were for tubes where we have no test stand data or no serial number information at all. These tubes we have to basically tune by hand.</pre>
<!-- Author: Alon & Erik -->


<!-- Date: Tue Oct 2 17:26:16 2001 -->
<pre>Installed the new version of hv control/monitoring code. 
Main Mods: 
1)Dumped on logfile channels with hvmon/hvset greater than a 
  'warning' threshold of 0.015%. 
2)Possibility to Save on file the full parameters/status of 
  a group of channels.</pre>
<!-- Author: Luciana -->


<!-- Date: Wed Oct 3 20:22:15 2001 -->
<pre>Put in the UCLA test stand voltages for the PPR.  Now the HVs are around 550 instead of 850. 
Also changed the following PES voltages: 
PMT Box,PMT Channel 
1,9 
2,9 
2,11 
2,17 
4,18 
5,13 
11,15 
 
The voltages are in FCrate0112LoadPPR.txt on the HV Monitor computer.</pre>
<!-- Author: Alon -->


<!-- Date: Thu Oct 11 05:18:52 2001 -->
<pre>Crate 12 found unconnected yesterday. 
Since nobody wrote about necessity of working on it 
now I switch it on.</pre>
<!-- Author: Luciana -->


<!-- Date: Sun Oct 28 16:21:59 2001 -->
Calibration of the Plug HV CAEN channels  
On Thursday October 25 Antonio Bassi and myself started the re-calibration of the Caen HV on all the Caen system. We started from East plug since starting next week teh east side will no longer be available do to MiniPlug installation. 
Thursday oct 25 12.30 
We started calibrating crate # 8, an upper crate, since the lower side of the east plug was not accessible . They were firing laser to try to restore the ISL cooling system functionality.  
- Remove card S.N. 111 located in slot 9 of crate 8 to insert   
  voltmeter card. I was not able to do it. The card would not  
  fit in. Antonio tryed and finally he was able to insert the  
  calibration card in place. 
  Antonio tried to calibrate via high speed caenet, but he    
  got trouble so he had to resort to do the calibration via the  
  RS 232 directly on the crate. 
WARNING : always remove Caenet cable from the crate before starting calibration with RS232 ! 
- We moved to a lower crate. It took 3 hours to complete the    
  calibration of crate 8 .  
  Antonio used crate 12 to calibrate slot 9 of crate 8 so we    
  have to reconfigure both crate 8 and 12 before  
  we can check the results  
 
Friday oct 26 11.00 am 
-start calibration of crate 11 East side. Found a problem with   
 crate on and off. The crate will not start back on. Do not  
 understand why. We tryed a few reset and finally it did work. 
 Strange behaviour . 
 We took out card S.N. 45 from slot 9 of crate 11 in order to  
 insert calibration card.  
 When trying calibrating card S.N. 128 in slot 8 we found that  
 the pin of the block blue AMP connector is broken and is stuck  
 in the back of the card thus preneting us to insert the  
 calibration card connectors into the card to be calibrated.   
 We had to replace that card. 
- REPLACEMENT: card S.N. 128 in slot 8 of crate 11 was replaced  
  with S.N. 78 , a spare card sitting in the second floor test  
  setup. 
- start calibration of crate 9 upper crate. 
  We found that card S.N. 41 in slot 2 of crate 9 has some  
  channels that will not calibrate properly. We had to remove it  
  and replace it with a spare card. 
- REPLACEMENT : card S.N. 41 in slot 2 of crate 9 was replaced  
  with S.N. 18 , a spare card sitting in the second floor test  
  setup  
--- But when Antonio made a check he found that both card number  
    78 and 18 were out of calibration of about 1.2 volts !!! 
    But both cards were calibrated upstairs by Antonio a few  
    days ago in the second floor test setup. They look perfect  
    there. Could the site were the calibration was done make the  
    difference ? To test it we recalibrated both spares cards  
    directly in the pit by using crate 11. Accidentally  Antonio  
    stripped out a chip from the card S.N. 18 while inserting  
    the  card into the crate. We had to replace it with another   
    spare card from second floor 
-REPLACEMENT : card S.N.18 replaced by card S.N. 56 in slot 2 of  
    crate 9 
- Antonio put back the chip in place and brought card S.N. 18 to  
  second floor to test it. it looks ok . But we will test it   
  further before we declare it ok. 
We also have to investigate about why calibrating upstairs or dowstairs seems to give a 1.2 volts difference .
<!-- Author: stefano -->


<!-- Date: Fri Nov 16 15:20:52 2001 -->
<pre>We plugged a terminal into the rs232 port of crates 1, 6, 5, and 
4 on the west side to check the CAENET version. During the 
startup initializaion, we only saw "Testing CAENET", with no 
Mod./revision. </pre>
<!-- Author: Howard and Willis -->


<!-- Date: Mon Nov 26 07:09:41 2001 -->
<pre>On Saturday 25 about 2 p.m.  crates of the East Plug (7,8,9,10,11,12) 
autoreset many times. 
We tried to switch on the crates and swtitch on the channels, 
each crate was stable for a few minutes and then reset again. 
It was decided to keep swithched off the above crates and 
stop monitor for the whole night. 
 
At 5:30 a.m. , Nov. 26, we tried to recover the system: 
- switch on crates by using the remote on/off box, 
- switch on HV channels. 
Channel 19, Slot 2, Crate 7 was found in undervoltage status, 
permanently at 67/873 Volt; 
this channel is now Ignored by the Monitor. 
           Luciana e Paolo 
</pre>
<!-- Author: Paolo Mazzanti -->


<!-- Date: Mon Nov 26 08:30:13 2001 -->
<pre>Old Configuration files moved from Folder E:/Hv 
to folder E:Hv/HvOldRelease.</pre>
<!-- Author: Luciana -->


<!-- Date: Tue Nov 27 05:29:39 2001 -->
<pre>It happened that on iFix pages (CdfHvSummary.grf)  
were reported error on HV plugs. 
These errors were not seen on the same pages opened on  
the HV plug pc (cdfephv). 
The iFix responsible will be informed about this. 
 
 
 
 
</pre>
<!-- Author: Paolo  Mazzanti -->


<!-- Date: Fri Dec 7 04:25:21 2001 -->
<pre>At about 2:00 a.m. i was paged for an alarm in iFix pages: 
the heart beat was grey (no communication). 
However the other systems were in the same status. 
Ii seems (?) a network problem. 
The plug pc was stuck for a few minutes; 
then the normal situation restablished  
without any intervention. 
 
    
 
</pre>
<!-- Author: Paolo -->


<!-- Date: Tue Jan 15 11:12:37 2002 -->
<pre>When I arrived at Fermilab, two days ago, I found PC Udine, the second floor test bench PC, not working. I seeked Mark Knapp  help . He found that an internal connection to the hard disk was missing. I also found that the A303 interface card was removed. Luciana told me it was removed by Willis Sakumoto and Franco Semeria in december to make some test on third floor, and in fact I found it on the third floor. I put it back into the PC. Now it should be working ok. </pre>
<!-- Author: stefano Zucchelli -->


<!-- Date: Wed Jan 16 18:13:02 2002 -->
<pre>The access time was anticipated at 3 pm. I entered the pit at  
15.30 . At that time they were still removing the muon toroid 
walls on the east plug. At 4.00 pm I walked up to third floor to chek the monitoring situation and guess what : NO MORE PROBLEMS ! 
Exacly as in the december 14 2001 access there was no more test do to ! Willis was sitting with me while looking at the scope  
( I took some picture of what should it be when it is ok ). 
At 16.30 I went back in the pit and start inspecting the  
crates on the East side. Found that spare Caenet cable is  
located nearby Crate 8, not crate 2.  
So we could in principle devide the caenet chain into two independent chains if needed. All ok on the East Plug, moved to the west. 
At around 17.00 I inspected crate 2 and found a loose lemo  
connector. One of the kill connector was almost unplugged , why ? 
Could it be this the origin of the problem ??? To good to be true  
but let's' wait and see. 
By 18.00 I ended the inspection of the crates. From time to time 
I came up to third floor to check if the system was stable and 
apart for a crate 2 " noslave" alarm at around 17.20 I couldn't 
find a single problem. Card in crate 7 slot 4 is more and more 
drifting . Must be replaced asap. 
Discussing with Bob Roser I found out that there are many things 
they did before moving the muon walls. They left the power  
supply on the CDF on, but they put off the solenoid. Could the 
magnetic field be the problem or a temperature effect ? I agreed  
we shall watch closely the time at which several operations are 
performed while bringing back the detector. </pre>
<!-- Author: stefano zucchelli -->


<!-- Date: Thu Jan 17 15:34:57 2002 -->
I put the jumper connectors, instead of the resistive loads, on the back of two cards, serial number 14 and 81.  
Still S.N. 14 is in overcurrent and S.N. 81  is in undervoltage. 
the vmon on its 24th channel is 1.8 volts instead of the 1328 volts of the settings. What could be wrong with it ?  
I will try to calibrate both cards.  
<!-- Author: stefano zucchelli -->


<!-- Date: Thu Jan 17 15:53:54 2002 -->
Still no errors of the "no slave' type on the plug system. 
i sent to Caen people the oscilloscope plots with and without  
noise, i.e. before and during the access. 
<!-- Author: stefano zucchelli -->


<!-- Date: Thu Jan 17 16:01:38 2002 -->
I forgot to say that yesterday I also found a bundle of signal  
cable sticking out in front of the caen crate in the lower east crates on the south east side. The bundle of signal cable was strapped together with the RG58 caenet cable . I though it could be a problem since when the muon wall are closed the wall might squize the coax cable and make temporary shorts along the cable. So I routed the cable bundle in a safer way. 
May be this was the origin of the problem. In this way one could explain why the problem disappeared once there is an access. We will see in the next few days if the problem of ' noslave' reappears. Meanwhile we wait for hints from Caen
<!-- Author: stefano zucchelli -->


<!-- Date: Fri Jan 18 17:17:08 2002 -->
<pre>After consulting with Caen I was told to check the primary 
HV channel ( ch 24 ) fuse. This fuse tipically blows up when 
a card is inserted into the crate when the crate is on. 
In fact after opening the active channel of card serial number 
81 I found its fuse broken. I will check also card serial  
number 14 . But it is clear what the origin of the problem was. 
Never say NEVER plug or unplug a card with the crate on. 
I will try a repair S.N. 81 by taking the fuse from card 4  
that has a broken distributed channel, ch 19. 
Operazione riuscita ! Oops sorry : everything went OK . 
Now I will try to do the same with the second card , the S.N. 14 
but first I have to find replacement fuses. 
Then I will have to recalibrate both cards.  
 </pre>
<!-- Author: stefano zucchelli -->


<!-- Date: Sat Jan 19 18:49:05 2002 -->
I did try to reproduce the no communication problem on second floor crate. there was no way to induce the alarm by playing with the front panel lemo connectors, while the alarm was immediatelly reproduced when i sqeesed the cable in a vice, against the crate front handle. the effect is quite reproducible  
So this was the problem : the bundle of cable in front of crate 11 and not the false connection in crate 2 ! 
I noticed that card Serial Number 115 . currently located in  
slot 0 of second floor spare crate shows an unstable behavior of channel 10. This channel sometimes triggers an undervoltage alarm, a real one. 
Then after a while it get back to normal and holds the setting voltage.  
The card S.N. 115 is not a good spare ! 
<!-- Author: stefano zucchelli -->


<!-- Date: Sun Jan 20 18:02:52 2002 -->
try to measure ohmic resistance on caenet cable. 
With crate off is 49.1 Oh. With crate on is 69.6 
I measure the ohmic resistance of the caenet cable once the crate is on : it is 70.1 ( or 29.8 ) depending on which dvm lead I put on the cable ground . If the Com lead of the dvm is put on the cable ground the redout is 69.9. If I change the dvm leads I get 29.8 Why ? ask Caen .  
Try to measure the ohmic resistance once the crate is off and found 49.6 Ohm in both cases . 
Anyway I went on and tried to put the caent cable in a vice and squeeze it untill I  
got back the "no slave' alarm. Then measure resistance. 
Bye the way once again troubles with channel 10 : is  
undervoltage of 50 volts. I have to mask it out. 
WHAT ? monitor blue redout is at 105.6 % Why ??? 
When the "no slave" alarm appeared I measured the ohmic resistance on the Caent cable : is 0 Ohms , a short circuit ! 
When I relise the vice I found the communication start working 
once again. I measure the resistance in this situation : it is 
back to 69.1. 
That's it : for the next tie a good diagnosis tool will be to turn the crates off and easure the ohmic resistance on the Caenet  cable, as by the way was suggested by Lorenzo Fontana from CAEN.
<!-- Author: stefano zucchelli -->


<!-- Date: Mon Jan 21 17:47:41 2002 -->
Card serial number 14 has the fuse ok but it is still not 
working. Why ? Ask Caen. Thi afternoon I went in the pit, there was a control access, to inspect plugs. Unfortunatelly only West toroids were moved so I could not had access into the East side, the one were I found the misplaced cables bundle. 
on the West side there is planty of space between the SY527  
crates and the toroid wall. I took some picture with a digital camera so that we can design a proper crate cover, clear but strong enough to protect the system. I hope at the next access to be able to inspect also the East side.  
The system meanwhile is still very quite. 
<!-- Author: stefano zucchelli -->


<!-- Date: Tue Jan 22 09:36:23 2002 -->
<pre>Probelm with cards repair. Called Caen. Nothing to do : it may be that the primary channel is broken. We agreed that I should ship cards back to Caen. I will ship the following cards : 
- S.N. 14 fuse on primary channel is ok but card still not   
  working 
- S.N. 81 fuse repaired two days ago . It looks like it was ok 
   but now is not working once again . Why ??? 
- S.N. 4 from crate 7 slot 2 had channle 19 broken 
- S.N. 115 has channel 10 flickery , sometimes is ok sometimes  
   is undervoltage of about 50 volts</pre>
<!-- Author: stefano zucchelli -->


<!-- Date: Wed Jan 23 18:20:27 2002 -->
Six A932 cards arrived today at CDF. The serail number are  
S.N. 41, S.N. 101 (repaired)  
S.N. 139, 140, 141, 142 brand new cards 
The six spare cards are located inside the Bologna cabinet in  
the B0 second floor. 
So the total of spares available at fermilab right now is six . 
I am shipping back to italy the other four cards for repair.
<!-- Author: stefano zuchelli -->


<!-- Date: Wed Feb 13 18:10:31 2002 -->
<pre>Made the following HV Changes in the Plug ShowerMax: 
 
Plug	Box	PMT #	Old HV	New HV 
West	3	10	718	785 
West	11	6	838	756 
East	4	14	705	738 
East	7	8	680	729 
East	11	2	567	646 
East	12	13	693	736 
 
Reverted to the HV settings before Oct. shutdown because they 
seemed much better than the current ones.</pre>
<!-- Author: Alon Attal -->


<!-- Date: Tue Jun 18 20:18:57 2002 -->
<pre>New PES HV settings following June shutdwon. 
 
Plug	Box	PMT #	Old HV	New HV 
West	6	5	864	725 
West	6	14	957	725 
West	9	17	975	775 
West	12	5	750	725 
 
The first 3 were replaced and the last was just set too high.</pre>
<!-- Author: Alon -->


<!-- Date: Thu Aug 29 12:16:58 2002 -->
<pre>29 Aug 2002 00:12:57 --&gt; 
  Plug CAEN HV crate 8 (wedges 3-6) failed about 1400hrs/28Aug20:  
  "fan failure" hardware error. This crate has been replaced at  
  the end of this access (by Dervin and Lou), and the replacement  
  is now operational.</pre>
<!-- Author: Howard, Mike L, Willis -->


<!-- Date: Sun Sep 15 14:14:17 2002 -->
Renamed hvV1.exe and hvpanel.uir in E:\HV to hvV1Old.exe and hvpanelOld.uir. Copied E:\HV\HVNewRelease\hvV1.exe and hvpanel.uir to E:\HV. This new version re-queries the CAEN more times after a voltage/current readout spike. New features: 
full voltage/standby indicators and toggle switches on monitor panel. (The toggle switches do not yet function).
<!-- Author: Willis -->


<!-- Date: Thu Dec 5 09:52:37 2002 -->
<pre> 
The last Release of the Plug HV Control and Monitoring Program  
is running Under Test. 
This version contains the Read Out of the iFix Control Variable, 
also during the Sleeping period (60 secs long). 
This makes the iFix operations of ON/OFF/stby faster than before.  
This release has been started from E:/HV/Release28Nov2002, 
in case of problems: 
- stop the running client 
- from the E:/HV, start the 'old' client (hv.exe). 
</pre>
<!-- Author: Luciana  and Paolo -->


<!-- Date: Mon Dec 30 03:14:45 2002 -->
<pre>Crate 8, Slot 9 Channel 17 does not hold the standby voltage 
V1 = 595 Volt. It goes to Vmon = 658 ,6 Volt. So it gave an overvoltage alarm. 
I set V1 = 658 Volt as standby voltage and the alarm disappeared. 
The full voltage HV= 992 Volt does not give any problem. 
 
Luciana </pre>
<!-- Author: Luciana -->


<!-- Date: Sun Jan 12 22:48:59 2003 -->
Plug HV turned off and hv.exe/hVserver.exe terminated for the 
13Jan03/0700 power outage. The 12 CAEN crates have been also 
been powered off via the remote control panel by the plug pc 
monitor.
<!-- Author: Willis -->
<!-- Comment: Fri Jan 17 14;46;06 comment by...Willis -->
Plug CAEN crate 10 died after the power was restored: the crate
fails to turn on properly - the  "Check Passed" LED does not turn on and no other error LEDs went on. This crate was replaced
on 16Jan03 and the the crate was taken to PREP on 17Jan03 by
Devin's group. CAEN crate 12 also failed to turn on properly
after the GAS ALARM power trip on 14Jan03; it failed to come
up for about a day and then the next day, it came back on its
own.
<!-- Date: Fri Jan 17 14:39:15 2003 -->
Plug HV status on 17 Jan 2003: 1) the hardware trip configuration of plug CAEN crate 10 changed to be the same as the other 11 crates; 2) crate 
10 slot 7 channel 15's overvoltage readback problem [16Jan03 - was reading back at ~2700 volts when the channel was off] went away on its own. The plug HV hardware and controls are now operational and the plug HV has been put on STANDBY. 
The pin diodes took about 40 minutes to go up to their nominal 
voltage from 0 volts.
<!-- Author: Howard and Willis -->



<!-- Date: Wed Jan 29 02:12:46 2003 -->
<pre>CAEN crate 06 was replaced, first around 1700 hrs, 28Jan03. 
The fan failure LED was on and it was beeping an alarm. 
The replacement crate used was "crate 10", which was taken 
to PREP two weeks ago, and returned because no problem was 
found. The original problem was that the crate would not 
go to the ready state (check passed "ON") after power up. 
This also occured, but when this crate was fully loaded 
with 10 HV modules, as it was when it was "crate 10". 
This CAEN crate may have problems with power loading. &lt;br&gt; 
The second replacement CAEN crate is the brand new one; 
but we first had to replace its input AC power connector 
with the "fan failure" crate 6 one. &lt;br&gt; 
Next, the HV modules in slots 3 and 4 did not work properly. 
While the supply channel 24 was fine, several channels  
had low VMon values -- most around 20% of nominal and some 
at a very low 1 to 5 volts. We replaced these with spare 
HV modules, but one of replacements failed: all channels 
at 1-2 volts, with the supply also at 2 volts and at  
a current of 13 mA (overcurrent state). &lt;br&gt; 
 
Things are now fully operational (0130 hrs, 29 Jan 2003).</pre>
<!-- Author: Willis, Steve Hahn, Rob Roser, Mike Lindgren -->


<!-- Date: Mon Feb 3 15:36:21 2003 -->
Plug CAEN crate 10 slot 7 channel 15: once again the readback 
was stuck at 2700v (supply voltage is ~960v). This readback 
value remained when the channel was turned on and even when it 
was turned off. Resetting the crate did not clear this; a 5 minute power cycling CAEN crate 10 did not work; however a 
keeping the crate off for 20-30 minutes and then turning it 
back on fixed the problem. 
<!-- Author: Willis -->


<!-- Date: Tue Feb 25 20:31:41 2003 -->
PHA West Wedge 11 / Plug CAEN crate 4 slot 0 HV repairs:<br> 
<ul> 
<li>Sometime during the 25Feb03 access, this plug 
    CAEN HV card went into a KILL state (interlocked off). 
    Replacing the card did not fix the problem, but replacing 
    the HV cable bundle did -- meaning the safety interlock cable 
    in the bundle was broken 
<li>Rob Roser found the cable break in the region where the 
    HV cables from plug CAEN crates are routed from the back 
    of the plug electronics rack to the front, by the swivel 
    bolt mount on the rail (the one that locks the plug onto 
    the rest of the detector) 
<li>Mike Lindgren spliced the cable with crimp connectors. 
    This fixed cleared up the KILL/interlock problem. The 
    plug HV goes to full voltage without any problems. 
<li>Steve Hahn taped up the cable bundles by the swivel bolt 
    mount to prevent an accident like this one in the future. 
    There apparently have been similar plug HV cable tears in 
    this region in the past -- Steve and I saw ~3 plug HV cables 
    with splices. 
</ul>
<!-- Author: Willis and Steve Hahn -->


<!-- Date: Fri Sep 12 15:12:19 2003 -->
<b>MONTH/YEAR Marker: 12 September 2003</b>
<!-- Author: Willis -->


<!-- Date: Fri Sep 12 15:14:41 2003 -->
The new Dell plug HV monitor/control PC has been installed. 
For additional details, see the  
<a href= 
'/cgi/elog/elog.pl?nb=2003&action=view&page=764&frame=2&anchor=14:44:15.547'> 
CDF elog entry</a>
<!-- Author: Willis -->


<!-- Date: Tue Oct 14 13:14:48 2003 -->
Plug HV crate work  
<ul><li>CAEN crate 12 failed at or before the 13Oct03 power outage due to the usual fan failure problem. We replaced the crate with 
what appears to be one repaired by CAEN 
<li>We were not able to download any group HV configuration parameters into the crate via hv.exe because of errors.The new 
crate behaves normally in all other aspects - the crate status 
is fine and there were problems reported during the HV module parameter diagnostic check as we did not change any of the HV modules. 
</ul>
<!-- Author: Howard and Willis -->


<!-- Date: Sat Jan 17 19:33:24 2004 -->
17 Jan 2004: HV module in Crate 7 slot 9 replaced. Channel 3 
had voltage readings of several hundred volts above nominal.
<!-- Author: Willis -->