Difference between revisions of "HV HowTo for Users"
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A number of things can go wrong. If these solutions don't work for you, call an expert. | A number of things can go wrong. If these solutions don't work for you, call an expert. | ||
| − | 1. HV | + | 1. HV is slow ! Sorry, as I write this (Jan 2014), it's a problem. See point 4, too. |
| − | 2. The GUI | + | 2. HV crate is on ? There are two power supplies which must be turned on. |
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| + | 3. The Java GUI cannnot connect to the server. Note, the server runs on a PC and talks to the HV crate via a serial connection. If the server isn't working for some reason, rebooting the PC may help. The name of the PC is discovered in the tab corresponding to that crate; e.g. intelha3 on Left HRS. | ||
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| + | 4. Suppose the GUI appears to connect but the pages are incomplete or partially blank or there is a Java exception. I've noticed this when the delay parameters in the server are too small. Not sure what is happening, but I think that in this case the data are sometimes corrupted or incomplete, and the Java GUI cannot handle it. This is related to the problem mentioned in #1. See also 5. | ||
| + | |||
| + | 5. Another reason for #4 is that a card may be bad. The solution is to run low-level diagnostics, find the card that does not talk, and replace it. | ||
Revision as of 23:20, 8 January 2014
High Voltage Instructions -- the basics
The High Voltage is controlled by LeCroy 1458 crates and associated modules like the 1461N. A trailing "N" means negative, and a "P" means positive HV.
Simplified Instructions : To control the HV in Hall A, do the following
Login as "adev" on the "adaql1" or "adaql2" computers.
cd ~adev/slowc
To run the Left HRS alone: ./hvs LEFT
To run the Right HRS alone: ./hvs RIGHT
To run the beamline crate: ./hvs BEAMLINE
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I haven't gotten around to adaping this yet, but here are some old but useful instructions
http://hallaweb.jlab.org/equipment/daq/HVhelp.html
http://hallaweb.jlab.org/equipment/daq/gen_slow_control.html
=========================================
Troubleshooting
A number of things can go wrong. If these solutions don't work for you, call an expert.
1. HV is slow ! Sorry, as I write this (Jan 2014), it's a problem. See point 4, too.
2. HV crate is on ? There are two power supplies which must be turned on.
3. The Java GUI cannnot connect to the server. Note, the server runs on a PC and talks to the HV crate via a serial connection. If the server isn't working for some reason, rebooting the PC may help. The name of the PC is discovered in the tab corresponding to that crate; e.g. intelha3 on Left HRS.
4. Suppose the GUI appears to connect but the pages are incomplete or partially blank or there is a Java exception. I've noticed this when the delay parameters in the server are too small. Not sure what is happening, but I think that in this case the data are sometimes corrupted or incomplete, and the Java GUI cannot handle it. This is related to the problem mentioned in #1. See also 5.
5. Another reason for #4 is that a card may be bad. The solution is to run low-level diagnostics, find the card that does not talk, and replace it.
