[Dsg-hallc_controls] CAEN-HV boards test results
Pablo Campero Rojas
campero at jlab.org
Thu Jul 25 13:49:41 EDT 2019
We developed an EPICS based program and CSS screens to test the three CAEN-HV boards that brought to the DSG-lab last week.
>From the test performed, we found that all three boards have CAEN software issues and one of them has a hardware issue as well.
1. Some channels’ parameters like “Imon”, “Vset”, VRdwn”, “Imax”, “Vmon” arbitrarily change from its pre-set values (set values at test time) to random values.
2. Discrepancies between GECO-2020 (CAEN Control software) and the PVs values (Generated by CAEN EPICS Server) displayed for some of the above mentioned variables.
However, we were able to ramp all channels to the set voltage after we solved these CAEN software issues by re-entering set values, re-setting power On/Off channels, and sometimes resetting the built-in CAEN EPICS Server.
1. Channel 22 of HV board (S/N: 556) does not to ramp up.
We recommend sending HV board S/N: 556 back to CAEN.
Attached below is a table with the summary of the findings for each board tested. To see detailed results from the test, you are most than welcome to come and visit us in the DSG room EEL-121.
For some channels, Vset stuck at a different value than the pre-set value during the test. One of the channels tripped, because "Imax" value changed from its set value during test.
Discrepancies between GECO-2020 values and EPICS PVs values for Imon.
All affected channels ramped to desired set value after the set values were re-entered and power On/Off reset.
For the recovery of some channels, reset of the built-in CAEN EPICS Server was required.
For some channels, Vset value changed from its pre-set value.
For variable Vmon, found discrepancies between GECO-2020 values and EPICS PVs values.
All affected channels ramped to desired set value after the set values were re-entered and channels were reset.
Set values for Vset, VRdwn and Vmax changed (PVs and value in GECO-2020) from its pre-set values during the test.
Re-entering values for Vset, VRdwn and Vmax, then reset power On/Off allowed ramp up all channels to the desired set voltage except for channel 22, which did not ramp up.
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