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Entry  Fri Dec 8 23:31:31 2017, johannes, Frogs, ASS, c1ass slow channel offloading scripts with small  
    Reply  Wed Dec 13 09:49:23 2017, johannes, Update, ASS, wiring diagram 1Y9.pdf
       Reply  Thu Dec 14 00:32:56 2017, johannes, Update, ASS, Acromag new crate; c1auxex2 configured as gateway server for acromag fp_mod_4U.pdfIMG_20171213_171541850_HDR.jpg
          Reply  Thu Dec 14 23:27:46 2017, johannes, Update, DAQ, aux chassis design auxdaq_40m_4U_front.pdfauxdaq_40m_4U_rear.pdfauxdaq_40m_4U_DSub37x2.pdfauxdaq_40m_4U_IDC50.pdf
             Reply  Tue Jan 9 00:07:03 2018, johannes, Update, DAQ, etmx slow daq chassis 
                Reply  Wed Jan 10 22:24:28 2018, johannes, Update, DAQ, etmx slow daq chassis 
                   Reply  Thu Jan 11 09:57:17 2018, Steve, Update, DAQ, acromag at ETMX Acromg_in_action.png
                   Reply  Thu Jan 11 20:59:41 2018, gautam, Update, DAQ, etmx slow daq chassis 
                      Reply  Wed Jan 17 14:32:51 2018, gautam, Update, DAQ, Acromag checks OSEMPDmon_Acro.png
                         Reply  Wed Jan 17 22:44:14 2018, johannes, Update, DAQ, Acromag checks 
                            Reply  Sun Jan 21 13:11:25 2018, johannes, Update, DAQ, Acromag checks 
                   Reply  Fri Jan 12 10:02:05 2018, johannes, Update, DAQ, etmx slow daq chassis 
                      Reply  Fri Jan 12 19:15:34 2018, johannes, Update, DAQ, etmx slow daq chassis 
                         Reply  Wed Jan 24 18:12:31 2018, johannes, Update, DAQ, ETMX auxiliary DAQ work IMG_20180124_120202019.jpgIMG_20180124_120123064.jpgIMG_20180124_120219278.jpgIMG_20180124_120059765.jpg
                            Reply  Wed Jan 24 19:17:06 2018, johannes, Update, DAQ, c1auxex2 startup behavior 
                               Reply  Wed Jan 24 23:13:30 2018, johannes, Update, DAQ, c1auxex2 startup behavior 
    Reply  Thu Dec 14 19:33:20 2017, gautam, Frogs, ASS, c1ass slow channel offloading scripts with small  
Message ID: 13565     Entry time: Sun Jan 21 13:11:25 2018     In reply to: 13554
Author: johannes 
Type: Update 
Category: DAQ 
Subject: Acromag checks 

After some research: -the- reason for the reduced +/- 20,000 swing in raw values is a default setting for having support for legacy devices enabled when using the acromag proprietary i2o peer-to-peer protocol. So this is doubly unnecessary because a) we don't have any legacy devices at all and b) we're using pure modbus/TCP and no i2o. To change the setting I have to connect via the USB configuration utility. In addition, I want to understand the averaging feature of the acromag units better, which is also configured via USB, and lets one set a fixed amount of samples to be averaged before updating the read-register value. The documentation says that the 8 channels are multiplexed into a single ADC, and that new input data is available after 10 ms for each channel, suggesting a sampling rate of 100 Hz per channel and that the multiplexing happens faster, but is not super-clear about this, so I want to test it in the cryo lab first before unleashing it onto c1auxex2.

Furthermore, the standard timing options for updating epics records are 10s, 5s, 2s, 1s, 0.5s, 0,2s, and 0.1s. On the previous c1auxex, the monitoring channels were set to 0.1s, but that clashes with the 16 Hz global EPICS rate, resulting in partial double-sampling. One can manually provide the option 0.0625s for 16Hz update rate. I will test this and how it deals with the averaging in the cryolab too.

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