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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: 13576     Entry time: Wed Jan 24 18:12:31 2018     In reply to: 13543     Reply to this: 13578
Author: johannes 
Type: Update 
Category: DAQ 
Subject: ETMX auxiliary DAQ work 

I replaced the two remaining D-Sub M/M cables that still had gender-changers with M/F cables today, completing the mechanical and wiring work on the ETMX rack. All backplane adapter boards were secured to a cross-strut of the crate using zip ties. This was necessary because the adapter boards don't fit the crate with their panels attached ( the ETMX eurocrate is the only one with slightly different dimensions from all the others), and the we can't mount them to the strut using the panels. This won't be an issue on any of the other crates.

   

   

In other news:

I disabled the legacy support in the three Acromag ADC units and set the input averaging to 10 samples via the USB configuration utility. The documentation is unfortunately a little sparse about what this actually means. The manual states that "fresh input data is available to the network every 10ms", so the sampling rate is for sure faster than 100Hz. Since the IOC updates its channels every .1 seconds I assume that an averaging value of 10 to reduce the input noise is safe. The maximum value the configuration tool permits is 200. I tried this using the CryoLab DAQ and set all input channels to 200 and used StripTool to look at the time series of a slow oscillation (.1Hz) with a large amplitude (16Vpp) and looked for missed data points, indicating too long wait times for channels updates. There was no such qualitative difference between 1 sample, 10 samples, and 200 samples, so even pushing the averaging value to max seemed okay. I went with the conservative value of 10 for the ETMX DAQ, but we can likely increase this if noise on the slow inputs becomes an issue.

The input scaling of the ADC channels has been corrected. I changed the conversion method in the EPICS records from manual using the ASLO and AOFF fields to using engineering units via EGUF and EGUL. This required a little attention. The Acromags scale the dynamic input range of +/- 10V to +/- 30,000 raw value, but the EPICS IOC interprets the data type as ranging from -32767 to +32768, so the EGUF and EGUL fields must be set to -10.923 and +10.923 to achieve proper scaling. I also changed the SCAN field on all ADC channels to 0.1 seconds. This has been done for all ADC and DAC channel records.

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