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Entry  Fri Mar 19 19:15:13 2021, Jon, Update, CDS, c1auxey assembly 
    Reply  Thu Mar 25 12:11:53 2021, Yehonathan, Update, CDS, c1auxey assembly 20210325_115500_HDR.jpg20210325_123033.jpg
       Reply  Thu Mar 25 14:16:33 2021, gautam, Update, CDS, c1auxey assembly 
       Reply  Tue Mar 30 17:27:04 2021, Yehonathan, Update, CDS, c1auxey assembly 
          Reply  Wed Aug 25 11:48:48 2021, Yehonathan, Update, CDS, c1auxey assembly 
             Reply  Mon Sep 13 14:32:25 2021, Yehonathan, Update, CDS, c1auxey assembly ETMX_OSEMS_Noise.png
                Reply  Wed Sep 15 11:27:50 2021, Yehonathan, Update, CDS, c1auxey assembly c1auxex_Grounding_OSEM_comparison1.pdfc1auxex_Grounding_OSEM_comparison2.pdf
       Reply  Thu Apr 15 17:24:08 2021, Jon, Update, CDS, Updated c1auxey wiring plan C1AUXEY_Chassis_Feedthroughs_-_By_Connector.pdf
          Reply  Mon Apr 19 21:54:55 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
             Reply  Wed Apr 28 18:56:57 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                Reply  Thu Apr 29 16:35:51 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                   Reply  Thu Apr 29 19:55:45 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                      Reply  Fri Apr 30 19:18:51 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                         Reply  Mon May 3 20:36:46 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                            Reply  Sun May 23 18:28:54 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                               Reply  Fri May 28 10:54:59 2021, Jon, Update, CDS, Opto-isolator for c1auxey optoisolator.jpeg
                                  Reply  Thu Jun 3 17:15:17 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_Isolator_NPN_Input.pngOptical_Isolator_NPN_Output.png
                                     Reply  Thu Jun 3 22:08:00 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                        Reply  Fri Jun 4 14:49:23 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                           Reply  Fri Jun 4 17:46:25 2021, unYehonathan, Update, CDS, Opto-isolator for c1auxey 20210604_173420.jpg
                                              Reply  Sun Jun 6 16:33:47 2021, Jon, Update, CDS, BI channels on c1auxey 
                                                 Reply  Mon Jun 7 13:14:20 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                                    Reply  Tue Jun 8 11:54:39 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                           Reply  Sun Jun 6 03:02:14 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 12:15:16 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 15:59:51 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                 Reply  Mon Jun 14 15:31:30 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                    Reply  Tue Jun 15 21:48:55 2021, Koji, Update, CDS, Opto-isolator for c1auxey Acromag_RTS_BI_config.jpg
                                                       Reply  Wed Jun 16 17:24:29 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                          Reply  Wed Jun 16 20:32:39 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                             Reply  Fri Jul 9 18:35:32 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                Reply  Mon Jul 12 18:06:25 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                   Reply  Wed Jul 28 12:47:52 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_NoRef.pngSUS-ETMY_SparePDMon0_Ref_WithGND.pngDifferentialOutputTest.png
                                                                      Reply  Wed Aug 11 12:06:40 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_2.png
Message ID: 16276     Entry time: Wed Aug 11 12:06:40 2021     In reply to: 16263
Author: Yehonathan 
Type: Update 
Category: CDS 
Subject: Opto-isolator for c1auxey 

I redid the differential input experiment using the DS360 function generator we recently got. I generated a low frequency (0.1Hz) sine wave signal with an amplitude 0.5V and connected the + and - output to a differential input on the new c1auxcey Acromag chassis. I recorded a time series of the corresponding EPICS channel with and without the common on the DS360 connected to the Ref connector on the Acromag unit. The common connector on the DS360 is not normally grounded (there is a few tens of kohms between the ground and common connectors). The attachment shows that, indeed, the analog input readout is extremely noisy with the Ref being disconnected. The point where the Ref was connected to common is marked in the picture.

Conclusion: Ref connector on the analog input Acromag units must be connected to some stable voltage source for normal operation.

Attachment 1: SUS-ETMY_SparePDMon0_2.png  50 kB  Uploaded Wed Aug 11 13:06:45 2021  | Hide | Hide all
SUS-ETMY_SparePDMon0_2.png
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