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["Capotosto, Michael" <capotosto AT bnl.gov>]

Zhenyu and All,

 

Not sure who to address this to - I've asked the vendor to hold off on putting the test stand cables on the T-board, as I've noticed some discrepancies.

 

The attached Excel spreadsheet from Steve Valentino was used when ordering the test stand cables. Each wire/pair is labeled using the "Via Ref Des" column, in column "G", which corresponds to the D-Sub connector pin listed in column A.

 

When compared to the schematic for T-Board V2.0 the Via Ref Des is incorrect - the correct values according to the schematic are listed in Column I. This affected only OUT0 through OUT3. They are in reverse order, and some also have polarity reversed. This affects the first V2.0 test T-Boards we assembled.

 

Zhenyu, I believe these were sent to you, if so just be aware.  

 

When compared to the T-Board V2.1 the Via Ref Des is incorrect - the correct values according to the schematic are listed in Column J. This affected only OUT0 through OUT2. OUT3 is correctly labeled. OUT0 through OUT2 all have polarity reversed.

 

I do not know the reason for the Via Ref Des changes between schematic/pcb revisions, or why the spreadsheet appears incorrect for both V2.0 and V2.1.

 

I would appreciate it if someone could tell me if my assumption regarding the correct labeling for the cable should be what I’ve listed in Column J, and if not let me know what it should be.

 

 

Thank you,

 

Mike Capotosto

 

Attachment: FST_Inner_cable_Test_Stand_Version_5MAr19_EDIT_10-17-2019.pdf
Description: FST_Inner_cable_Test_Stand_Version_5MAr19_EDIT_10-17-2019.pdf

Attachment: FST_Inner_cable_Test_Stand_Version_5MAr19_EDIT_10-17-2019.xlsx
Description: FST_Inner_cable_Test_Stand_Version_5MAr19_EDIT_10-17-2019.xlsx

Attachment: T-Board_v2_1.pdf
Description: T-Board_v2_1.pdf

Attachment: T-Board_v2_sch.pdf
Description: T-Board_v2_sch.pdf