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

Hey Zhenyu,

 

Apologies for the delay.

 

I did some testing on FST-TEST-07 - I did indeed miss a solder bridge on the heel fillet of the Nicomatic connector, shorting OUT6P and OUT6N. I removed the excess solder. This was a joint that I had made, not the vendor. This goes to "APV3" on the Outer hybrid. Does this correspond to the "APV Chip #7" you mention below?

 

FST-TEST-XX - I checked more thoroughly and I don't see any solder bridges. I paid special attention, and measured continuity and termination of OUT5P and OUT5N - which corresponds to this "APV Chip 6" if I'm understanding right. It doesn’t have any measurements that stick out – I can see the termination on both wires of the pair, I have continuity through the cable as well.

 

FST-TEST-XX was the first cable we made by the vendor if memory serves. I don’t recall having them make any changes – All of the boards were assembled at once. KC Electronics assembled the purple cable to one board (FST-TEST-XX no label) and gave it to us for inspection, before doing the remainder of the batch. Outer 2 APV does have the pin placement correct (i.e. there aren’t swapped pairs), but I’ll have to double check tomorrow time permitting, to make sure they didn’t cross-pair or invert pairs of any of these signals on the first board. It would be a very easy mistake to make, as this purple cable we ordered unfortunately has almost a 6-8” lay.

 

Thanks,

 

Mike

 

 

From: Xu Sun <sunxuhit AT gmail.com>
Sent: Tuesday, September 1, 2020 11:53 AM
To: Ye, Zhenyu <yezhenyu AT uic.edu>
Cc: Capotosto, Michael <capotosto AT bnl.gov>; Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Inner Signal cables - FST-TEST-07 and FST-TEST-XX

 

Hi Mike,

 

To follow up Zhenyu's email, please find a summary slide for the cable check in the attachment.

 

Hope this helps.

 

Best,

 

Xu

 

On Tue, Sep 1, 2020 at 10:26 AM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Hi Mike,

I just dropped off two cables, FST-TEST-07 and FST-TEST-XX, to you (Building 510 address) at FedEx. They are expected to be delivered this Thursday (tracking number 396389239275).

We had some issues with these two cables:
1. FST-TEST-07: a chip (if we count chip 1-8, I think it was chip #7) is missing from the readout. This problem is reproducible
2. FST-TEST-XX: when I first used it, a chip (chip #6) was missing from the readout. Next time (a couple of weeks later) when I used it, chip 6 is in the readout but the pedestals of the chip showed abnormal behavior.
Xu will send some plots showing the problems later, which should confirm which chip it was.

I think we need to find out the cause of these problems and also implement a QC procedure for the inner signal cable assembly for production.

Best,
Zhenyu

https://urldefense.com/v3/__https://www.fedex.com/apps/fedextrack/?action="track&tracknumbers=396389239275&language=en&opco=FDEG&clientype=ivother__;!!P4SdNyxKAPE!W_r3sToFmcMzO4e2ayNJ89R8qVYTJDGfCWY9pG5uZ--jxVTWxBfDgIFqXN1tvRutyusoInI$
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