[Dsg-ft] HV cable pin modification

Fri Jul 21 19:20:03 EDT 2017

Dear All,
I just wanted to say that, thanks to Amanda's and Tyler's modification 
of the FTCal HV cable, we were able to turn the detector on and check it 
out; all channels are operational as in the EEL building.
When the HV cable was made, the use of HW interlocks was not considered 
and for this reason these additional pins were not mounted on the connector.
Thanks again for your help in this.
Best regards,
     Raffaella

Amanda Hoebel wrote:
> Hi Amrit,
>
> Below are the answers to your questions.
>
> 1. what was wrong with the version of jumpers we had used in the eel?
>
> The jumpers we used for interlock testing were used because we did not have the cable hooked up (see pic 1). The cable was supposed to have pins in 79 and 80 pin-outs so when it was hooked up to the HV card, the interlocks would work. The cable did not have these pins and the interlocks did not work.
>
> 2. was some thing wrong with the front panel jumper or with the jumper on board?
>
> Nothing on the board was wrong. The cable did not have pins in the 79 and 80 pin-out positions to enable interlocks. See pic 2.
>
> 3. why did it not work in the hall?
>
> This is the first time the cable is being used for the interlocks. The cable did not have the correct pins. The interlocks will not work without those pins.
>
> 4. was the jumper on the front panel and board removed?
>
> The jumper on the front panel was removed because it cannot be there if the cable is to be connected. The front panel jumper was put inside the cable connector to serve as pins 79 and 80. Nothing in the board was touched.
>
> 5. if so by whom?
>
> Tyler and I put the pins that Mindy made in the cable.
>
> 6. Why wasn't it necessary for this "The calorimeter HV cables have been modified to include pins in the 79 and 80 pin-outs" to be done in the tests conducted in the eel?
>
> We chose not to test the interlocks with their cable attached so as not to damage the detector in case the HV was still connected on the detector side. The jumper to pins 79 and 80 were meant to replace the cable temporarily.
>
> 7. who modified the the HV cables?
>
> Tyler and I modified the HV cable, with Mindy's jumper.
>
> 8. how many cables were modified?
>
> There are three calorimeter HV cables. All three were modified.
>
> 9. do all three modules work?
>
> Yes, all three work.
>
> 10. what does "these pins enable interlock connection mean?"
>
> Without those pins connected into the front panel of the card, the interlocks are not enabled. They need to be shorted to each other via the front panel jumper.
>
> 11. does it mean the interlock works?
>
> Yes the interlocks work now.
>
>
> Regards,
> Amanda
>
> ----- Original Message -----
> From: "Amrit Yegneswaran" <yeg at jlab.org>
> To: "dsg-ft" <dsg-ft at jlab.org>
> Cc: "Patrizia Rossi" <rossi at jlab.org>
> Sent: Friday, July 21, 2017 4:26:15 PM
> Subject: Re: [Dsg-ft] HV cable pin modification
>
> hi amanda,
> could you please elaborate.
> i can get a whole lot more info from aramaic.
> Bilingual Greek and Aramaic inscription by the Mauryan emperor Ashoka the Great at Kandahar , Afghanistan , 3rd century BC.
>
> at least start off by answering these questions and add more info as needed.
>
>
>
>      1. what was wrong with the version of jumpers we had used in the eel?
>      2. was some thing wrong with the front panel jumper or with the jumper on board?
>      3. why did it not work in the hall?
>      4. was the jumper on the front panel and board removed?
>      5. if so by whom?
>      6. Why wasn't it necessary for this "The calorimeter HV cables have been modified to include pins in the 79 and 80 pin-outs" to be done in the tests conducted in the eel?
>      7. who modified the the HV cables?
>      8. how many cables were modified?
>      9. do all three modules work?
>      10. what does "these pins enable interlock connection mean?"
>      11. does it mean the interlock works?
>
> i'm no saint, but this e-mail is indeed testing the patience of a saint"
>
> i hope you do better with information dissemination in future.
> signing off with Matthew 7:6 KJV
>
>
> From: "Amanda Hoebel" <amandah at jlab.org>
> To: dsg-ft at jlab.org
> Sent: Friday, July 21, 2017 3:38:05 PM
> Subject: [Dsg-ft] HV cable pin modification
>
> Hi,
>
> The calorimeter HV cables have been modified to include pins in the 79 and 80 pin-outs. These pin locations enable interlock connection.
>
> Regards,
> Amanda
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