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  838   Thu Oct 14 15:25:07 2021 Stefan Rittlivetime (or deadtime) of DRS4 evaluation board

The one thing you can do easily is to look at the scaler values. If one channel counts all physical events, and you have all read out events, then the ratio give you the live/deadtime. The hardware scalers also keep running during the DRS readout.

Stefan

Keita Mizukoshi wrote:

Dear experts,

 

I would like to use the DRS4 evaluation board for actual physics experiment.

I made a CUI script based on the drs_exam, https://github.com/mzks/drs4_tools/blob/main/build/source/drscmd.cpp.

In this framework, how can we obtain DAQ livetime (or deadtime)?

Has some function already provided to evaluate them from firmware?

 

Best regards,

Keita

 

  839   Thu Oct 14 18:03:52 2021 Keita Mizukoshilivetime (or deadtime) of DRS4 evaluation board

Thank you very much for your response.
Excuse me for my very stupid confirmation.
If I take N events finally and the hardware scaler value is M, the livetime is realtime*(N/M). Is this correct?

Stefan Ritt wrote:

The one thing you can do easily is to look at the scaler values. If one channel counts all physical events, and you have all read out events, then the ratio give you the live/deadtime. The hardware scalers also keep running during the DRS readout.

Stefan

Keita Mizukoshi wrote:

Dear experts,

 

I would like to use the DRS4 evaluation board for actual physics experiment.

I made a CUI script based on the drs_exam, https://github.com/mzks/drs4_tools/blob/main/build/source/drscmd.cpp.

In this framework, how can we obtain DAQ livetime (or deadtime)?

Has some function already provided to evaluate them from firmware?

 

Best regards,

Keita

 

 

  840   Thu Oct 14 18:42:31 2021 Stefan Rittlivetime (or deadtime) of DRS4 evaluation board

I would say not exactly, but it's a good approximation.

Keita Mizukoshi wrote:

Thank you very much for your response.
Excuse me for my very stupid confirmation.
If I take N events finally and the hardware scaler value is M, the livetime is realtime*(N/M). Is this correct

  841   Fri Oct 15 06:15:53 2021 Keita Mizukoshilivetime (or deadtime) of DRS4 evaluation board

Thank you very much.

Stefan Ritt wrote:

I would say not exactly, but it's a good approximation.

Keita Mizukoshi wrote:

Thank you very much for your response.
Excuse me for my very stupid confirmation.
If I take N events finally and the hardware scaler value is M, the livetime is realtime*(N/M). Is this correct

 

  842   Mon Oct 25 18:48:04 2021 Javier CaravacaTrigger multiple boards independently

Hello,

I recently acquired 4 DRS4 boards and I wanted to ask if it was possible to trigger them independently from the same computer.

I know that you can daisy-chain boards and trigger them all at the same time, but in my case, each of my boards record independent events, so I want them to trigger when trigger conditions are met in each board. I currently use the provided DRSOSC software, that can trigger on only the board that is being displayed at that moment. I tried opening several instances of DRSOSC to associate each to each board, but that is not possible since the second instance already does not find the boards. I wonder if there is a way of triggering from each board independently without having to use four computers.

Thank you,

Javier.

  843   Tue Oct 26 10:41:46 2021 Mehrpad MonajemExternal trigger and drs_exam

Hi Stefan,


I have two problems regarding using the drs_exam file with external trigger:


1- I connected a 200Khz signal with 20ns rising edge, 50 ohm load, and 27% duty cycle as an external trigger. The output of the drs_exam file starts from 0 to 200ns. Since I use an external trigger, I think it should be starting from 0 to 5ns and then again starting from 0. Could you please tell me where the problem is?

2- How is it possible to change from 1024 to 2048 bins in the drs_exam example?

 

You can find my code in the attachment.

Best regards,
Mehrpad

  844   Tue Oct 26 12:00:51 2021 Stefan RittExternal trigger and drs_exam

1. Why should your waveform start from 0 to 5ns? I don't get your point. Whenever you trigger a readout, you get a 200ns wide time window, and by definition it starts at zero.

2. In the software distribution you have a drs_exam_2048.cpp program. Note that your board needs to be physically modified before delivery to switch to 2048 bins.

Best,
Stefan

Mehrpad Monajem wrote:

Hi Stefan,


I have two problems regarding using the drs_exam file with external trigger:


1- I connected a 200Khz signal with 20ns rising edge, 50 ohm load, and 27% duty cycle as an external trigger. The output of the drs_exam file starts from 0 to 200ns. Since I use an external trigger, I think it should be starting from 0 to 5ns and then again starting from 0. Could you please tell me where the problem is?

2- How is it possible to change from 1024 to 2048 bins in the drs_exam example?

 

You can find my code in the attachment.

Best regards,
Mehrpad

 

  845   Tue Oct 26 12:02:56 2021 Stefan RittTrigger multiple boards independently

Unfortunately an independent operation from a single computer is not supported by the software. You can try to modify the drs_exam program and extend it. You can poll all boards in sequence and just read out that one which got a trigger, then start the loop again. But I don't know how good you are in programming. I needs a bit of experience to do that.

Stefan

Javier Caravaca wrote:

Hello,

I recently acquired 4 DRS4 boards and I wanted to ask if it was possible to trigger them independently from the same computer.

I know that you can daisy-chain boards and trigger them all at the same time, but in my case, each of my boards record independent events, so I want them to trigger when trigger conditions are met in each board. I currently use the provided DRSOSC software, that can trigger on only the board that is being displayed at that moment. I tried opening several instances of DRSOSC to associate each to each board, but that is not possible since the second instance already does not find the boards. I wonder if there is a way of triggering from each board independently without having to use four computers.

Thank you,

Javier.

 

  846   Tue Oct 26 15:05:18 2021 Mehrpad MonajemExternal trigger and drs_exam

Thanks for your reply.

1- I want to have a window size of 25.6ns instead of 200ns at 5GSPS. I have a 200khz high voltage pulser, which applies a pulse to my sample. I want to digitize the detector signal for each pulse (each pulse has a 25.6ns period). The pulser and digitizer use same 200khz trigger signal from each channel of the signal generator.

2- My DRS board has a 2048 combined stick on it. But the software distribution that I have doesn't contain the drs_exam_2048.cpp program. Could you please send the link that I can download this program? I can't find it under the link below.

link: https://www.dropbox.com/sh/clqo7ekr0ysbrip/AACoWJzrQAbf3WiBJHG89bGGa?dl=0

Best regards,

Mehrpad

Stefan Ritt wrote:

1. Why should your waveform start from 0 to 5ns? I don't get your point. Whenever you trigger a readout, you get a 200ns wide time window, and by definition it starts at zero.

2. In the software distribution you have a drs_exam_2048.cpp program. Note that your board needs to be physically modified before delivery to switch to 2048 bins.

Best,
Stefan

Mehrpad Monajem wrote:

Hi Stefan,


I have two problems regarding using the drs_exam file with external trigger:


1- I connected a 200Khz signal with 20ns rising edge, 50 ohm load, and 27% duty cycle as an external trigger. The output of the drs_exam file starts from 0 to 200ns. Since I use an external trigger, I think it should be starting from 0 to 5ns and then again starting from 0. Could you please tell me where the problem is?

2- How is it possible to change from 1024 to 2048 bins in the drs_exam example?

 

You can find my code in the attachment.

Best regards,
Mehrpad

 

 

  847   Tue Oct 26 23:18:32 2021 Javier CaravacaTrigger multiple boards independently

Thank you Stefan. Actually I noticed that the source code of drs_exam was available after I started this thread, and that was the solution that occurred to me too. I'll give that a try.

A related question is: if the 4 boards are triggering at max rate (500Hz), would the total data throughtput (of the four boards together) be 2GHz (500Hz x 4)? Or is the limitation on the readout, rather than the triggering?

Best,

Javier.

Stefan Ritt wrote:

Unfortunately an independent operation from a single computer is not supported by the software. You can try to modify the drs_exam program and extend it. You can poll all boards in sequence and just read out that one which got a trigger, then start the loop again. But I don't know how good you are in programming. I needs a bit of experience to do that.

Stefan

Javier Caravaca wrote:

Hello,

I recently acquired 4 DRS4 boards and I wanted to ask if it was possible to trigger them independently from the same computer.

I know that you can daisy-chain boards and trigger them all at the same time, but in my case, each of my boards record independent events, so I want them to trigger when trigger conditions are met in each board. I currently use the provided DRSOSC software, that can trigger on only the board that is being displayed at that moment. I tried opening several instances of DRSOSC to associate each to each board, but that is not possible since the second instance already does not find the boards. I wonder if there is a way of triggering from each board independently without having to use four computers.

Thank you,

Javier.

 

 

  848   Wed Oct 27 08:11:42 2021 Stefan RittTrigger multiple boards independently

I'm not sure if the rate would go up to 2 kHz (not 2 GHz!). Depends how the USB hub is designed. What you can do however is to buy 4 RaspberryPis (total cost 150$) and run everythign in parallel. The evaluation boards works nicely with the Pi's.

Javier Caravaca wrote:

A related question is: if the 4 boards are triggering at max rate (500Hz), would the total data throughtput (of the four boards together) be 2GHz (500Hz x 4)? Or is the limitation on the readout, rather than the triggering?

  Draft   Fri Nov 5 01:10:25 2021 Jiaolonghow to acquire the stop channel with 2x4096 cascading

 

Jiaolong wrote:

Hi Steffan,

    I have a question about how to acquire the stop channel: 

    Process:   Configure the Write Shift Register with 00010001b to achieve 4-channel cascading, then after a trigger, set A3-A0 to 1101, sclk keeps 0.

    Result:   the WSROUT pin keeps 0, the SROUT pin has no clock pulse as written in datasheet, but keeps always 1 or 0. It can be seen the stop channel is channel 0 or channel 1, but no situation to represtent channel 3 or channel 4. And if set sclk with 8 pulses, the  WSROUT and SROUT both keep 0.

    What should I pay attention to? Looking forward to your reply.

Jiaolong 

 

  850   Fri Nov 5 01:12:10 2021 Jiaolonghow to acquire the stop channel with 2x4096 cascading

Thanks for your advice. The problem has been solved by setting the srin again while reading out from srout.

Stefan Ritt wrote:

The problem must be on your side, since the Write Shift Register readout works in other applications with the DRS4 chip. So I can only speculate what could be wrong:

  • Do you really properly set the WSR? When you program it with 00010001b, add 8 more clock cycles and you should see the 00010001b pattern at WSROUT.
  • Do all tests with an oscilloscope, to avoid potential problems in your FPGA firmware (like an input configures as an output by mistake).
  • DWRITE must be high to see the contents of the WSR at the WSROUT pin, maybe that’s your mistake, see datasheet p 5 of 16.
  • To see the contents of the WSR at SROUT, A0-3 must be 1101b, please check with your oscilloscope
  • The addresses A0-A3 are simply connected to a multiplexer, so no clock is necessary after the addresses change

Stefan

Jiaolong wrote:

Hi Steffan,

    I have a question about how to acquire the stop channel: 

    Process:   Configure the Write Shift Register with 00010001b to achieve 4-channel cascading, then after a trigger, set A3-A0 to 1101, sclk keeps 0.

    Result:   the WSROUT pin keeps 0, the SROUT pin has no clock pulse as written in datasheet, but keeps always 1 or 0. It can be seen the stop channel is channel 0 or channel 1, but no situation to represtent channel 3 or channel 4. And if set sclk with 8 pulses, the  WSROUT and SROUT both keep 0.

    What should I pay attention to? Looking forward to your reply.

Jiaolong 

 

 

  851   Tue Nov 16 01:27:51 2021 Jacquelynne VaughanV3 board, only one channel works, all components at each channel input working

Hi everyone,

I'm still looking through the forum for an answer to this question, but thought I'd go ahead and post anyway just in case it hasn't been answered yet. If it has I can take this post down.

I have a V3 board, and as far as I can tell only channel 2 gives an output. If I enable other channels using the DRS Oscilloscope software, they do show static but will not show a signal if I connect one to them (e.g. a series of subsequent square waves). A technician and I took the board out and tested all the components leading up to the microcontrollers for each channel, and everything seemed to be working fine. I thought maybe it was configured to only have one channel read an output, but I looked through the Config panel in the software and nothing seemed to indicate that.

I am a novice, and maybe I'm missing something that I didn't see in the manual. I can post screenshots if needed!

Thank you for your help!

  852   Tue Nov 16 08:51:14 2021 Stefan RittV3 board, only one channel works, all components at each channel input working

A V3 boards is already 10 years old and out of warranty. The software has no configuration to turn channels off except the channel buttons on the main page on top of the sliders. I presume the channels are broked due to some overvoltage applied to them (the V5 board is better protected against over voltage). You can send it the board for repair, but it will cost almost the same amount of money than buying a new boards.

Regards,
Stefan

Jacquelynne Vaughan wrote:

Hi everyone,

I'm still looking through the forum for an answer to this question, but thought I'd go ahead and post anyway just in case it hasn't been answered yet. If it has I can take this post down.

I have a V3 board, and as far as I can tell only channel 2 gives an output. If I enable other channels using the DRS Oscilloscope software, they do show static but will not show a signal if I connect one to them (e.g. a series of subsequent square waves). A technician and I took the board out and tested all the components leading up to the microcontrollers for each channel, and everything seemed to be working fine. I thought maybe it was configured to only have one channel read an output, but I looked through the Config panel in the software and nothing seemed to indicate that.

I am a novice, and maybe I'm missing something that I didn't see in the manual. I can post screenshots if needed!

Thank you for your help!

 

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