 Tue Sep 5 03:28:52 2023, Matias Henriquez, Input range switch added in Version 2.1.3
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Hello,
It is not quite clear to me yet how the input range is only determined by the front end and not the DRS4 chip. According to the datasheet, the
selection of ROFS determines whether the input differential range is -0.5V to 0.5V (ROFS=1.55V) or 0V to 1V (ROFS=1.05V) or -0.05V to 0.95V (ROFS=1.1V). |
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Wed Sep 13 13:18:45 2023, Stefan Ritt, Input range switch added in Version 2.1.3
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To achieve an input range of -1V to 0V, you need an external buffer which can shift this range into the DRS4 range of -0.5V to +0.5V. This external buffer
has then to operate with bipolar power supplies, like -2.5V to +2.5V, which are not present on the evaluation board.
Best regards, |
 Mon May 22 18:27:56 2017, Esperienza Giove, Invalid magic number 0000
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Hello everybody!
After some times i init my board, or if i stop the program during the acquisition, i get the error message "Invalid magic 0000". The
only way i can solve this problem is to physically disconnect and plug in again the USB cable. |
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Tue May 23 10:24:47 2017, Stefan Ritt, Invalid magic number 0000
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Under linux, many people observed that the USB connection is unstable to the evaluation board. This must be related to the linux USB stack, since my
code runs fine under MacOSX and Windows, where I use the same USB library (libusb-1.0). So I can't do anything from my side. Baybe the linux system
has some tools to reset an USB endpoint. I googled it and found some proposals here: |
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Thu May 25 20:17:41 2017, Esperienza Giove, Invalid magic number 0000
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Hello, thanks for your answer. Unluckily if i try to reset in this way it keeps hanging
musb_write: requested 10, wrote 0, errno -7 (Unknown error 18446744073709551609)
musb_read error 0 |
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Thu May 25 20:20:57 2017, Esperienza Giove, Invalid magic number 0000
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Hello, thanks for your answer. Unluckily if i try to reset in this way it keeps hanging
musb_write: requested 10, wrote 0, errno -7 (Unknown error 18446744073709551609)
musb_read error 0 |
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Fri May 26 08:48:25 2017, Stefan Ritt, Invalid magic number 0000
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There is no other way to reset the board. As I said, people running this under Windows or MacOS are fine, so maybe this calls for a change of OS.
Esperienza
Giove wrote:
Hello, thanks for your answer. Unluckily if i try to reset in this |
Sat May 23 11:03:20 2015, Felix Bachmair, Issue with Trigger rates below ~100Hz 
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Hi
We are working with the DRS 4 V5 version and we investigated an issue with the trigger at rates below ~120 Hz.
As long as we have a trigger rate of more than 125 Hz. everything seems to work fine and we are recording more or less all events. |
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Thu Jul 2 08:53:17 2015, Felix Bachmair, Issue with Trigger rates below ~100Hz
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Hi,
We did a further investigation of this problem:
We figured out that this issue seems to be related to the kernel. |
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Tue Jan 31 01:37:35 2017, VO HONG HAI, LLD and ULD discriminations,
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Dear Stefan,
Is there any way to develop LLD and ULD discrimination in DSR-4 evaluation board?
Best regards,
V.H.Hai |
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Tue Jan 31 08:40:04 2017, Stefan Ritt, LLD and ULD discriminations,
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Not inside the board. Each channel has a single discriminator. You can select to trigger on a rising or falling edge, but you don't have two levels.
What you can do however is to make an external trigger, like using old NIM logic. You can make discrimaiton with different levels and use a coincidence
unit to combine them. Then feed the trigger into the external trigger input of the evaluation board (5V TTL level, not NIM level!). |
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Wed Mar 9 09:57:20 2016, Christian D, LabView
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Hi,
I would like to use the DRS4 board with LabView for fast readout.
Do you know anyone who has written a VI for that? |
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Fri Nov 18 16:38:42 2016, Gerard Montarou, LabView
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Hello,
Did you start to write some VI to interface DRS4board with labview ?
i also have in mind to do that.I am surprised that nobody alraedy did it since there is no answer toyour question |
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Mon Aug 13 19:44:59 2018, Martin Petriska, Latch delay support
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Hi,
https://forge.physik.rwth-aachen.de/projects/drs4-rwth
Not sure about their licensing, but is it possible to add latch delay support to official firmware ? |
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Tue Aug 14 06:10:49 2018, Stefan Ritt, Latch delay support
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I put that on the wish list, but I won't have time for that in the next months.
Stefan
Martin |
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Tue Nov 3 22:37:56 2015, Will Flanagan, Latest macro for DRS4 V5
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Hi DRS4 Experts,
I have an extremely naive question: Is there any official macro to unpack the DRS4 binary files? All I am looking to do is to plot a few of my
waveforms and manipulate them in root. I am using OSX 10.10 and ROOT 5.34. |
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Tue Nov 3 23:15:38 2015, Will Flanagan, Latest macro for DRS4 V5
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I should of course mention that I looked through the DRS4 website and didn't see anything obvious: https://www.psi.ch/drs/evaluation-board
Thanks,
Will |
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Wed Nov 4 15:40:10 2015, Stefan Ritt, Latest macro for DRS4 V5
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Have a look here: elog:361
Will |
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Thu Nov 5 00:18:42 2015, Will Flanagan, Latest macro for DRS4 V5
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Hi Stefan,
This is absolutely perfect.
Thanks, |
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Mon Nov 28 22:28:34 2016, Randall Gladen, Long timing between two channels
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I don't believe I fully understand how the timing works between multiple channels on DRS4 board, even after reading the manual, but I am hoping to
measure a time difference between two channels longer than 1024/sampling rate. So far, I have written a program in Matlab to extract timing and voltage
information from the binary file to find the time difference between two channels that are set with the AND trigger logic and appear within approximately |