 Thu Mar 22 14:36:01 2018, Phan Van Chuan, Read the CalibrateWaveform
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Helo
I'm building an application for reading waveforms from the DRS4 board to PC. However, I am having problems reading calibration data from EEPROM
on DRS4 board. The calibration data is read through the function reference: |
 Fri Mar 23 09:39:55 2018, Stefan Ritt, Read the CalibrateWaveform
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You don't have to read and calibrate the waveforms in your user code, but can rely on the DRS.cpp library to do that. Just look at the drs_exam.cpp
program coming with the distribution. It uses the function b->GetWave() to retrieve the calibrated waveform. If you like, you can look into that function
to learn how to apply the calibration, but I can tell you that it's a bit complicated. Since each event starts at an arbitrary stop cell in the DRS4, |
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Fri Mar 2 18:08:55 2018, Steven Block, ROI
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Hello,
I have a question about how ROI works. From what I have read, it will only save data that ocurs some time |
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Fri Mar 2 20:17:17 2018, Stefan Ritt, ROI
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N'/N is correct. The 2 us "from the response you got from me" come from the fact that after readout, you have to start the DRS4 again.
During this time, the power supply usually becomes slightly unstable, and it takes on the evaluation board about 2us to stabilize it again. Tha't why
I add the 2 us. If you don't care about slight offset effect, or if you make a better power supply, you dead time would be 10*30ns = 300ns for 10 samples. |
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Fri Mar 2 21:05:48 2018, Steven Block, ROI
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Great! That is very helpful.
One more question. If no signals were detected in the 1024*200ps time frame in ROI mode, would the DRS4 go dead for 32us (or 30us depending on
the supply) for, or would it dump the earliest events in the buffer for the more recent ones until it detects a signal to readout? Or rather, does |
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Mon Mar 19 16:22:42 2018, Stefan Ritt, ROI
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The DRS4 has an internal storage of 1024 capacitors. They work as a ring buffer, so at 5GSPS you can store 200ns wide signals. After 200ns, the first
samples are overwritten by new samples, so you always have the last 200ns of samples stored. Once you trigger the DRS4, this buffer is frozen, and the
readout of this buffer causes the dead time. No trigger, no dead time. Hope this answers your question. |
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Wed Mar 14 00:38:15 2018, Will Flanagan, sub-ms precision timestamps?
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Dear DRS4 community,
Is there a way to extract timestamps with sub-ms precision? The milliseconds of an event is clearly given when unpacking the header. I would
like to determine how far apart events are when they are within the same millisecond. |
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Thu Mar 15 08:44:26 2018, Stefan Ritt, sub-ms precision timestamps?
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Putting sub-ms precision into the header does not make sense, since the USB transfer only happens in time-slots of about 2 ms. To get better timing,
you would need a hardware time clock in the FPGA, which does not exist right now.
Best, |
Tue Feb 27 16:34:26 2018, Steven Block, DRS4 Dead times 6x
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Hello All,
I am currently trying to figure out how to properly characterize the dead time of the DRS4 board. My most recent experiment to try and answer
this question involved using an external trigger that can range from 1Hz to 2MHz. I fed this trigger into the DRS4 and collected 1000 samples with no input |
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Tue Feb 27 17:04:12 2018, Stefan Ritt, DRS4 Dead times
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XML is very slow to write, and you are probably limited by that. Switch to binary mode, which is much faster. You will see in the end a maximum rate
of ~500 Hz, and thus a dead time of 2ms, independent of the sampling speed. Note that you have only an evaluation board, which is optimized for ease of
use. If you develop your own electronics, and do optimized readout, you can bring the deadtime down to 30ns x number of samples + 2us, or 32us if you read |
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Tue Feb 27 18:04:18 2018, Steven Block, DRS4 Dead times
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That is extremely helpful! Many thanks. One more question; If I were to take inputs from 2 channels at once, would that scale the dead time to 64us
using your example?
Steven |
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Tue Feb 27 18:12:32 2018, Stefan Ritt, DRS4 Dead times
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For applications which are critical on the dead time, one typically uses one ADC per DRS4 channel, and thus the dead time stays at 32us. If you multiplex
two DRS4 channels into one ADC channel, then it goes to 32us.
Stefan |
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Thu Jan 25 05:24:05 2018, chen wenjun, problem with the drscl(drs507)
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Hi! Stefan:
when I change a new computer(win7,64bit),I meet a problem that the drscl app cannot found the board! It shows"USB successfully scanned,but
no boards found",but the drsosc runs well . when I connect to other win7*64bits computer,only one of them runs property! Is there any driver else |
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Thu Jan 25 08:00:16 2018, Stefan Ritt, problem with the drscl(drs507)
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This problem has been reported by several people, like elog:551
So far I could not solve it. On the computers at our lab it works find so I cannot reproduce and fix the problem. One suspicion I have is that
the underlying libusb library needs to be updated. You can try to install the newest version from their website at http://libusb.info/, but I haven't |
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Thu Jan 25 08:07:32 2018, chen wenjun, problem with the drscl(drs507)
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I have tried about 4 computers,only one worked fine.I truly want to know how others get this fixed,can you get in touch with them?
Stefan
Ritt wrote:
This problem has been reported by several people, like |
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Tue Mar 28 21:53:12 2017, Jim Freeman, drscl doesn't find eval board but drsosc does (Windows 7)
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I cannot find the EVAL board using drscl version 5.06 while the drsosc works fine. I tried 2 different eval boards and 2 different computers and the
same effect. I looked under device manager at the libusb and the drs4 was there, and checked the driver which was found to be up to date. |
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Wed Apr 5 12:28:28 2017, Stefan Ritt, drscl doesn't find eval board but drsosc does (Windows 7)
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Two people report now this problem, while this works fine at our lab. So I'm puzzled right now.
I attach two screenshots from the device manager and the Command Line interface. Can you compare it with what you see? Which is the firmware
version of your evaluaiton board? |
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Thu Jan 25 06:10:52 2018, chen wenjun, drscl doesn't find eval board but drsosc does (Windows 7)
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Hi! Jim:
It seems that I meet the same question with you ,and I am confused ,have you find out the reason about this problem?Or can you tell me
how you deal with it? |
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Wed Jan 17 09:51:16 2018, Tran Cong Thien, The input signals recorded are different with the signal showed in oscilloscope
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Dear Stefan,
I am using an DRS4 board to record the signals from an plastic scintillator detector. It was working really good, yet a few day ago the signals
became "not right". When I checked the signal using an oscilloscope it show the normal signals previously recorded. The signal amplitude |
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Wed Jan 17 10:09:09 2018, Stefan Ritt, The input signals recorded are different with the signal showed in oscilloscope
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First thing is to do another voltage calibration. Disconnect input, "Config", "Execute Voltage Calibration". If this does not fix
the problem, the board is probably broken. This can happen if you send very high input singals to the board (like >10V) and exceed the maximul allowed
limit from the datasheet. In that case the board needs to be repaired. Please contact me directly (via email) so that we can make you a quote. |
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Tue Mar 26 01:17:59 2013, Jill Russek, cascading -- DRS4 Osci.cpp & DRS.cpp
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All I'm trying to do is cascade one input signal, though all available channels, so that I end up with 8*1024 bins per event.
Here is the read out on my board/chip: |
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Thu Apr 4 11:32:21 2013, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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Jill Russek wrote:
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Fri Apr 5 02:21:33 2013, Jill Russek, cascading -- DRS4 Osci.cpp & DRS.cpp
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Stefan Ritt wrote:
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Fri Apr 5 08:54:37 2013, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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Jill Russek wrote:
Would it be possible to just hardcode a few lines in the SetChannelConfig in DRS.cpp method as such: |
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Wed Apr 10 22:41:21 2013, Jill Russek, cascading -- DRS4 Osci.cpp & DRS.cpp
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Stefan Ritt wrote:
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Thu Apr 11 08:39:12 2013, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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Jill Russek wrote:
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Thu Apr 11 23:32:57 2013, Jill Russek, cascading -- DRS4 Osci.cpp & DRS.cpp
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Stefan Ritt wrote:
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Fri Apr 12 08:25:05 2013, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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Jill Russek wrote:
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Wed Dec 20 15:30:38 2017, Yoni Sher, cascading -- DRS4 Osci.cpp & DRS.cpp
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Hi,
I'm trying to do the same thing (get 1 channel with 8192 bins), but I'm having some trouble with it. When I call SetChannelConfig(0,
8, 1) as suggeted, I get output that looks like noise on all readouts. Could you please explain what is supposed to happen in this case? |
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Wed Dec 20 16:21:42 2017, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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First you need a board which is modified in hardware to support channel cascading. Basically there are internal resistors which connect each input connector
to two channels. You have to specify this when you order the board. Then you can use the new drs_exam_2048.cpp file contains in the git repository which
correctly configures and reads out the board in two-channel cascading mode. Putting all 8 channels together is not supported by the evaluation boards. |
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Wed Dec 20 16:30:45 2017, Yoni Sher, cascading -- DRS4 Osci.cpp & DRS.cpp
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Hi,
The board is modified (and checks out with the DRSScope program). Could you please point me to the drs_exam_2048.cpp file? I can't seem to
fine the most up-to-date git repository.... |
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Wed Dec 20 22:14:35 2017, Stefan Ritt, cascading -- DRS4 Osci.cpp & DRS.cpp
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https://bitbucket.org/ritt/drs4eb
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Tue Dec 12 00:25:50 2017, Diego Yankelevich, External trigger using Raspberry Pi
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Dear Steffan:
We have been able to use the DRS4 using a Raspberry Pi but we have not been able to use the external trigger. What we are doing is basically
comment out the code shown below (downloaded from PSI) to use the hardware trigger and uncomment the code to use the external trigger. We have not been |
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Tue Dec 12 13:58:06 2017, Stefan Ritt, External trigger using Raspberry Pi
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Indeed the code does not work for the current evaluation board, it has been written for a previous version and never been updated. Please use following
code to enable the external trigger
/* use following lines to enable the external trigger */ |
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Thu Nov 16 02:55:44 2017, Diego Yankelevich, Averaging capabilities
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The Display window in the Oscilloscope software shows averaging capabilites but I have not been able to activate these. Is it possible to activate averaging
with the existing oscilloscope software? Thanks |
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Wed Nov 22 14:52:31 2017, Stefan Ritt, Averaging capabilities
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This feature is not yet implemented. The (disabled) software swtich is more like a kind of a reminder to myself to work on that one day...
Diego
Yankelevich wrote:
The Display window in the Oscilloscope software shows averaging |
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Wed Nov 22 08:31:03 2017, chen wenjun , using of the DRS Command Line Interface
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Hello! I'm using DRS4 evaluation board V5 with the drs command line interface,but the mannal only explained the meaning of the command--"info".And
I can't get the hang of the use of other commands through "help",so is there anywhere can I learn more about other commands?Or I can only
learn it through the datasheet of DRS4 chip. |
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Wed Nov 22 08:48:36 2017, Stefan Ritt, using of the DRS Command Line Interface
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The command line interface is more a debugging tool for experts, and you are not supposed to use it except to test the connection to the evaluation board.
The programs for the user are the DRS Oscilloscope and the drs_exam.cpp example program to read out the board with your own program.
Stefan |
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Wed Nov 22 08:58:33 2017, chen wenjun , using of the DRS Command Line Interface
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OK!Thank you! One more question,when I use the Oscillocope ,I found that the actual speed is a constant value of 1.007G,how can change this speed.
Stefan
Ritt wrote:
The command line interface is more a debugging tool for experts, and |
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Wed Nov 22 09:14:18 2017, Stefan Ritt, using of the DRS Command Line Interface
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Remove the check mark from the "Lock" box and enter a different value in the sampling speed box and hit return.
chen
wenjun wrote:
OK!Thank you! One more question,when I use the Oscillocope ,I found |
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Wed Nov 22 09:19:11 2017, chen wenjun , using of the DRS Command Line Interface
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Thank you very much !! All my fault for I thought it too comlicated. Thank you sincerely!
Stefan
Ritt wrote:
Remove the check mark from the "Lock" box and enter a different |
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Fri Nov 3 12:11:14 2017, Håkan Wennlöf, Triggering using AND
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Hi!
I'm using the DRSOsc program, and I have a question that I need a bit clarified;
When triggering using AND between two channels, am I then triggering on rising/falling edge of both channels, or on the actual values? |
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Fri Nov 3 13:28:04 2017, Stefan Ritt, Triggering using AND
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Think about: How would you make a coincidence (AND) between two edges? Since an edge is infinitesimally small, there is no way to make a meaningful coincidence
between edges. Therefore, the DRS4 EB firmware makes a simple AND of levels. If you trigger on rising signals and do an AND, then you get a trigger if
both values are above their threshold. For falling edge trigger (arrow goes down in the trigger configuration) the board triggers when both signals are |
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Tue Oct 17 14:58:58 2017, Vadym Denysenko, Time offset
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Hello.
I have a simple question, can I set SetTriggerDelayNs() more than 1631 ns? |
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Wed Oct 18 09:12:26 2017, Stefan Ritt, Time offset
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No this is not possible. But you can delay your signal externally (like with a delay cable or electronically) and then send the dealyed signal to the
evaluation board for triggering.
Stefan |
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Wed Oct 18 11:48:14 2017, Vadym Denysenko, Time offset
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Thank you for your reply!
Stefan
Ritt wrote:
No this is not possible. But you can delay your signal externally (like |
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Fri Oct 13 03:39:01 2017, Jonathan Wapman, Raspberry Pi Connection Failure
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I am currently attempting to use a raspberry pi to connect to the DRS 4 board. I whenever I try to use the DRS Command Line TOol, Revision 21435 to connect
to the drs board, I get the error
"musb_open: libusb_open() error -3" |
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Mon Oct 16 15:35:22 2017, Stefan Ritt, Raspberry Pi Connection Failure
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Have you tried as root? Maybe you miss some permissions.
Stefan
Jonathan |
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Wed Sep 27 16:11:03 2017, Yoni Sher, Event acquisition pace for irregular timing
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Hi,
I'm running a LIDAR application that requires that every outgoing pulse be captured. My current setup firess sets of 20-50 pulses at
1 ms intervals, about 10 times a second, but only 10-20 pulses a second are captured. |
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Mon Oct 2 16:08:05 2017, Stefan Ritt, Event acquisition pace for irregular timing
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As written in the documentation, the DRS evaluaiton board has a maximum trigger capability of ~500 Hz. This is limited by the USB bus which has a finite
data transfer rate. If you build your own electronics around the chip (like many other groups are doing), you can squeeze this to a few kHz, but it is
some development effort. |
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Sun Aug 27 12:44:16 2017, Yuvaraj Elangovan, DRS4 version Support
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| Hi i am using DRS4 Eval Board V2, How to acquire data to a bin file using it. |
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Fri Jul 21 09:16:02 2017, Volodymyr Rodin, Time output
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Hello Stefan
I tried to convert binary to a simple txt file and found next problem - strange time output.
Here is output from little modification for read_binary.cpp (Its last output line also is strange: dT = -1.#IOns +- -1.$ps) |
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Tue Jul 25 14:47:05 2017, Volodymyr Rodin, Time output
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Hi again.
Okay, it works with 5.05 version very good and it is enough for me.
Besides, |
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Fri Jun 16 17:34:20 2017, Laura Gonella, Driver installation on Windows 10
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Hello,
I am trying to get a DRS4 board to run on Windows 10. I am having problems with the driver installation. I am getting the follwoing message
"There is no driver selected for the device information set or element" |
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Thu Jul 20 13:00:44 2017, Volodymyr Rodin, Driver installation on Windows 10
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Dear Laura
You need to disable driver signature enforcement. Then try again with path option.
It helped me. |
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Wed Jul 12 04:24:39 2017, Toshihiro Nonaka, Time resolution between boards
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Hello,
I 'm using four evaluation boards v.3 to construct the multi-board DAQ system. One channel for each board is used as reference clock, then
calibrate timing offline, which allow below 10ps resolution between boards. |
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Wed Jul 12 20:16:05 2017, Stefan Ritt, Time resolution between boards
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Yes this should be possible.
Stefan
Toshihiro |
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Thu Jul 6 15:10:48 2017, Esperienza Giove, Trigger setting (AND AND) OR (AND AND)
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Hello there,
is it possible to setup trigger in double AND configuration (a pair in and or other pair in and).
eg (CH 1 AND CH 2 ) OR ( CH 3 AND CH4) |
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Fri Jul 7 10:31:47 2017, Stefan Ritt, Trigger setting (AND AND) OR (AND AND)
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Unfortunately not with the current firmware.
Stefan
Esperienza |