 Sun Mar 6 17:54:47 2022, Matias Senger, Why does not trigger at higher sampling frequencies?
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I have connected 3 signals to the DRS4 Evaluation Board V5 which look like this in the drsosc app:
Note that here I am sampling at 5 GS/s. Using this app everything works perfect. |
 Tue Mar 8 00:25:56 2022, Matias Senger, Why does not trigger at higher sampling frequencies?
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I have seen in the app that the trigger source buttons do something different than the "or" and "transparent trigger" buttons:
If I enable the setup from the right, i.e. OR in CH4 and "Enable Transparent Trigger" the app stops triggering. This is the configuration |
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Tue Mar 8 12:20:00 2022, Matias Senger, Why does not trigger at higher sampling frequencies?
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Sorry for the spam. Just want to let you know that I was able to solve the problem, it was all due to a `float` being casted as `int` in the Python binding.
Now it works like a charm.
Matias |
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Fri Mar 11 17:26:15 2022, Matias Senger, Time calibration and the C++ API
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I am using the V5 board at a fixed sampling frequency. With the `drsosc` app I have executed the time calibration at 5 GS/s (actually 5.12 GS/s). This
is how my setup looks like in the app:
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Sat Mar 12 16:52:36 2022, Matias Senger, Time calibration and the C++ API
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Dear Stefan,
For the time of each bin I am using the values returend by `GetTime` without any assumption by my side. I did not notice before that the sampling
time is not uniform, but I see that this is already happening. This is an example plot from one of the signals I processed: |
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Tue Mar 15 13:07:50 2022, Matias Senger, Time calibration and the C++ API
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Thanks for your help. If I look into the app the behavior for the 4 channels is exactly as you show:
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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). |
Fri Dec 20 20:35:31 2024, Matias Henriquez, Problem with C++ script to use DRS4 evaluation board. Not taking data. 
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Hello,
I need to write a script in C++ to take data using the DRS4 evaluation board v4. For that, I used the drs_exam.cpp example as a reference. This
is my code (see attachement 2), which is very similar to the provided example, however the difference is that I need to trigger on CH1 OR CH2. In the next |
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Mon Dec 23 19:31:31 2024, Matias Henriquez, Trigger OUT pulse width variable from 100 us up to 100 ms
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Given this new scenario, what is the maximum rate of events that can be processed then (a rough estimation would be great, 1/2ms?)? is it mainly limited
by the USB data transmission and the PC? How does the logic of the trigger and DRS4 data sampling works inside the FPGA in general terms? e.g: trigger
activated -> dwrite ON -> ADC acquisition -> busy until data has been shipped off to the PC -> free to process new events. |
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Fri Dec 27 22:04:48 2024, Matias Henriquez, Problem with C++ script to use DRS4 evaluation board. Not taking data.
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Hello, some updates:
4. I was able to capture correct waveforms using c++ code. I needed to use the function SetTriggerDelayNs() to properly capture
my waveforms. |
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Wed Jun 1 09:57:43 2011, Martin Petriska, Removing spikes
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I have DSR4 eval board. Found that there are spikes in channels. Procedure Osc::RemoveSpikes to remove them looks litlle dificult. There is simple way,
if you doesnt need to measure all 4 channels.Spikes are in all channels, and it looks like they are same in time and value between channels. To remove
them, if you are not using one channel, substract that unused channel with spikes from used channel and your data will be without spikes. If you need all |
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Tue Mar 20 16:23:33 2012, Martin Petriska, triger for measuring time between pulses in channels
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I have two BaF2 detectors with PMT connected to Ch1 and Ch2. At this time Im using external triger module to start DRS4. My evalution board is
version 3 so I have no possibility to trigger on two or more pulses occurence on different channels. But I have this idea, trigger with analog trigger
on channel 1 (start detector) will start measurement on all channels. After that using FPGA inside EVM to look if some value in Ch2 is bigger as treshold |
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Wed Mar 21 09:33:00 2012, Martin Petriska, triger for measuring time between pulses in channels
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Stefan Ritt wrote:
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Mon Oct 29 18:30:28 2012, Martin Petriska, GetWave
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I have some question according to GetWave function. In drs_exam.cpp simple GetWave(0,0,wave_array[]) etc...is used. Is there primary (cell) calibration,
secondary calibration (Readout) and remove Spikes used, as in DRS Oscilloscope application? |
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Thu Dec 6 09:23:36 2012, Martin Petriska, EVM rev4 board trigger change and drs_example
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I switched from rev 3 to rev 4 board, but have some problems with triggering, board is now waiting for trigger (rev.3 is working). How to do in
drs_exam.cpp for example triggering on Ch0 && CH1 ?
Software 4.0.0, windows version. |
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Wed Feb 13 16:58:40 2013, Martin Petriska, Nonuniform sampling
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Are there any plans to include reconstruction of nonuniform sampling in DRS4 to get uniformly sampled data?
Im now reading article IEEE Trans on Circ. ans Systems I, Vol.55 No.8 sept. 2008 Reconstruction of Nonuniformly Sampled Bandlimited Signals Usinga
Differentiator–Multiplier Cascade by Stefan Tertinek and Christian Vogel |
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Tue May 21 13:32:13 2013, Martin Petriska, mac osx 10.6
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> Hi,
>
> I would like to use the DRS4 with my macbook pro running osx 10.6.8.
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Thu Jan 9 10:58:19 2014, Martin Petriska, v5 software with v4 board calibration
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Hi
Question:
In v4 board, which channel has best calibration ? |
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Thu Aug 21 11:03:36 2014, Martin Petriska, 10GSps on DRS4 Evm with delay cables
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Hi, I read its possible to use channels 2,4,6 to extend 200ns to 400ns (1024bins to 2048).
Is it possible to use same channels to double sampling rate with paralel feeding, one channel delayed by Ts/2, for 5,12GS/s is it cca 3cm delay
cable? |
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Wed Aug 19 15:07:53 2015, Martin Petriska, QtPALS
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There is software for DRS4 board and positron lifetime measurement availiable. Still in beta but works. Its usable for measuring time between
pulses in two or three channels and histogramming that time. (May be time of flight measurement should be tested too) Project code is here: http://sourceforge.net/projects/qtpals/.
More about it is here http://iopscience.iop.org/1742-6596/505/1/012044/. |