 Wed Apr 19 12:17:25 2017, Stefan Ritt, Wave rotation during transfer from the board?
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This is correct. Actually the amplitude array is rotated already inside the DRS4 chip. So the readout starts with the stop cell plus one. If you do not
do anything, the waveform is already "rotated". If you want the waveform to start with physical cell #0, you have to "unrotate" it.
Stefan |
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Thu Apr 20 06:30:13 2017, Strahinja Lukic, Wave rotation during transfer from the board?
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Thanks.
Strahinja
Stefan |
 Tue Feb 27 13:17:00 2018, Steven Block, WIndows Connection problem with drs507 SOLVED
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Hello All,
I too have been struggling with trying to get the drs4 (507) to work on my windows machine and I found it to be a problem with the libusb library.
My solution is as follows and has worked on multiple PC's. I ran this solution after I first plugged in the drs4 and installed 507. |
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Tue Feb 27 13:29:47 2018, Stefan Ritt, WIndows Connection problem with drs507 SOLVED
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Dear Steven, many thanks for this information, this is very useful. I know of people having problems on Windows 10, maybe this will also help them.
Stefan
Steven |
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Wed May 9 14:07:10 2018, Alec Shackleford, WIndows Connection problem with drs507 SOLVED
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Thank you for this fantastic solution. I had almost reinstalled windows 7 to see if that would solve the issue!
All the best, |
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Mon May 14 09:21:29 2018, Alessio Berti, WIndows Connection problem with drs507 SOLVED
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Hi,
I have a machine with Windows 10 and the solution provided by Steven works fine. To give more details, the driver installed in my case is WinUSB
(i.e. libusb, v6.1.7600.16385). |
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Fri Apr 13 18:14:07 2018, Alessio Berti, Voltage and Timing Calibration in drs_exam.cpp
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Hi,
we were trying to implement an automatic way to calibrate our DRS4 both in voltage and in time (we have the V5 Evaluation Board). We started
from drs_exam.cpp and tried with the following lines: |
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Fri May 4 11:56:08 2018, Stefan Ritt, Voltage and Timing Calibration in drs_exam.cpp
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Have you set the sampling frequency
b->SetFrequency(5, true);
before the calibration? |
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Wed Oct 7 13:06:34 2015, Ilja Bekman, Voltage Calibration with signal on the input
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Wed Oct 7 17:58:20 2009, Stefan Ritt, VDD switch off speed 
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It turned out that the VDD switch off speed plays some important role. On our VME board, we have a linear regulator, then a 4.7 uF capacitor, then the
DRS4 chip (DVDD and AVDD). When switching off the VME power, it takes quite some time to discharge the 4.7 uF capacitor, since the DRS4 chip goes into
a high impedance mode if VDD < ~1V. This gives following VDD trace: |
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Tue Oct 6 11:20:39 2009, Stefan Ritt, VDD instability
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It has turned out that the stability of the AVDD and DVDD power supplies for the DRS4 are very critical. On the evaluation board I use a REG1117-2.5,
on our VME board I use a ADP3338-2.5 for the DVDD power supply. When the domino wave is started, the power consumption of the DRS4 chip jumps up by ~40
mA, which has to be compensated by the linear regulator. Following screen shot shows what happens: |
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Tue Nov 16 01:27:51 2021, Jacquelynne Vaughan, V3 board, only one channel works, all components at each channel input working
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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. |
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Tue Nov 16 08:51:14 2021, Stefan Ritt, V3 board, only one channel works, all components at each channel input working
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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. |
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Wed Jan 6 15:51:58 2016, Larry Byars, Use of Channel Cascading in drs_exam.cpp
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Hello Stefan,
Here in Rockford, TN we just got a new DRS4 evaluation board (Serail # 2612, Board Type 9, Firmware 21305) which is labeled as combined 2048.
It looks like the drs_exam.cpp only works with 1024 samples per channel. We'd like to be able to get 2048 samples from each of the four channels |
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Tue Jan 12 15:42:31 2016, Larry Byars, Use of Channel Cascading in drs_exam.cpp
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An update. I have been successful in making modifications to drs_exam.cpp so that I can get 2048 samples per channel.. The main changes were to the size
of the time_array and wave_array and adding a call to Set ChannelConfig(0,8,4). It was also necessary to change the parameters to GetWave so that the Trigger
Cell and WSR values were passed to get the channel combinations correct (2048 channel.ppt). |
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Tue Jan 12 16:06:07 2016, Stefan Ritt, Use of Channel Cascading in drs_exam.cpp
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Hi Larry,
sorry my late reply, swamped with work here. You were right in the modifictions you did, congrats. The speed limitation of 500 events come from
USB2, which simply is not fast enough. The 500 Hz are mentioned on the evaluation board web site, so you should have seen that before ordering. Some people |
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Wed Apr 7 03:29:39 2021, Sean Quinn, Unexpected noise in muxout: t_samp related?
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Dear DRS4 team,
I'm experiencing some issues that seem to be isolated to the ASIC, and would like to understand if we are doing something wrong. There are
several items to address in the post. |
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Wed Apr 7 08:26:12 2021, Stefan Ritt, Unexpected noise in muxout: t_samp related?
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Dear Sean,
noise in transparent mode comes from some coupling to your system clock. But 3.5 mV RMS seems rather hight to me. You should get it to below
1 mV if the DRS4 input is clean (try to short it). |
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Fri Apr 9 20:22:13 2021, Sean Quinn, Unexpected noise in muxout: t_samp related?
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Hi Stefan,
Thanks much for the quick reply. Ok, yes, things do seem ok after the offset calibration. I am running into some other issues I could use your |
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Fri Apr 9 20:55:28 2021, Stefan Ritt, Unexpected noise in muxout: t_samp related?
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If you do the cell calibration correctly, your noise should be ~0.4 mV. You seem to be 2-3x larger. The periodic negative spikes come if you dont'
sample at the right time. Adjust t_samp until they are gone.
Stefan |