 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 |
 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 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 Oct 21 14:43:21 2013, Stephane Debieux, DRS4 analog outputs - interfacing DRS4 to AD9222 ADC
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Hi,
I wish to interface the DRS4 with the 8-channel ADC AD9222 (or AD9637).
I'm reading from the DRS4 datasheet that "the analog output of the DRS4 chip has been designed to match directly the input of the AD9222". |
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Tue Oct 7 14:09:02 2014, Stephane Debieux, USB Microcontroller firmware
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Hi,
I'm trying to recompile the USB microcontroller firmware starting from the drs_eval.c file but I'm not able to get a .iic file close to the one
provided with the eval board. It seems to me that this drs_eval.iic file does not match the drs_eval.c and drs_eval.hex files or that I'm doing something |
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Mon Oct 13 17:08:40 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Tue Oct 14 16:21:07 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Tue Oct 14 16:34:45 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Tue Oct 14 16:51:37 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Mon Dec 15 13:37:38 2008, Stefan Ritt, Welcome
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Welcome to the DRS4 Discussion Forum. This forum contains information and discussions related to the DRS4 chip. Please subscribe to this forum
to receive automatic email updates. If you have any technical questions, please feel free to post it here. |
Wed Jan 14 12:02:04 2009, Stefan Ritt, External Trigger Input requirements 
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Several people mentioned that the external trigger input (TTL) does not work on the DRS4 Evaluation Board Rev. 1.1. This is not true. The requirement
however is that the input signal must exceed approximately 1.8V. Since the input is terminated with 50 Ohms, not all TTL drivers may deliver enough current
to exceed this threshold. To verify this, the trigger signal can be monitored with an oscilloscope at test point J24. Only if the input signal exceeds |
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Wed Jan 14 13:41:44 2009, Stefan Ritt, External Trigger Input requirements
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Another tricky issue comes from the fact that the external TTL trigger and the comparator are in a logical OR. So if the comparator level is set
such that the signal is always over the threshold, the trigger is always "on" and the TTL trigger does not have any effect. It is therefore necessary |
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Wed Feb 11 12:21:07 2009, Stefan Ritt, Corrected datasheet Rev. 0.8
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Please note the new datasheet Rev. 0.8 available from the DRS web site. It fixes the label of pin #76, which was AGND but is actualy AVDD. The
input IN8+ is located at pin #20 and not at pin #19 as described in the old table 2. |
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Mon Feb 23 09:24:24 2009, Stefan Ritt, Rise-time measurements
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Many applications using the DRS4 need to measure fast rising signals, like for PMTs or MCPs. This short note shows the minimal rise-times which can be
measured with different input signal conditioning.
Evaluation Board
The evaluation board contains four passive transformers ADT1-1WT from Mini-Circuits to convert the single-ended input |
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Mon Apr 27 15:09:49 2009, Stefan Ritt, Amplitude and Timing calibration for DRS4 Evaluation Board
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This is a quick notification to all users of the current DRS4 evaluation board.
As you all know, the DRS4 chip needs some calibration for each individual cell which corrects the offset and the non-equidistant width in time.
While the first evaluation boards have been shipped without this calibration, the current version of the software implements a full amplitude and timing |
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Tue Apr 28 11:44:07 2009, Stefan Ritt, Simple example application to read a DRS evaluation board
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Several people asked for s simple application to guide them in writing their own application to read out a DRS board. Such an application has been added
in software revions 2.1.1 and is attached to this message. This example program drs_exam.cpp written
in C++ does the following necessary steps to access a DRS board: |
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Wed Apr 29 07:57:33 2009, Stefan Ritt, Simple example application to read a DRS evaluation board
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Stefan Ritt wrote:
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Wed Jun 10 12:46:43 2009, Stefan Ritt, Input range switch added in Version 2.1.3
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A new software verison for the DRS4 Evaluation Board has been has been released. Version 2.1.3 adds a switch for the input range of the DRS4 board.
Once can choose between -0.5V...0.5V and 0V...1V:
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Tue Jul 7 16:39:57 2009, Stefan Ritt, Power up problem and remedy
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Maybe some of you have experienced that the DRS4 chip can get pretty hot after power up. After it's initialized the first time, the power consumption
goes back to normal. I finally found the cause of this problem and have a remedy. Here is the new paragraph from the updated data sheet:
During power-up, care has to be taken that the DENABLE and DWRITE signals are low. If not, the domino wave can get started before the power |
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Thu Jul 9 09:11:03 2009, Stefan Ritt, Current problems with drs_exam.cpp
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The current version of the DRS readout example program drs_exam.cpp has two problems:
The sampling frequency cannot be changed, it will always stay in the region around 5 GSPS
The waveform obtained by GetWave
is rotated such that the first DRS cell corresponds to the first array bin
Both problems have been fixed and the fix will be contained |