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". |
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 |
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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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. |
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 |
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 |
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 |
Sat Apr 15 03:48:31 2017, Strahinja Lukic, Wave rotation during transfer from the board?
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I don't know if this question is already documented elsewhere.
I am developing a DAQ code for the DRS evaluation board, v4 for a test beam experiment. I link parts of the existing DRS code as a library.
To understand the effect of various flags used in calls to the functions DRSBoard::GetTime() and DRSBoard::GetWave(), I performed several tests |
Thu Apr 20 06:30:13 2017, Strahinja Lukic, Wave rotation during transfer from the board?
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Thanks.
Strahinja
Stefan |
Wed Jan 20 12:14:49 2021, Taegyu Lee, drs4 persistence
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Dear all,
I have a question about the function that drs4 can perform.
Is there any function in drs4 that is analogous to that of "persistence display" in oscilloscope?? (accumulating pulses) |
Fri Feb 24 17:34:28 2017, Tarik Zengin, Passing parameters to drscl
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Hi everyone,
I wonder if there is a way to pass parameters to drscl. What I specifically want to do is calling drscl from a shell script and read/save some
data. I want to schedule a measurement. Therefore I need to call drscl from the command line using some parameters. |
Tue Jan 25 14:15:00 2022, Thomas M., Regarding measuring for a set time
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Hello,
I'm working on a project wherein we're looking at photomultipliers. We've already acquired a DRS4 evaluation board with the intent
of using it to gather our data. |
Tue Jan 25 14:44:49 2022, Thomas M., Regarding measuring for a set time
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Yes, you've got it exactly right. Thank you, that helps a lot!
Thomas
Stefan |
Fri Feb 26 17:05:26 2021, Tom Schneider, Trouble getting PLL to lock
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Hello,
I am working on a custom PCB design with the DRS4 chip, and I can't get the PLL to lock. I'm feeding CLKIN with a 1MHz CMOS clock
(REFCLK- tied to VDD/2), and I'm using the same loop filter as the eval board. I see from the datasheet that the PLL is enabled by default, |
Fri Feb 26 18:33:52 2021, Tom Schneider, Trouble getting PLL to lock
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Stefan,
Thanks for responding so quickly. Yes I have my clock source going to REFCLK+ (CLKIN is the signal name on my schematic). BIAS is
0.7V exactly, /RESET is high, A0-A3 are 0x0000, and the loop filter has a 4.7nF cap to GND with a 130ohm resistor + 1uF cap in parallel, just like the |
Fri Feb 26 21:24:39 2021, Tom Schneider, Trouble getting PLL to lock
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Probe capacitance makes that tricky - if I put my probe on DSPEED, I see that it starts at approx. 2.5V then gradually decreases until it hits 0V.
DTAP decreases from 3MHz to 0 during this time.
I'll try to get something together to show you. |