DRS4 Forum
  DRS4 Discussion Forum, Page 44 of 44  Not logged in ELOG logo
New entries since:Thu Jan 1 01:00:00 1970
    Reply  Thu Mar 31 20:38:05 2016, Abaz Kryemadhi, Trigger on the And of a positive and negative signal 

Thanks, that looks just fine.

Stefan Ritt wrote:

Here is one (SI 100): https://www.picoquant.com/products/category/accessories/adapters-splitters-cables-various-accessories-for-photon-counting-setups

Abaz Kryemadhi wrote:

Ok, thanks!  do you know an easy in-line inverter like mini-circuit or digikey?    Can also redesign the detector I gues to produce positive signals, just it might be easier if there was a simple inverter if you are aware of? thanks Abaz

Stefan Ritt wrote:

No. You have to use an inverter for one of your signals.

Stefan

Abaz Kryemadhi wrote:

I would like to be able to trigger in this fashon:  channel 0 > 0.1 and. channel 1< -0.1,  because I have a positive and a negative signal.  Can DRS4 (5) Eval board do this kind of trigger?

Thanks!

Abaz

 

 

 

 

    Reply  Fri Apr 1 01:30:40 2016, Abaz Kryemadhi, Trigger on the And of a positive and negative signal 

Hi Chris,

 I am looking at Sensl SiPMs as well,  can you send the part number from Coilcraft?

Thanks!

Abaz

Chris Thompson wrote:

I needed a fast pulse inverter in order to feed signals from the recent SensL SiPMs into a conventional CFD which only accepted negative signals. I got a very small ferite torridal transformer from Coilcraft and wired up to invert signals then inserted into in 50 ohm coax cable and it works fine. These things cost only a few cents each!

Abaz Kryemadhi wrote:

Thanks, that looks just fine.

Stefan Ritt wrote:

Here is one (SI 100): https://www.picoquant.com/products/category/accessories/adapters-splitters-cables-various-accessories-for-photon-counting-setups

Abaz Kryemadhi wrote:

Ok, thanks!  do you know an easy in-line inverter like mini-circuit or digikey?    Can also redesign the detector I gues to produce positive signals, just it might be easier if there was a simple inverter if you are aware of? thanks Abaz

Stefan Ritt wrote:

No. You have to use an inverter for one of your signals.

Stefan

Abaz Kryemadhi wrote:

I would like to be able to trigger in this fashon:  channel 0 > 0.1 and. channel 1< -0.1,  because I have a positive and a negative signal.  Can DRS4 (5) Eval board do this kind of trigger?

Thanks!

Abaz

 

 

 

 

 

 

    Reply  Sat Apr 2 17:22:34 2016, Abaz Kryemadhi, Trigger on the And of a positive and negative signal 

Thanks again,   this is very useful,  just another question did you put any other passive elements in the circuit for inverting the signal or just simply swaped the transformer connections? 

Chris Thompson wrote:

The coilcraft part number is: JA4220-ALB. Iordered two of them and they were sent as free samples. You might want to buy some slightly bigger ones. I found them so small it was very hard to solder the coax cable to the connectors. Since I got them, I managed to damage one as they are quite fragile! In the confirmation email I got there was some contact info which may be useful for you: "For help, contact Victoria Berner at 847-516-5551  vberner@coilcraft.com "  BTW every time I use this forum I'm told that my password is not valid. Each time I reset it according to the "Lost pasword preceedure. Then I can log on again. Its quite annoying.

Abaz Kryemadhi wrote:

Hi Chris,

 I am looking at Sensl SiPMs as well,  can you send the part number from Coilcraft?

Thanks!

Abaz

Chris Thompson wrote:

I needed a fast pulse inverter in order to feed signals from the recent SensL SiPMs into a conventional CFD which only accepted negative signals. I got a very small ferite torridal transformer from Coilcraft and wired up to invert signals then inserted into in 50 ohm coax cable and it works fine. These things cost only a few cents each!

Abaz Kryemadhi wrote:

Thanks, that looks just fine.

Stefan Ritt wrote:

Here is one (SI 100): https://www.picoquant.com/products/category/accessories/adapters-splitters-cables-various-accessories-for-photon-counting-setups

Abaz Kryemadhi wrote:

Ok, thanks!  do you know an easy in-line inverter like mini-circuit or digikey?    Can also redesign the detector I gues to produce positive signals, just it might be easier if there was a simple inverter if you are aware of? thanks Abaz

Stefan Ritt wrote:

No. You have to use an inverter for one of your signals.

Stefan

Abaz Kryemadhi wrote:

I would like to be able to trigger in this fashon:  channel 0 > 0.1 and. channel 1< -0.1,  because I have a positive and a negative signal.  Can DRS4 (5) Eval board do this kind of trigger?

Thanks!

Abaz

 

 

 

 

 

 

 

 

    Reply  Sun Apr 3 22:34:28 2016, Abaz Kryemadhi, Trigger on the And of a positive and negative signal 

Thanks, great!

Chris Thompson wrote:

No there are no other components. I put a photo of the inverter with its cables SMA and one end, BNC at the other. You can see it is very small. I glued the inverter to a piece of thin plywood, and fixed the cables to it before attempting to solder them to the pads on the ferite bead support

Abaz Kryemadhi wrote:

Thanks again,   this is very useful,  just another question did you put any other passive elements in the circuit for inverting the signal or just simply swaped the transformer connections? 

Chris Thompson wrote:

The coilcraft part number is: JA4220-ALB. Iordered two of them and they were sent as free samples. You might want to buy some slightly bigger ones. I found them so small it was very hard to solder the coax cable to the connectors. Since I got them, I managed to damage one as they are quite fragile! In the confirmation email I got there was some contact info which may be useful for you: "For help, contact Victoria Berner at 847-516-5551  vberner@coilcraft.com "  BTW every time I use this forum I'm told that my password is not valid. Each time I reset it according to the "Lost pasword preceedure. Then I can log on again. Its quite annoying.

Abaz Kryemadhi wrote:

Hi Chris,

 I am looking at Sensl SiPMs as well,  can you send the part number from Coilcraft?

Thanks!

Abaz

Chris Thompson wrote:

I needed a fast pulse inverter in order to feed signals from the recent SensL SiPMs into a conventional CFD which only accepted negative signals. I got a very small ferite torridal transformer from Coilcraft and wired up to invert signals then inserted into in 50 ohm coax cable and it works fine. These things cost only a few cents each!

Abaz Kryemadhi wrote:

Thanks, that looks just fine.

Stefan Ritt wrote:

Here is one (SI 100): https://www.picoquant.com/products/category/accessories/adapters-splitters-cables-various-accessories-for-photon-counting-setups

Abaz Kryemadhi wrote:

Ok, thanks!  do you know an easy in-line inverter like mini-circuit or digikey?    Can also redesign the detector I gues to produce positive signals, just it might be easier if there was a simple inverter if you are aware of? thanks Abaz

Stefan Ritt wrote:

No. You have to use an inverter for one of your signals.

Stefan

Abaz Kryemadhi wrote:

I would like to be able to trigger in this fashon:  channel 0 > 0.1 and. channel 1< -0.1,  because I have a positive and a negative signal.  Can DRS4 (5) Eval board do this kind of trigger?

Thanks!

Abaz

 

 

 

 

 

 

 

 

 

 

Entry  Wed Apr 27 20:04:12 2016, Abaz Kryemadhi, Best settings for time measurements 

I am studing some pulses that are about 200-300 ns wide and a rise time of few ns,    which settings would be best for coincidence time measurements?

In some preliminary work I found for 700 MegaS the time measurement is better without time calibration (in -0.05 to 1V) rather than with time calibration in -0.5 to 0.5,  my pulses are about 60 mV.   Is it expected that always with time calibration time accuracy would be better or depends?   

Also I use this code snippet to find time for channel 1 and the same idea for chan. 2.

// find peak in channel 1 above threshold
      for (i=0 ; i<1022 ; i++)
         if (waveform[0][i] < threshold1 && waveform[0][i+1] >= threshold1) {
            tt1 = (threshold1-waveform[0][i])/(waveform[0][i+1]-waveform[0][i])*(time[0][i+1]-time[0][i])+time[0][i];
            break;
         }

 

Thanks!

Abaz

Entry  Tue Jan 29 14:43:44 2019, Abaz Kryemadhi, ROOT Macro for data acquired with the newest software 

Hello,

Is there a root macro for decoding binary data acquired with the newest software for single board or multi-boards daisy chained?

Cheers,

Abaz

Entry  Fri Mar 8 19:35:11 2019, Abaz Kryemadhi, ROOT Macro for newest software read_binary.C

The older root macro did not work for me for data acquired with the newest software.

so for the newest software and multiple boards, I modified the read_binary.cpp into read_binary.C for those who like to use the root macro, see the attachment.  

 

Entry  Tue May 4 21:18:28 2021, Abaz Kryemadhi, recording only timestamp and amplitude and/or filesize maximum 

Hi,

I have been collecting some date using the DRS4 board at a trigger rate of 10-20 Hz,    I only need the timestamp and the amplitude, is there anyway to select only these two live as the data comes in to be stored. 

Alternatively,  What's the maximum file size or maximum number of events I can store in one binary file in linux. 

Thanks,

Best,

Abaz

ELOG V3.1.4-bcd7b50