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Entry  Tue Jun 19 06:42:23 2018, Phan Van Chuan, The data acquisition speed wavech0.png
    Reply  Tue Jun 19 10:05:50 2018, Stefan Ritt, The data acquisition speed 
    Reply  Tue Jun 19 12:54:51 2018, Phan Van Chuan, The data acquisition speed 
Message ID: 703     Entry time: Tue Jun 19 06:42:23 2018     Reply to this: 704   705
Author: Phan Van Chuan 
Subject: The data acquisition speed 

Dear Stefan,

We are using an DRS4 board V5.1 for building a metering system for the scintillator detector by a Labview program. The program was built based on the functions in DRS.cpp and it reads data from channel 0 very well (Fig 1). Now, I am having a problem with the data acquisition from DRS4 board. The data acquisition speed on this program is only about 30-50 Acq / s, while using the DRS Oscilloscope that of about 300-400 Acq / s.

When the program was installed with fDominoMode = 0 and fDominoActive = 0, the data acquisition speed was about 300-400 Acq / s. However, the waveform is inaccurate.

I do not know if I installed the wrong function! Can you show me how to solve this problem?

In the Labview program, functions (corresponding to functions in DRS.cpp) are called with the following parameters:

 

InitFPGA();

SetMultiBuffer(0);

fROFS = 1.6;              // differential input range -0.5V ... +0.5V

fRange = 0;

SetDAC(fDAC_ROFS_1, fROFS);

 fCommonMode = 0.8;        // 0.8V +- 0.5V inside NMOS range

SetDAC(fDAC_CALP, fCommonMode);

SetDAC(fDAC_CALN, fCommonMode);

SetDAC(fDAC_BIAS, 0.70);

/* set default number of channels per chip */

SetChannelConfig(0, fNumberOfReadoutChannels - 1, 8);

// set ADC clock phase

      fADCClkPhase = 0;

      fADCClkInvert = 0;

   // default settings

fMultiBuffer = 0;

   fNMultiBuffer = 0;

   fDominoMode = 1;

   fReadoutMode = 1;

   fReadPointer = 0;

   fTriggerEnable1 = 1;

   fTriggerEnable2 = 0;

   fTriggerSource = 0;

   fTriggerDelay = 0;

   fTriggerDelayNs = 0;

   fSyncDelay = 0;

   fNominalFrequency = 1;

   fDominoActive = 1;

// load calibration from EEPROM

ReadCalibration();

...

SetDominoMode(fDominoMode);

   SetReadoutMode(fReadoutMode);

   EnableTrigger(fTriggerEnable1, fTriggerEnable2);

   SetTriggerSource(fTriggerSource);

   SetTriggerDelayPercent(0);

   SetSyncDelay(fSyncDelay);

   SetDominoActive(fDominoActive);

   SetFrequency(fNominalFrequency, true);

   SetInputRange(fRange);

SelectClockSource(0); // FPGA clock

// disable calibration signals

   EnableAcal(0, 0);

   SetCalibTiming(0, 0);

   EnableTcal(0);

   // got to idle state

   Reinit();

 

////////

SetFrequency (1,false);

settranspmode (1);

setinputrange(0);

EnableTcal (0,-,-);

EnableTrigger(1, 0);

SetTriggerSource(0);

SetTriggerLevel(0);

SetTriggerPolarity(false);

SetTriggerDelayNs(512);

 

// in loop of read data from DRS4:

 {

StartDomino();

while (b->IsBusy());

TransferWaves(0, 8);

GetTime(0, 0, b->GetTriggerCell(0), time_array[0]);

GetWave(0, 0, wave_array[0]);

}

 

Thank you very much!

Best Regards,

Chuan

 

 

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