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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