Hi all
I am pretty new to using DAQ card .The card I am using is 6062-E.I need to increase the sampling rate .Currently in the code I am using it is 100k.I need to increase it to probably 500k as this is the max sampling rate of my card.What parameters I need to change in the code.Please have a look at my code. Thanks.Currently the no of sample points in one period are 5000.
#include "nidaqex.h"
#include <stdio.h>
/*
* Main:
*/
void main(void)
{
/*
* Local Variable Declarations:
*/
i16 iStatus = 0;
i16 iRetVal = 0;
i16 iDevice = 1;
i16 iChan0 = 0; // using channel 0 for laser signal
i16 iChan8 = 8; // using channel 8 for delfection angle signal
i16 iStartTrig = 0;
i16 iExtConv = 1;
i16 iGain = 1;
u32 ulCount = 10000; // sample 5000 pts each channel
f64 dGainAdjust = 1.0;
f64 dOffset = 0.0;
f64 dScanRate = 100000.0;
i16 iSampTB = 0;
u16 uSampInt = 0;
i16 iScanTB = 0;
u16 uScanInt = 0;
i16 iUnits = 0;
static i16 piBuffer[2][5000] = {0};
static f64 pdVoltBuffer[2][5000] = {0.0};
static i16 piChanVect[2] = {0, 8};
static i16 piGainVect[2] = {1,1};
i16 iInputMode = 1;
i16 iInputRange = 10;
i16 polarityChan0 = 0;
i16 polarityChan8 = 0;
i16 driveAIS = 1;
i16 iNumMUXBrds = 0;
i16 iNumChans = 2;
i16 iDAQstopped = 0;
u32 ulRetrieved = 0;
i16 iIgnoreWarning = 0;
i16 iYieldON = 1;
u32 i=0,j=0,k=0;
FILE *fp;
/* Setup Channel 0 */
iStatus = AI_Configure(iDevice, iChan0, iInputMode,iInputRange, polarityChan0,driveAIS);
iRetVal = NIDAQErrorHandler(iStatus, "AI_Configure",iIgnoreWarning);
/* Setup Channel 8 */
iStatus = AI_Configure(iDevice, iChan8, iInputMode, iInputRange, polarityChan8, driveAIS);
iRetVal = NIDAQErrorHandler(iStatus, "AI_Configure", iIgnoreWarning);
/* Setup for external conversions into PFI2 with iExtConv = 1. */
iStatus = Select_Signal(iDevice, ND_IN_CONVERT, ND_PFI_2,
ND_LOW_TO_HIGH);
iRetVal = NIDAQErrorHandler(iStatus, "Select_Signal",
iIgnoreWarning);
iStatus = DAQ_Config(iDevice, iStartTrig, iExtConv);
iRetVal = NIDAQErrorHandler(iStatus, "DAQ_Config",
iIgnoreWarning);
/* Instead of calling DAQ_Rate, let iSampTB be 0. */
/* Acquire data from a single channel */
/*************************************************************
iStatus = DAQ_Start(iDevice, iChan, iGain, piBuffer, ulCount,
iSampTB, uSampInt);
iRetVal = NIDAQErrorHandler(iStatus, "DAQ_Start", iIgnoreWarning);
*****************************************************************/
iStatus = DAQ_Rate(dScanRate, iUnits, &iScanTB, &uScanInt);
iStatus = SCAN_Setup(iDevice, iNumChans, piChanVect, piGainVect);
iRetVal = NIDAQErrorHandler(iStatus, "SCAN_Setup",
iIgnoreWarning);
iStatus = SCAN_Start(iDevice, &piBuffer[0][0], ulCount, iSampTB, uSampInt, iScanTB, uScanInt);
printf(" Apply your external conversion clock signal to PFI2.\n");
while ((iDAQstopped != 1) && (iStatus == 0)) {
/* Loop until all acquisition is complete. HINT: You can be
doing other foreground tasks during this time. */
iStatus = DAQ_Check(iDevice, &iDAQstopped, &ulRetrieved);
iRetVal = NIDAQYield(iYieldON);
}
iRetVal = NIDAQErrorHandler(iStatus, "DAQ_Check", iIgnoreWarning);
iStatus = SCAN_Demux(&piBuffer[0][0], ulCount, iNumChans, iNumMUXBrds);
iRetVal = NIDAQErrorHandler(iStatus, "SCAN_Demux",
iIgnoreWarning);
iStatus = DAQ_VScale(iDevice, iChan0, iGain, dGainAdjust, dOffset,
ulCount, &piBuffer[0][0], &pdVoltBuffer[0][0]);
iRetVal = NIDAQErrorHandler(iStatus, "DAQ_VScale",
iIgnoreWarning);
/* CLEANUP - Don't check for errors on purpose. */
/* Set sample timing back to initial state. */
iStatus = DAQ_Config(iDevice, 0, 0);
/* Set PFI line back to initial state. */
iStatus = Select_Signal(iDevice, ND_IN_CONVERT, ND_INTERNAL_TIMER,
ND_LOW_TO_HIGH);
DAQ_Clear(iDevice);
/* Plot acquired data */
iRetVal = NIDAQPlotWaveform(pdVoltBuffer, ulCount, WFM_DATA_F64);
printf(" The data is available in 'pdVoltBuffer'.\n");
fp = fopen("datacalibrate12.dat", "w");
if(fp==NULL)
{
printf("Can't open data.dat!");
exit(1);
}
for(i=0; i<(ulCount/2);i++)
{
fprintf(fp,"%f\t%f\n",pdVoltBuffer[0][i],pdVoltBuffer[1][i]);
}
fclose(fp);
printf("file has been written");
}
/* End of program */
