The digital relationship of scanRate and sampleRate
Hello:
I'm using PCI-6024E DAQ board and labwindowscvi 5.0.1 to do some work.I failed to calculate the digital relationship of "sampleRate and scanRate" --- two parameters in the function "scan_op" of multichannels sample.Because when I set channelsnumber to 2(sample two AI channels),the scanRate to 500 scans per second and sampleRate to 800(400 samples per channel per second),I find sampling failed.When I change sampleRate to 1000(500 samples per channel per second) or 2000(1000 samples per channel per second),then sampling successed.So I think scanRate,sampleRate and channelsnumber must satisfy an digital relationship.But I failed to find it.If you know,please tell me,thanks.
Hello;
A value of 0 for the Scan Rate means there is no delay between scans and the effective scanRate is sampleRate / numChans.
When scanRate is not 0, scanRate must allow a minimum delay between the last channel of the scan and the first channel of the next scan. This delay must be at least 11 ?s on the AT-MIO-16X and 6 ?s on the AT-MIO-16F-5 and AT-MIO-64F-5. For E Series devices, this delay corresponds to the speed of the board. For example, 1 ?s for an E-1 board, 2 ?s for an E-2 board, and so on.
Hope this helps.
Filipe
Applications Engineer
National Instruments
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Go to Solution.Hello Jordan, thank you for your reply.
I am sorry but I can not see or run your example, I don't use LabView, I use Visual C++ for developing.
Here is the code for generating the pulse train:
GeneratePulseTrain(unsigned long ulCount1, unsigned long ulCount2)
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nStatus = DAQmxCreateTask("",&m_taskHandle);
nStatus = DAQmxCreateCOPulseChanTicks (m_taskHandle, "Dev4/count5", "", NULL, DAQmx_Val_Low, 0.0, ulCount1,ulCount2);
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nStatus = DAQmxSetTrigAttribute (m_taskHandle, DAQmx_DigEdge_ArmStartTrig_Src,"Dev4/PFI17" );
//set the internal timebase
nStatus = DAQmxSetCOCtrTimebaseSrc(m_taskHandle,"Dev4/count5","20MHzTimeBase" );
nStatus = DAQmxStartTask(m_taskHandle);
return nStatus;
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