Problems with timing of analog input PCI-6111

I'm reading the analog input of a PCI-6111, who receives a square signal of 1 KHz with a cycle of 50%.  I put the sampling frequency to 1 MHz and wait until the data points are 1 usec outside.  When I check the signals received, it appears that the duration of each period of the square wave is 1.22ms instead of the expected 1.0 ms.

The following is a snippet of what I tried:

int NUM_SAMP = 10000;

DAQmxCreateAIVoltageChan (mTaskHandle,

"(/Dev1/AI0","",DAQmx_Val_Cfg_Default,-10.,10.,DAQmx_Val_Volts,null); "



Can you tell me what I am doing wrong?

Hello SNL_NB_1167,

A good place to watch code you know works would be the finder of the example.  "" "" Open the finder example and navigate to hardware input & output "DAQmx" analog measures ' tension ' ContAcq - IntClk.prj

Run this code and see if you get the same results.  If so, then we would know that it's a hardware problem and not a problem with the programming.  If you see the correct behavior, then you have code that you can shape your out of.  I hope this helps.

Tags: NI Hardware

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