Read data using DAQmxReadBinaryI16

[moonlotus]

I'm using DAQmxReadBinaryI16 to read 8 channels data & save to file.

I modify the ContAcq-IntClk-EveryNSamplesEvent.proj, by changing

DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,nSamples,10.0,DAQmx_Val_GroupByScanNumber,data,nSamples*numChannels,&numRead,NULL));

to 

DAQmxErrChk (DAQmxReadBinaryI16(taskHandle,nSamples,10.0,DAQmx_Val_GroupByChannel,databuf,nSamples*numChannels,&numRead,NULL));

To scan 8 channels data, I set

DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai7:0","",DAQmx_Val_Cfg_Default,min,max,DAQmx_Val_Volts,NULL));

Samples per Channel = 5000

Sample rate = 5000

I run the scanning for hours & save all 8 channels data (in short) everysecond.

I found data of 1 channel looks like this after 1 hour scanning. 

First graph is plotting data from Channel 1, 2, 3, with same input.

Second graph is plotting data from Channel 2.

part of the data (in short & in double)

    chan 1      chan 2     chan 3        chan1           chan2          chan3 <-- after scalling using ScaleCoef

-162	-161	-161	0.073428	0.073757	0.073757
-159	-161	-160	0.074415	0.073757	0.074086
-159	-160	-159	0.074415	0.074086	0.074415
-159	-159	-159	0.074415	0.074415	0.074415
-158	-159	-157	0.074744	0.074415	0.075073
-172	-27	-164	0.070138	0.117849	0.07277
-161	-162	-158	0.073757	0.073428	0.074744
-170	-329	-164	0.070796	0.018478	0.07277
-185	-224	-174	0.06586	0.053027	0.06948
-184	-155	-185	0.066189	0.075731	0.06586
-205	-191	-193	0.059279	0.063886	0.063228