How do I save timestamps for each sample?

[minamijian]

Hi 

I use the module of NI-9234 to measure the signal of accelerometer. I am using the code that "ContAccelSamp_IntClk_AnlgStart" for daq sample code. Now,i want to data add the timestamps for each sample. How do i use the function or example to solve problem?

Nan

[wellyhuang]

Hi Nan,

You may record the timestamp before plotting your data.

Say you are modifying the C# example codes, you can simply add another line of code to record the timestamp right after/before the:

        data = analogInReader.EndReadWaveform(ar);

 same function in VB code can be found at:

        dataToDataTable(data, dataTable)

[minamijian]

Hi wellyhuang

Thank your reply!!

I have another a question.How do i change arbitrarily the sample/channel ?

I used the example code:ContAcqAccelSamp_IntClk_AnalogStart.2010

Jan

[wellyhuang]

Hi Jan,

You may try to find the function which is in "DAQmx Configure Code" part in the main function: DAQmxCreateAIAccelChan

Maybe by adding a prompt for inputting the channel name, then pass the parameter to the function (e.g., scanf or getchar, etc.)

DAQmxErrChk (DAQmxCreateAIAccelChan(taskHandle,"Dev1/ai0","",DAQmx_Val_PseudoDiff,-100.0,100.0,DAQmx_Val_AccelUnit_g,50,DAQmx_Val_mVoltsPerG,DAQmx_Val_Internal,0.004,NULL));

Welly

[wellyhuang]

Hi Jan,

Does that meet your requirement?

BTW, since it's a follow-up question, maybe you could create another discussing thread to address this question; thus, if that works for you, you may close this discussion; and if it's not, you may go ahead and create another discussion for this.

Thanks,

Welly