Temperature measurement on real time from NI 9217

[MAIPS]

Hi,

I want to measure the temperature of a RTD, Pt100.

I am trying to plot temperature (axis Y) against real time (axis X). At the moment i have this "PT100_monitoring_test" attached but I would like to insert an external clock or something like that to measure the temperatura on real time.

Is this possible?

Thanks!

[stockson]

Hi,

it seems to me you asked two separate questions:

"How can I make the measurements in real-time"

and

"How can I synchronise measurements with an external clock"

Which one is it?

[MAIPS]

Hi,

The firs one then.  "How can I make the measurements in real-time"

[stockson]

Well,

using cDAQ you will not get more "real-time" than what you have.

You can increase the sampling rate, reduce the number of samples you acquire and optimize the postprocessing so that new samples appear on the screen faster, but at this moment you are already getting real-time data.

What do you want to achieve?

[MAIPS]

I want to achieve more accuracy in the measure using 50 Hz and 10 samples for example to get 5 s/s, but then i want to plot  the temperature per second ("real time")

[MAIPS]

Can I synchronise measurements with an external clock to get what i explained before?

[Dennis_Knutson]

I can't look at your VI from my phone but there is no need to synchronize anything. When you specify the internal clock, you get very precise timing between samples and with a waveform data type returned by a DAQmx Read, you get a start time that a graph our chat can use. The start time is as accurate as the pc's clock and the x axis will be equally accurate. If you are using continuous acquisition mode, no data is lost and the plot should be exactly what you want.