Acquiring Continuous and Finite Data Simultaneously

[jhwimmer]

I have a program reading in temperature measurements from thermalcouples and I currently have my system set up to take a finite number of samples.  During the acqusition I am unable to see the data in the front panel and I would like to set up a way to watch a continuous waveform graph for my data while it is being sampled so I can watch for errors.  Is there a good way to go about doing this?

[Dennis_Knutson]

A graph will display each acquisition and then clear itself for the next. A chart will append the new acquisition to the old up to the history length that you set. After the history length of reached, old data is dropped.

I don't know which you are using and without seeing your code, it's impossible to say why you aren't seeing anything. Do you have a loop with the chart/graph inside of it?

[crossrulz]

Use a Chart instead of a graph.  That will allow you to keep a history and give you more time to spot your waveform.

[llebras]

Difference between Graphs and charts:

http://digital.ni.com/public.nsf/allkb/95FEE9F5B252507E862562BA00007657

[jhwimmer]

I guess I left some important things out.  Right now I have the finite samples going to a waveform graph.  I am sampling for 100 seconds at 1 hertz and during that time I can not watch the data.  Once the 100 seconds are up I can view the data but I would like to moniter the data while it is being collected.  Is there a way to have a continuous waveform graph of my data while it is taking the finte samples?

[Dennis_Knutson · Accepted solution]

You can't view data until it has been acquired. It is your programming of the acquisition that is at fault. If you want to see it sooner, change the number of samples or the sample rate. With a chart instead of a graph, you can simply change the number of samples and get a continuous display.

[crossrulz]

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@jhwimmer wrote:

I guess I left some important things out.  Right now I have the finite samples going to a waveform graph.  I am sampling for 100 seconds at 1 hertz and during that time I can not watch the data.  Once the 100 seconds are up I can view the data but I would like to moniter the data while it is being collected.  Is there a way to have a continuous waveform graph of my data while it is taking the finte samples?

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Yes.  It is called a CHART.  If you want, you can set the history length to just be 100.