How do I create a Waveform Chart with scrollable time/data history?

[hova2010]

Hello All

I have a Waveform Chart that displays my data points as my test is running.

What I need to do is have the chart store the times associated with each plotted value.


Example 1: If the chart is running, I'd like to use the scrollbar/ graph pallete to rewind the chart and tell me what time/date in chart history did each data point occur.

Example 2: If I found a defective point in an over the weekend test, I would like to scroll back thru the chart data to that point and see the time/ date it occured


Can anyone help me with this Waveform Chart scenario? Im using LV 8.5.1


thanks!!!

J

[Rob_F1]

Use a property node to set the X-Scale format and minimum at the start of your test.View Context help to get the format description, 7 is time and date.

[hova2010]

yes Ive tried this...but it doesnt work in my attachement...do you know why?

thanks

J

[hova2010]

yes Ive tried this...but it doesnt work in my attachement...do you know why? thanks J

[Rob_F1]

Your right, I didn't try it in a loop. That Sucks! I found an example, try this: in LV 8.5

Hope this helps.

[hova2010]

yep, tried the Real Time also.

Not really what I wanted....I just need some way to keep track of points and associated Time Stamps.

So when I scroll back thru the chart data, the Time Stamp appears visible to the user.

Any other way to do this?

J

[Dennis_Knutson]

How about looking in the shipping examples? Do a search for 'charts'. Run Real-Time Chart. The key is understanding what the offset and mulitplier mean in a chart or graph and what minimum and maximum should be used for.

edit - see that the shipping was posted. It works for me. The actual time of acquisition is written on the x axis.

Message Edited by Dennis Knutson on 10-09-2009 12:35 PM

[stevem181]

Hi J,

See if this does what you need.

steve

[stevem181]

This version generates it's own data.

steve

[Joseph_Loo]

Did you set the history length? If your chart displays 400 points and youset the history of 8000, you can scroll back in time roughly 20 x the length. If set the chart to collect a point every minute and set the history for 18000. This will keep a history of 30 hours.