Continously and waveform graph

Hi!
In my program Im recieving sampled data from hardware
via COM port.
If I want to display the data (voltage values) in
"realtime", continously, Is it possible to use
"waveform graph"? It seems to me that only "waveform chart" can be doing that. Can "waveform graph" only handle "finished" arrays(finished means "loop is done" and no more data to enter the array)?
The reason I ask this is that I want to have a correct timeaxle according to samplerate from hardware.
To be able to have correct time between the plots I am maybe forced to read data a certain time and when this time is reached the array is done and I can use the "waveform graph with bundle"?
Thanks Fredda

A waveform chart is used to append te data as it is acquired, the graph collects the data and then graphs it at the end. And yes you can collect your data and then output it to a graph when you are done sampling.
This link tells the differences in slightly more detail, hope this will help you out.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/95fee9f5b252507e862562ba00007657?OpenDocument

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Combine waveform chart and waveform graph

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plot_two_waveforms.vi ‏29 KB

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My signal is out put of current transformer which is 2v dc. I succesfully configure usb 1208fs with labview8.2. Now I want to plot my input signal on the waveform graph in frequency vs amplitude(db). Can any one guide me how can i plot my data?

Hi,
Could you strip the VISA stuff and re-post your VI so I could run it and see where is the difference coming from. A few observations though
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I am utilizing a waveform graph and I need to programatically manipulate multiple cursors based upon the movement of a primary cursor. I would like to use the event structure to avoid processor usesage.
My approach is to create an While Loop/event structure where it goes into a it when there is a "mouse down" on the waveform graph. Once in it, there is another While Loop/event structure that has two cases: Time Out (set to 25) and a "Mouse Up" on the waveform graph. In the Time Out case, the primary cursor is read and modifies the location of the secondary cursors. In the "Mouse Up" case, the primary cursor location is read, other cursors are manipulated, and the While Loop is exited.
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This is basically the method I typically used in LabVIEW 7.1 and below as described in this old post.
Of course you could upgrade to LabVIEW 8.0 and none of this is necessary! LabVIEW 8.0 has events for "Cursor Move".
Now you only need the "cursor move" and "stop" cases. Isn't that cool!
Message Edited by altenbach on 12-12-2005 07:05 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
LV8CursorMove.png ‏6 KB

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Attachments:
Measure and Record Six Voltages with Express1.vi ‏119 KB
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I attached here an example of Lorenz attractor for solving three diffrerential equations and displaying the results in xy graph and waveform graph.
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Hello Ahmad,
I have applied the same concept to your second graph in order to view the waveform chart plot point by point I used property nodes to clear the chart after every iteration of the while loop. Maybe this will give you more direction in your application. I would strongly recommend going through all the properties available for waveform graphs and charts. You can use property nodes like I did if there are programmatic changes you would like to make to the graph or chart during run time.
Vivek Nath
National Instruments
Applications Engineer
Machine Vision
Attachments:
reduction2-1.vi ‏51 KB

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You can start from here ...
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tester.vi ‏97 KB

Putting waveform graphs and 8bit images in the same window by Windraw

How to put waveform graphs and 8bit images in the same window by Windraw VI?

Use "Invoke Method: Get Image" to get a pic of your waveform graph/chart. Then combine this pic with your 8bit image using the IMAQ tools (IMAQ ImagetoImage). If you need an example send an e-mail again ...
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Control Waveform Graph - Set Lower Limit and Autoscale Upper Limit

In a waveform graph is their a way to set the lower graph Y limit at zero and then have it autoscale the maximum Y limit as a percentage (150% for example) of the maximum Y graph value ?
Direction to examples or a starting point to read up on would be great !
Thanks,
Joe
Ireland
Solved!
Go to Solution.

Turn off autoscale and set the max with a property node based on the array max of the data.
LabVIEW Champion . Do more with less code and in less time .

How to use offset and multiplier property in waveform graph?

hello,
i m using a waveform graph and wanted to update its x-axis scale depending on the multiplier value. Also how this
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Regards,
vijtin
Solved!
Go to Solution.

hi,
X0 is the offset and X is the multiplier. So the graph will start at a cetain offset and will aa to that the delta value times the multiplier.
e.g.
If you would have these normal X-values : 0 ; 1 ; 2 ; 3 ; 4 ; 5 and a multiplier of 2 and ofset of 5 you would get the result on the X-as = 5 ; 7 ; 9 ; 11 ; 13
Hope this helps
Kind regards,
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Have fun using LabVIEW... and if you like my answer, please pay me back in Kudo's
LabVIEW 5.1 - LabVIEW 2012

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Hi there,
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Hi there;
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I am taking temp readings with a 4 channel DAQ, sending them to a waveform graph and exporting the data to excel, how do I manipulate the graph to take a continuous reading as opposed to losing the previous GUI and how can I save the entire graph?
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Continously and waveform graph

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