Slow response LV7.0 and waveform charts

I have noticed a couple of issues with a waveform chart (when actually plotting a waveform).
1. Sometimes when I right-click on the chart to format a axes it may take up to 5 minutes to display the window with the chart format controls. During this time task manager says the application is not responding.
2. When plotting anything with size (I am trying to plot 5 minutes of data at 512 samples/sec) the program slows to a crawl. If I plot a double data (take the Y data from the waveform) it works great. Why is there so much overhead with a waveform chart? Anyway to fix this?
3. Unrelated to a waveform chart but related to item 1. Sometimes when I try to save my VI (~470 kb) it goes into limbo and may take minutes
. Again the task manager says it is "not responding". This seems to be a theme with LV 7.0. Has anyone else run into this problem?

> 1. Sometimes when I right-click on the chart to format a axes it may
> take up to 5 minutes to display the window with the chart format
> controls. During this time task manager says the application is not
> responding.
>
> 2. When plotting anything with size (I am trying to plot 5 minutes of
> data at 512 samples/sec) the program slows to a crawl. If I plot a
> double data (take the Y data from the waveform) it works great. Why
> is there so much overhead with a waveform chart? Anyway to fix this?
>
> 3. Unrelated to a waveform chart but related to item 1. Sometimes
> when I try to save my VI (~470 kb) it goes into limbo and may take
> minutes. Again the task manager says it is "not responding". This
> seems to be a theme with LV 7.0. Has
anyone else run into this
> problem?
Without looking at the waveform chart, it is hard to say. Things like
autoscale will slow teh chart down a bit as it then needs to traverse
more data looking for min/max. And when the scales do need to change a
bit, all the data needs to be replotted, not just the new stuff.
Other things that slow down a chart are to make its background
transparent, and to make it overlapped. Finally, full screen updates on
a big monitor mean lots of data needs to be moved around to draw lines
and rectangles, and that either comes down to the CPU or video card.
If you have more questions, or a VI to look at, post again.
Greg McKaskle

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     CLOSE shuttle_cur;
    commit;
END;Creating these collections from the initial collection is taking way too long. The page is rendered after about 22 seconds (when tier collection has 2 rows) and 10 minutes worst case (when the tier collection has 56 rows).
Thank you in advance for any advice you may have.

Try to instrument/profile your code by putting timing statements after each operation. This way you can tell which parts are taking the most time and address them.

Using Waveform Chart, inconsistent results when setting X range and delta X properties

I have isolated my problem to a simple vi consisting of only a waveform chart (attached). I am using LV 5.1.1. I have used an attribute node to set x minimum to 0, x maximum to 10, delta x to be entered by the user, and have turned autoscaling off.
When I plot 2 random points, x maximum is inconsistent, and doesn't stay at 10 when the vi is run several times in a row. Specifically, the first time the vi is run (after delta x is changed), x maximum changes. Then, the second time it is run, the max typically goes back to 10. However, when run several times in a row, x max will fluctuate. Specifically, I tried entering a delta x of 8. Mostly, the min is 0, max is 10,
and the line between the 2 random points plots from 0 to 8 along the x axis (good). However, every once in a while, the x max will go to 8.
This behavior is very strange, and will not allow me to program my actual application correctly until I fully understand what is happening. I would assume since Waveform Chart has these attributes to set, I can still using the Waveform Chart, and don't have to completely restructure my program to use another display.
Attachments:
deltaX2.vi ‏28 KB

That is the expected behavior, it is only that you don't assign the properties in the right order. If you set the XScale.Multipler before min and max all is how you expect it. When you set the multiplier, min and max are automatically changed to reflect the scale changes thus overwriting your previous settings.
LabVIEW, C'est LabVIEW

Waveform chart, plot and Dynamics Data and double data

Hello everyone !
I would like to get separate plots on the same waveform chart.
Actually, I am simulating 4 signals (but in reality, it would be signal from sensors) and I would like to get 4 plots.
In the end, I get 3 plots and no 4 plots.
It is very strange... Yet, I have selected 'Stack plots' and '4 plots shown'.
Actually, I can see the last data has been merged with the first one.
How can I fix that ?
Thank you !
Solved!
Go to Solution.
Attachments:
test5.vi ‏105 KB

I'm not sure how you got into this state but try going into the chart properties (right click front panel chart and click Properties from menu) and under the appearance tab, unclick "stack plots", unclick "Show digital displays(s), hit "OK", then go into properties again and reselect those two boxes and hit okay. It should correct the problem.
All statements are my opinion and worth every cent you paid for them.
Tom Whitaker, CLD
"Give every man thy ear but few thy voice."
Polonius in Hamlet.

Waveform chart slow to read samples AIs when sending AOs

Hi all,
I am using labview to sample AI signals and send AO signals sampling at 4k with 400 samples to read... The AOs are triggered using buttons on the frontal (E-stim or M-Stim).. When the E-stim button is pushed it will generate a square-wave signal with the freq and pulse characteristics as selected on frontal panel (default is 1 pulse at 50Hz)... These are pulses are used to control a muscle stimulator... So the idea is to be able to send whatever signal I want and have the stimulator deliver that same stimulus to the muscle (e.g. 10 pulses at 50Hz, or 5 pulses at 100Hz, etc etc).. To check the timing of this, I connected the AO to the "trigger in" on the stimulator and the "trigger out" on the stimulator to an AI channel... The pulses are coming through from the stimulator as expected...
However, when I send the AO pulses labview seems to "freeze" or "suspend" until all output pulses are sent... This is very apparent with a high number of pulses (e.g. 10 pulses at 50Hz)... That is, the waveform chart freezes/stops scrolling until all AO signals are sent, then the chart updates all the pulses in one hit and continuous displaying data; rathe than have each pulse displayed individually...Why concern is that AI during the AO phase may be losted ot not sampled properly...
Can anyone provide me with an explanation for this behaviour? I am using a LV2010SP1 and a USB-6218 BNC multifuction DAQ.
Thanks!
Jack
Attachments:
TMS2.vi ‏304 KB
TMS2.vi ‏304 KB

Hello Jack,
Reviewed the code.
Remember The way labview executes code, Labview executes code by flow of information meaning that it is going to wait untill the neccesary items are ready before executing the next part of the code.
For example If we want to make a simple add function for "x" and "y" labview is going to wait untill both inputs are ready for operation before operating and outputing "z" as a result.
It does it the same way everytime. I took the time and rearranged the code so we can understand it better, The execution happens from left to right, from top to bottom.
If we refer to the image, the arrows show us the flow of information of the VI, The DAQ assitant, the filtering of the signal and the Triggering is done before you actually output data through device1 analog output.
The code is expected to work that way cause it waits untill done acquiring with the DAQ asistant to start generating an output.
I can think of different options,
-You can modify this VI so that the output takes place regardless of the input data
-Having two different vis where you can set the read and write at different rates, using a functional global variable.
-Using a producer/consumer architecture.
This is an example that I think might be useful.
Using Producer/Consumer Architecture for DAQmx Read and Write to File
Hope this was helpful,
Luis Martinez.
Applications Engineer.
National Instruments.
Attachments:
Flow.JPG ‏146 KB

Operating a Waveform Chart Backwards and Forwards

I want to acquire data to a waveform chart. I want to be able to reverse the direction of my acquisition so as to overwrite the data that I have just acquired when needed and then go back forward - and so on. Does anybody know how I might be able to accomplish this or know of an example that may already do this? Thanks

You can't do that with a waveform chart but you can do it with a waveform graph. See attached example.
Attachments:
temp.vi ‏69 KB

Slow response LV7.0 and waveform charts

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