How to implement cursor in waveform chart?

Hi,
i have used visa tools for making .dat file of data values...i used waveform chart to graphically represent data of that file.i want to implement cursor in that can you help me out how to do it.
Regards,
vijtin
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Hi vijtin,
replace your chart with a graph to enable a cursor legend...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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How to achieve this in waveform-chart?

I do use waveform chart in which 3 waveforms are stacked. My x-axis represent current time and y axis is a some quantity...Please look at the picture attached....is it possible to do this in waveform chart? Whenever mouse/cursor is on waveform it should display y-axis value corresponding to that point.......

Hi HS,
do you use 2 different logins?
If you would enable/show the cursor palette of the graph you would actually see those values instantly...
When you want to calc with them you can use the properties of the cursor to get the x- and y-value! No calculation of graph size and so on needed...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to display value in waveform chart

dear sir
i am using labview 7.0 with dsc module for scada.
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Nadim,
Why would an XY graph be preferable to using a Waveform Chart where the "t0" is the time of the measurement?
I don't get it.
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Hi everybody,
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Solved!
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thankyou nyc,
I am seeing the demos.llb but nothing is mentioned about using cursors or markers.
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How do I update a waveform chart with multiple plots one point at a time?

Hi,
I am updating multiple plots one point at a time. That is, every time I update the chart I have a value for one of the plots. If I put in a cluster with NaN for each of the charts except the one with the data I can only get individual points on the chart. I would rather have them connected.
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Are the points within a given plot equally spaced in time? If so, perhaps you need to maintain your own history of the data and used a waveform graph rewriting the history data to the graph each time. If the points are unequally spaced, then you will need to do it as an XY graph.

How do i clear a waveform chart after i press stop?

I attached what I have so far.
I'm taking readings from 3 thermocouples simultaniously.
I then graph and log the data in real time.
I would like it if after i press stop, the graph resets. Then when i press start, the graph starts from the beginning.
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Attachments:
Test1.vi ‏143 KB

On the False side of your measure case, use a Property Node for each chart. Property should be History Data, set it to write, and wire an empty array to it. This will clear the graph. I'd also use a shift register wired to a boolean so that you don't keep writing to the properties. Set the boolean to true on the True side of your measure case.
Message Edited by Mythilt on 05-27-2008 12:39 PM
Jon D
Certified LabVIEW Developer.
Attachments:
Test1[1]d.png ‏17 KB

How to set real time waveform chart

I would like to record voltage signal from built-in microphone. My block diagram is attached.
I would to like record 1second data every 10min and then take an average of that 1s data so that I have 1 data point about every 10min. The time of the origin of the chart must be kept at start date and time all the time and the program need to run until I stop it.
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Hello
answers are in blue
phx wrote:
Freelance_LV, Thank you very much for your editing, I am testing the program. I have some questions.
1. Why can't I just using continuously running to run my program to make to run continuously? it is a good practice to use a while loop and run the code, than use the run continuously button. my understanding is that the run continuously button will cause the code to run at the highest possible processor speed and will use up the entire load on the processor. by using a while loop and placing a small delay, we can ensure that the cpu is not loaded by our program. But, i hope our seniors could provide the correct explanation to it.
2. From your diagram, what I realise is that in 3600s, the signal of time sends data to "elapsed time" every 0.1s until the elapesd time is the same as target time so the the "True/False" Loop" can run. My question is, once the the "True/False loop" start runnig, how long does it run? 1second? Or is my understanding about the flow wrong? check the attached code. i made some additions, to answers your question.
3. The minimum sample rate of the "acquire sound" is set to 11025Hz which is also the sample length of the "Mean". Does it mean that the mean it takes is the mean of the amplitude of latest 11025 samples? would suggest you use Mean vi than the Mean Pt to Pt vi. logically, the mean vi should read the input array of data, calculate the mean of the values. there is no 'latest' here. the mean vi gives the mean value of the array at its input. the acquire sound vi will read the data from the microphone at the sample rate mentioned. you said the min sample rate if 11025 Hz. but your code shows 8000 Hz as input!
4. Why isn't the x-axis the current time if I just put the diagram inside the True/False Loop out to a new VI? you will need to set the start time of the X-axis using the property node X-axis range minimum value. Else, the chart/graph will take the standard start time as 1/1/1981 and 0.00 time + or _ the GMT zone.
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Attachments:
1_edit.vi ‏68 KB

How to clear waveform chart

How i can clear a waveform chart with dynamic datas? The normal procedure with handover a empty array doesnt work.
Uwe Augst
Muehlbauer AG
Germany

Hi,
here´s a small example with a property node (Historie), everytime you restart that VI, first the chart is cleaned up and than refilled again.
Hope this helps,
AlexMessage Edited by Alex R on 05-03-2005 11:18 AM
Attachments:
Clear Waveform-Chart.vi ‏21 KB

Clearing a waveform chart

Hello!
Can someone explain how to re-set a waveform chart to initialize to 0
at the start of the run of the VI.
I notice one example where a zero array is input...
but this looks like overkill.
Is there an easier way.
Thanks,
Adrian

Adrian,
It's really simple. Just create a property node or reference to the chart, and select the history. Then, just wire a constant (easiest to create a constant from the node itself) which is empty, and voila - an initialized chart.
Good luck, and let us know how you do.

Waveform Chart in array

HI
How i can put a waveform chart in a array?
is this posibel ?
Attachments:
Waveform Chart in array.vi ‏8 KB

But you can create an array of clusters containing waveform graphs, right? If you want to create a modular front panel of graphs etc.
Regards,
Even
Certified LabVIEW Associate Developer
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Topro AS
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How to save X and Y vaue from a Waveform Chart

Hello Everyone!
I'm implementing an adquisition systems that send data to a waveform Chart through VISA. All run properly, but I would like to save the data adquired to an excel file. I saw examples to how to save it, but only save the Y value.
I would like getting the X and Y values in 2 columns different in the excel file.
¿Is it possible?
¿Can someone tell me how I can do it?
Thanks for your feedbacks!
Solved!
Go to Solution.

I meant uploading the actual VI, not a picture of it. You need to fix your code.
You should not be initializing the serial port in each iteration of the loop. Initialize outside, read in the loop, and close when the loop is done.
Why do you have 2 VISA resource controls? Are you talking to 2 different devices?
The event structure serves no purpose in your code. If you are trying to enable/disable the file writing, use a case structure that's controlled by a simple front panel switch.
You should "remember" the path that the Write to Spreadsheet File uses. Otherwise you will be asked for the filename each and every time you try to save. You can do this using a simple Feedback Node:
Since you are reading the value periodically, just use one of the Get Date/Time functions. You can use the Get Date/Time String to get a formatted string. Then you can format your value as a string, and build your array using those 2 values. Or, you can use the Get Date/Time in Seconds to get a numerical value. Be aware that LabVIEW's starting time is 12:00 a.m., Friday, January 1, 1904, Universal Time [01-01-1904 00:00:00], which is different from Excel.
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Example_VI_BD.png ‏1 KB

How can i print out the waveform chart?

hello everybody,
how can i print out the "waveform chart". can i do it just push the button. ( example; stop button is stop the program etc..)
i checked the NI examples but i can't understand. i'm new to the Labview.
pls help me.
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regards from turkey...
Message Edited by hknmkt on 05-29-2008 04:15 AM
Attachments:
29.05.2008_11.vi ‏37 KB

hi jim,
i tried the program but it's not running. When i run the program, it's print out without run the program
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hakan
Attachments:
error8.JPG ‏8 KB

How do I add a time stamp to the moving "Major Grid Lines" of a Waveform Chart?

Hello
I am using LV 8.5.1
I am using a Waveform Chart and I have turned on the "Major Grid LInes" using the properties tab of my waveform chart. (properties-->scale->grid lines)
When the code executes, I want to attach a time stamp to each moving yellow grid line.
So as the grid lines move from right to left, there is an associated time stamp for each.
Can someone help!
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J
Solved!
Go to Solution.
Attachments:
how do I add time to the yellow grid lines.vi ‏16 KB

hova2010,
If you right click on your graph and go to X Scale >> Style >> and then choose one of the 3 styles on the far left you shoul see timestamps for those grid lines.
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How can I change the color of plot in a waveform chart and graph?

There are 4 plots in a waveform chart, from plot0 to plot3, and I want to chang the color of plots dynamicly up to my needs when the VI is running.
For example, as show in the picture, i want to set the plot0 as RED, and plot1 is BLUE, plot2 is YELLOW, plot3 is GRAY.
If there is only one plot, i can change it's color, however when there are more than one plot, it fail.
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Thanks
Attachments:
waveform.JPG ‏61 KB

Hello MilkyStone,
first you have to set the active plot, then change its color (or other properties). All that is done using property nodes.
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to take the print out of the entire data from the waveform chart

i am using cont acq to spreadsheet file.vi to acquire data from a number of channels. this vi also plots the acquired data on the waveform chart. i want to take the print out of the entire data. how can i do it ?
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There are a number of different ways of achieving your goal. Depending on which version of LabVIEW you have and which development environment, the Report Generation Toolkit is a very powerful tool. Attached is an example that prints the acquired data without the use of additional toolkits.
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Attachments:
DAQ_with_Print.llb ‏115 KB

How to implement cursor in waveform chart?

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