My waveform chart is suppose to be with respect to time but I've noticed it is plotted with respect to the number of times through my VI

I was under the assumption that waveform charts in LabVIEW 6i atomaticly displayed wired data with respect to time in seconds. However, I noticed that my chart plots data with respect to the number of data points my VI has generated. Is there anyway to fix this so that the chart actually plots vs. time. I've attached VI. The CIN is to a Computerboards Inc, thermocouple. Any help would be appreciated.
Attachments:
tepTInScan.VI ‏73 KB

It appears that the chart is set to display relative time but since you don't have the acquisition in any kind of a loop, your relative time is pretty meaningless. You've got the dX of the chart set to be one, so yeah, at the beginning, the x scale numbers are going to be the same as the number of aquisitions until you've run it more than 60 times. At this point, you'll see the x scale show minutes and seconds. If you want absolute time for the x scale, look at the examples Real-Time Chart.vi or Variable-Time Chart XY.vi.

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Adobe Media Server pro 5 Scalabiltiy Requirements with respect to the number of clients connected

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Auto update waveform chart error

Hi all!
I have come across the problem when working on my VI. As you can see from the VI that I have attached, there is a waveform graph on the front panel for data acquisition. The value shown right now is from time, 00:00:00 to 00:05:00 (0-5minutes).
The problem that I am faced right now is, everytime when I hit the run button, LABVIEW seems to automatically change my time value to some sort of generic time. What I want to accomplish here is that, I want to acquire data on the waveform graph from time 0 to 5 minutes. Also, I would like to specify the increments myself. For example on the time scale (x-axis) from 0-5 minuntes, I would like a 30 seconds interval between them. How do I actually accomplish it?
I have tried absolute time format and changing my waveform chart to sweep chart.
Thanks for any help!
Jlam
Attachments:
PDaq- Modified_07-08-2010.vi ‏61 KB

The problem here is that Waveform Charts and Graphs always assume a constant delta time between data points. If you are absolutely certain the data points are guaranteed to be sampled at consistent intervals, the Waveform Chart or Graph is a good fit for the data.
On the other hand, if data points are sampled at arbitrary time intervals, it will be necessary to use the XY graph, where different timestamps for each data sample determine the t-axis (time, horizontal axis).
The deal here is that your horizontal axis is N, Sample Number, not t, sample time. Your samples start at 0, and increment 1, 2, 3... Therefore, if you are taking 120S/sec, it will appear two minutes - 00:02:00 (HH:MMS) - have elapsed in the first second! One way to convert Sample Number to Time is by mulitplying that scale by the factor 1/120. To add a multiplier (or offset) to your scale, go to the properties of the Chart. Likewise, you can use a property node to programmatically set scaling factors on the scale.
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How to show two different plots with current system time and date on waveform chart

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How does your data look like? Do you graph waveform data types, dynamic data, or plain arrays/clustes? In the case of plain arrays, you need to set x0 to the absolute start time of your data, e.g. with a property node.
I you would attach your code (or an image) we could offer more specific advice. There are too many possibilities.
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I have written a LabVIEW project for 8510.
I have a problem with the waveform chart not updating the data incoming to it.
that is, Y axis does not update according to 8510 display format.
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Attachments:
Network_Analyzer_8510C_nazanin_5.lvproj ‏6 KB

Hi,
Do you want to change the label???
1. Just right clicl your graph
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Stiffness Control V1.vi ‏119 KB

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Problems with waveform chart

Hi guys,
here I am again with another issue... I just need your help to a small issue, the attached VI is my project...the problem i have is that my waveform chart only shows 0.065 seconds of data, i needed it to show the total time of the test...if possible, coordinated with the time selected by the user in "time to test"...
Is it possible?
Can anyone please help me?
Best regards,
Jimmy
Attachments:
Ensaio de Rugosidade_01.vi ‏221 KB

Hi,
Right click your chart and select properties. In properties set the X axis scale minimum and maximum values as per your requirements. Select autoscale if you want it to be automatic. To set the X axis scale programmatically, select the property node X-axis->Range and wire the limits accordingly (in your case, you can wire it to the "time to test".
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Waveform Chart Update With Relative Time

Hey,
I have a question about how a waveform chart updates. I am running a test in the pictures attached it is only for 4 minutes and I read in a data value every 90 seconds. I was wondering why the waveform chart doesn't look like chart 2 (photoshop what I want) instead it looks like chart 1.
I pass to the waveform chart a double every 90 seconds or so. How can I make the chart behave like picture 2? Where it connects the data points with the time each data value is sent to the chart.
Attachments:
Chart1.png ‏26 KB
Chart2.png ‏10 KB

Actually if you look carefully at chart 1 it appears that it is connecting the dots. But the time scale is messed up. Can you post some example code?
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Problem with waveform chart

Hello friends.
I'm in learning lab view and have some questions.
I get a signal with an Analog to Digital converter (an Atmega 32) and send data to com port .
I convert my data to real value in voltage and time .
But i have problem with show wave form in different frequency .
By Increase of frequency , waveform chart can not draw my data Clearly.
What i do to show data in different frequency ?
Thanks .
Attachments:
t4.vi ‏13 KB

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When interfacing with hardware from others, we have to look fo rthe manufacuer of the hardware to provide enough support to get started.
So I suggest you contact whoever makes your device and get some examples from them.
Hopefully they have heard of LV and have drivers.
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Problem with Waveform Chart X scale

Hi guys.
I am new here and Labview, sorry for my english wrongs. I am from Brazil.
So, i try have an absolute time in x scale, from my waveform chart, but the VI don't execute this. I wish make like the picture in annex. It´s the only problem in my project.
I Use Labview 8.6 version.
Please help me
Icaro Kossmann
LabVIEW 8.6 Newbie.
Brazil
Attachments:
tela labview.png ‏46 KB

Kossmann wrote:
This is a print of block diagram with a close in waveform chart.
Your chart does not get any timing information, thus you need to set the dt manually or with a property node according to the update rate of your code (we cannot tell from the picture).
If you want absolute time, you also need to set the t0 according to the start time of the chart. Then you also need to select the desired time format of the axis.
(It really does not help to show us code pictures. I recommend you attach the actual VI.)
Kossmann wrote:
The datatype is 14 channel with single precision, and the format of the x-axis is absolute time, but, the VI don´t show it. And i wish to show divisions on each 5 min.
Instead of telling us what it does not show, tell us what is shows instead and what's wrong with it.
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Can my 600MHz P-3, 256MB Ram handle a data acquisition of more than 1kHz with waveform chart support?

please suggest tools for acquiring high speed 8 analog channel data.
can my 600MHz P-3, 256MB Ram handle a data acquisition of more than 1kHz with waveform chart support?

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I have performed data acquisition on a computer with lower specs than the one you described, at rates greater than 1 kHz. I don't quite understand the "waveform chart support" portion of your question, but if you are asking if it is possible to plot the acquired data on a Waveform Chart in LabVIEW, this should not be a problem.
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The problem is the forces are lower than the distance, so if I graph all in one is going to be a big mess or can I just play with each scale of each plot and put everything in one Y axis?

Wolfson wrote:
Hi, I have labview 8.5 and I would like to know if is possible to have one waveform chart with two Y axis, I have two signal from a force load cell and two signal from a LVDT, so I would like to graph in real time what is happening in the process having in one axis the forces and in the other axis distance, how can I do it?
The problem is the forces are lower than the distance, so if I graph all in one is going to be a big mess or can I just play with each scale of each plot and put everything in one Y axis?
1) Right click on the Y-axis and choose "duplicate scale". This will give you another Y-Axis.
2) Optionally right-click the new Y-axis and select "Swap sides" to move the new Y-axis to the other side of the graph.
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Recording 1 hour of waveform chart with 64 inputs?

I am using 64 inputs at 100Hz each and I'd like to visualise each of these inputs for at least 1hour.
I use 8 charts of 8 inputs each. I made several tests :
I put a big history lenght on the waveform chart--> the ram disk (512Mo) is not abble to store all the information.
When the chart history length is more than 10000 long, it doesn't work well.
When we put a small chart history lenght 1024, waves are deleted when we resize the window. The waveformchart can only record 1min of datas.
Is there a way to visualise one hour or more of acquisition at 100Hz with 64 inputs?
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Each time you acquire a new point, you put it in a waveform chart. That means that, each time, you make an array bigger and LV will give it a new memory allocation ... This will give a very slow process if you manipulate millions of points (this the case 3600*100*64 = around 23 040 000 of points).
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My waveform chart is suppose to be with respect to time but I've noticed it is plotted with respect to the number of times through my VI

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