Labview absolute time waveform chart to excel

Hi everyone, I have a bit confusing on absolute time waveform chart. My problem is when I want to export to excel, the data duplicate nearly 30 times for each second. My project is about collect temperature from serial port and plot it in waveform chart, and I want to view history data in excel.
Anyone can help to solve my question? I attached my vi here..
Thank you so much..
Attachments:
NEW FINAL1.vi ‏96 KB
snap.PNG ‏11 KB

You are getting such a large number of readings because your VI has no timing control in it, if you simply add in a delay somewhere of maybe migrate to an event structure with a timeout then you can control the number of readings that are taken per second.

Similar Messages

Export all data from my waveform chart to excel

Hello, my name is Chris. I am just learning to use LabView. Everything I have learned so far is through these boards. Which is a valuable tool for someone learning. The VI I am working on is to monitor current from a unit we are testing. I am able to monitor current and have it running in what I believe to be real time. As I said, this is the first one I have made. I am trying to export all the data from my Waveform Chart to a report. Everytime I try I get one instance and it measures 0. I don't know what I am doing wrong. Any help would be appreciated. Also, if you have any suggestions on the all around working of this I would appreciate that as well. Thank you in advance.
Attachments:
Lp Current Test.vi ‏83 KB

Hey Christophrt,
If you are trying to display the microseconds for a waveform chart in LabVIEW here is how you can do it:
Go to the Chart Properties>Display Format>X-Axis>Advanced editing mode>enter:
%<%I:%M:%S%6u>T as the format string and you will have the hours: minutes: and seconds to the microseconds.
If you are trying to display the exported data in microseconds in Excel, you will probably have to do some formatting changes in Excel to have that work.
Regards,
Tommy G.
Applications Engineer
National Instruments

Write data from waveform chart to excel

Hi,
I am trying to create a button that save de real time values recieved in a waveform chart. I don't know how to save it alls, because I don't know if is needed a buffer to save all or how can I do it.
It wil be faboulous if someone give me ideas!
Thanks so much for your support!
Solved!
Go to Solution.

Hi mlop,
You can go through the attached VI. You will get some idea of how to do it..
Regards,
Nitzz
(Give Kudos to good Answers and Mark it as a Solutoin if your problem is Solved)
Attachments:
Untitled 2.vi ‏9 KB

Waveform chart to excel

I need to put my waveform chart data into an excel graph?
does anyone know how this can be done?
please help,
Harold Timmis
GE Transportation
Harold Timmis
[email protected]
Orlando,Fl
*Kudos always welcome

here..
do this
Message Edited by krispiekream on 11-14-2008 01:58 PM
Best regards,
Krispiekream
Attachments:
excel1.PNG ‏19 KB
excelPlot.zip ‏215 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.
But I cannot set the date and time to be real time. How can I make it?
Thank you very much.
Attachments:
1.vi ‏41 KB

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.
Thank you very much!!
Attachments:
1_edit.vi ‏68 KB

How to update the absolute time value in waveform chart for labview 6i?

Hey there,
I'm developing a control system using labview 6i on win 2000 os.I'm receiving the sensor data every minute and i want to display the data on a waveform chart with absolute time scale on x-axes. I'm using the property nodes for the offset, multiplier and maximum values putting them outside the while loop and giving them input using get date/time in seconds function. the problem is that the time doesn't gets updated w/ refernce to the computer time and after a certain period the time shown on x-axes lags by several hours. any advise?

Posting an example ussually help us nail these types of issues fast.
I am therfore forced to guess.
Do you have your code written such that the scale operations occur before the loop?
The next thing I have to suspect (not being able to see your code) is if your dt is correct. If your dt is larger than what the chart is set for, then the time will fall behind.
I have included an image showing how the chart can be used to show multiple sample rate plots such that the t0 of the readings are used to control how the readings are displayed. This example uses waveform data types (I believe they were available back in 6i). It should serve as a guide to do what you want.
I suggest you start by recreating the demo and play with it until you have what
you will need in your app.
The beauty of this method is it lets you use the chart to plot signals acquired at different frequecies and plot them all together.
reply to this answer if you have questions,
Ben
Ben Rayner
Certified LabVIEW Developer
www.DSAutomation.com
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
Wform_demo.bmp ‏427 KB

Waveform chart X-Axis reverses itself when upper limit is edited in Absolute Time - problem may be linked to Timestamp Control?

I've seen this problem for some time now, and it still exists in the Silver toolset Waveform Chart in LV 2012. If the chart is in strip mode, and you edit the upper limit value to a point in the future, the X-Axis will invert (higher values/ later time to the left), to the limit of the Chart History length. This happens whether the chart is active (logging data on a compiled executable) or even when in design mode, though it's more consistent when there's data in the chart. It's not history length related as far as I can tell, as I set the length to 7 days of sampling @ 1-second intervals (605K), and it happens when I try to set the end time to an hour in the future with only a few minutes of data collected - suddenly the right Absolute Time becomes the time my last sample point was collected, while the left Absolute Time becomes nearly 7 days in the future (so neither end point is what I was setting it to).
It's nice that the chart gives the option of editing the limits, but as such, it's important that they work as you would expect them to.
Also - until this is addressed, is there a way to lock it against editing? Until a fix is made, my workaround is to put a transparent button over the range start & end points, and a transparent flat rectangle above all other mid-range points, and pop-up a data entry form with a Timestamp control to allow editing. Unfortunately, this doesn't work as I would expect, as typing "11 AM" in the Timestamp control over a prior value of say "10:05:34.232 AM" ends up becoming "11:05:34.232 AM" instead. ??? Another error - or is this by design? If it's by design, is there an option to make it behave as I would prefer (11 AM = 11:00:00.000 AM), as Excel behaves with timestamps? I can't help but suspect this may be linked to the chart axis issue.
Also - I just built a simplified chart modeled somewhat on my current project, and could not get this to recur. BUT... had the strangest thing happen: My sample data was generated using the Trig functions for Sine and Cosine, and at one point my waveforms distorted on the display, so I'm attaching that here plus the simplified chart project.
Last - my system is LV 2012 on Win7 Pro-x64.
Thanks!
Erik
Attachments:
Chart data distorted.png ‏45 KB
Waveform Chart Flaw.zip ‏17 KB

I am not so sure that this is a bug, and I have not been able to reproduce this behavior that you are describing.
But you can lock it from editing by right-clicking on the graph and go to Properties>>Appearance>>Enabled State --> Disabled
Also, word of advice for the future: You will get more replies from the community with shorter posts and keeping it to one question per post. Summarize what the issue is, and put the detailed documentation and instructions to reproduce in the actual VI.
Huntington W
National Instruments
Applications Engineer
***Don't forget to give Kudos and Accepted as Solution where it is deserved***

How to show two different plots with current system time and date on waveform chart

I am using one waveform chart to display the more than one value continiously. The data are comming properly but i am not getting my system (pc) time and date on x axis. It is showing default date and time (i.e.01/01/1904 5:30:45). Please give me suggestions to display the real time and date on x axis of waveform chart.

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.
LabVIEW Champion . Do more with less code and in less time .

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.

Waveform chart to looking like this excel format

hello,
i am using the DAQ assistant.
i configured it to have 9 channels of data.
can someone guy me into exporting the data to look like this excel file?
how can i take the data from the waveform chart and input it into the RAWDATA STRING so that it look like the format in the excel sheet?
thanks!
Attachments:
TCs.vi ‏108 KB
082714.001.csv ‏139 KB

No need to delete old posts. It may help someone in the future and if not, it will fall off the main pages and dwell forever in land that time forgot... Or the NSA will grab it.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

How do you set the size / bounds of a waveform chart at run time?

I have a plot area that I would like to fill with as many waveform charts as the user specifies (at run time). The "bounds" property is read only and I haven't noticed an additional "size" property for a waveform chart as there is for a button. Is there a way to set the size of a waveform chart at run time, and if not, why not? (Labview 6.1)

Look at it a little more carefully, I suspect that your assumption is only half wrong. The property does only resize the plot area--LV resizes the frame to fit the resized plot on it's own.
You'll need to bear this in mind when you're figuring-out what size to set the property to.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Waveform chart. Send data to Excel

I am monitoring the output voltage from a electronic circuit using LabView 7.1 and a DAQ card.
I have been able to view the output voltage using a Waveform Chart but i have been unsuccessful sending the data to a file. Only one data point gets saved each time.
I am using the "Write to Spreadsheet File .vi "
Could someone tell me what i am doing wrong?
Please see the program attached below.
Attachments:
Attempt 3.vi ‏26 KB

You can build a 1D array as your loop runs. Where your data exits the while loop, right click on the border and select 'Enable Index'.
If you want to save data continously, you need to move your 'Write to spreadsheet file' vi inside your while loop. As it is, only the last data point will be saved when you stop your loop.
You will also need to connect a control or constant to the file path input so that you do not get a file dialog every time your loop iterates. Further, connect a True constant to the 'append to file?' input so that you do not overwrite data.
Also, you may want to insert a wait period in your loop to allow other processes to run.Message Edited by DavidT on 04-27-2005 09:16 AM

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?
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Waveform chart time axis is not matching the waveform data

So here an interesting conundrum I hope you might be able to help me with...
My VI has waveform data sent to a chart, though the data is not being plotted against the current time. Rather, it is being plotted starting way back in the reference time (way back in 1903). I don't understand why this is happening. When I build the waveform, I use the "Get Date/Time in Seconds" function outside the while loop and feed that into my "Build Waveform" Function as the t0 value. My dt value is 0.05 (20 Hz) and then I feed in my array of data in the Y input. Any ideas why the chart is plotting this data over 100 years ago? Thanks!
Andrew

Hiii, Ronin
Here is your solution.
By default, waveform charts and graphs display the absolute time at time 0 as 7:00:00 PM, 12/31/1903 on a Windows based system. Property nodes can be used to get the correct absolute time to display on the x-axis of the waveform chart.
First, right click the chart on the front panel and select X Scale >> Formatting. Then set the format to Absolute Time.
Create a property node for the waveform chart by right-clicking on the chart on the block diagram and selecting Create >> Property Node. Expand the property node to display two properties. Select the Format property and the Offset property. The Format property is located under X-Scale >> Format and Precision >> Format, and the Offset property can be found under X-Scale >> Offset and Multiplier >> Offset. Right click on the property node and select Change All to Write.
For the Format property, the context help shows that there are multiple inputs to this property. Wire in a value of 7 to set the format to Time and Date.For the Offset property, first wire the output of the Get Data/Time in Seconds VI to the input of the To Double Precision Float VI. Then wire the output of the To Double Precision Float VI to the Offset property.
In addition, if you know the number of data points plotted to the chart per second, you can set the Multiplier property located under X-Scale >> Offset and Multiplier >> Multiplier. If there are x data points generated per second, wire in a value of 1/x to the Multiplier property. A simple example program "Chart with Timestamp" that demonstrates how to do that is attached.
Thanks,
Nishant
Attachments:
Chart with Timestamp.vi ‏36 KB

Definate absolute time chart

I am trying to make a chart of temperature values with absolute time. First, the timing seems to be a little off and second, I would like to display an hour of data and then have it write over itself so it is always displaying the last hour of data. It would be nice to be able to scroll through a day or two of data, but not neccessary. I have attached my code from Labview 2010. Could you please help me modify my code to do this? Thank you in advance for your help.
Solved!
Go to Solution.
Attachments:
Temp_Graph_Not_Working.vi ‏14 KB

Hi danjneff,
how do I make it clear the chart history each time I start the program?
Use the history property node.
This is explained in an example VI to be found in the example finder…
I am pretty new with LabVIEW so don't understand your answer to the x-axis question
Again: as you are new to labVIEW you should take all those FREE online courses offered by NI on their website!
Would it be easier for me to use a graph?
Easier: not really.
Getting better results: yes.
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Labview absolute time waveform chart to excel

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