Set waveform chart size to value 1000

Is there any possibility to set the size of waveform chart buffer to value >1000 in LabVIEW?
Message Edited by Konigusko on 05-03-2006 09:40 AM

Hello Konigusko,
you've got to right-click on the chart and choose "Chart History Length", then this little Dialog box appears.
Dave
Message Edited by daveTW on 05-03-2006 05:21 PM
Greets, Dave
Attachments:
Image1.png ‏8 KB

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Waveform Chart Y-T Values

I have a waveform chart plotting Voltage values against time. I have to store both the values into a Spreadsheet file. I am able to store the values on Y axis (vOLTAGE), but not the time values. How cal i do so?

One way is to build a waveform data type with Build Waveform function, add t0 and dt info, and use the Export Waveforms to Spreadsheet function. The dt, (delta time) should be readily available from the sampling rate of your data acquisition. You could also create an array of time values, append this array to your Y array for a 2D array and use the 2D input of Write to Spreadsheet file. There is a function in LabVIEW called WDT Get Waveform Time Array that shows how to create an array of time values.

How to set waveform chart to start data since beginning of run

Solved!
Go to Solution.
Attachments:
TCs.vi ‏106 KB

You need to check the update mode of your chart.
Strip Chart—Shows running data continuously scrolling from left to right across the chart with old data on the left and new data on the right. A strip chart is similar to a paper tape strip chart recorder. Strip Chart is the default update mode.
Scope Chart—Shows one item of data, such as a pulse or wave, scrolling partway across the chart from left to right. For each new value, the chart plots the value to the right of the last value. When the plot reaches the right border of the plotting area, LabVIEW erases the plot and begins plotting again from the left border. The retracing display of a scope chart is similar to an oscilloscope.
Sweep Chart—Works similarly to a scope chart except it shows the old data on the right and the new data on the left separated by a vertical line. LabVIEW does not erase the plot in a sweep chart when the plot reaches the right border of the plotting area. A sweep chart is similar to an EKG display.
From the help menu:
The waveform chart maintains a history of data, or buffer, from previous updates. Right-click the chart and select Chart History Length from the shortcut menu to configure the buffer. The default chart history length for a waveform chart is 1,024 data points. The frequency at which you send data to the chart determines how often the chart redraws.
Attachments:
resp2.jpg ‏36 KB

Setting Pie Chart Data Label Values Location Reverts to Default

After hitting OK the values return to the Side of Frame:

hi Richard,
that's pretty annoying...i too am dealing with the charting engine changing things. here's how to get around this...at least it worked in my cr 2013 version...
get out of Chart Options, right click on the Chart Expert and then go to the Options tab. now deselect any of the Data Points options and deselect Auto-Arrange.
now go back to Chart Options and redo the Data Labels selections you did in your screen shot.
-jamie

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

How to set maximum number of data points displayed on waveform chart?

I have a waveform chart set to x-autoscale, but after about 1000 data points, it begins to scroll again. How can I display all of the data points being collected, say 2000 points?

Right click on the chart and select Chart History Length. Enter the value that you need. The maximum is 2147483647 points.

How do i set the time frame of a waveform chart programmatically to be a 30 sec window or a 24 hour window

i'm using LV7.0 and what i need to do is to be able to set the time frame or range of a waveform chart programmatically before i start taking and plotting data. sometimes this window needs to be 30s wide and sometimes it needs to be 24 hrs wide. (in the first reference, i need the chart to fill up with 30s of historical data then the whole chart scrolls with each new data point). the data acquisition records data at a rate of once per second. i've tried to use the chart properties of XScale.offset, XScale.Range.Minimum and XScale.Range.Maximum but no matter what i do the time-stamp on the x-axis is always "00:00:00 PM" and "MM/DD/YYYY" even though values are seen being plotted on the right side of the chart as expected.
Attachments:
BX0265 ShelfLife DAQmx.vi ‏120 KB

Okay, there seems to be some confusion here -- the X axis values are of type double, but they can be represented in the HH:MMS MMD:YYYY format if you want in which case it interprets the floating point as the number of seconds since 6pm Dec 31, 1903.
You can programmatically set this value using the XScale.Minimum and XScale.Maximum properties, but note that if you wire a waveform to the chart after setting these values the t0 parameter will override what you set using the property node for XScale.Minimum. If instead you leave the t0 parameter empty you can use the XScale.Offset property and wire the same value in that you wire to XScale.Minimum. Changing the amount you add to XScale.Minmum to obtain what you wire into XScale.Maximum will determine the time window size.
Doug M
Applications Engineer
National Instruments
For those unfamiliar with NBC's The Office, my icon is NOT a picture of me

Waveform Chart - How to set X scale time.

I have a Waveform chart (v6.1) and I want it to display 30 seconds of data. What is the correlation between the Time History buffer and the Time inputed on the X-scale. The X-scale format is set to Relative Time. I set the initial time to 0:00. The input data is coming in at 20 samples/sec also. How do I set up the chart to show only 30 sec of data.

You can turn Auto scale off and set the left value to 0 and right value to 0:30.
A second method is to set the chart history length to 600 (20 samples per second * 30 seconds). Setting the chart history length can only be done at design time.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

Size of waveform chart window changes during remapping in SIT

Hi All,
I am using SIT 3.0.3 with LabVIEW 8.2.1. For had been facing a problem where each time I start the host VI the control & indicators would change their ranges. Especially the waveform charts used to change a lot for example the plotting area inside the chart would move a lot to the left making the scale invisible. Which makes it very difficult to understand the signal. Then I would the following KB article which solved a part of the problem.
http://digital.ni.com/public.nsf/allkb/234E19202757CFE8862572AE005559A2
But even after modifying the labview.ini file as mentioned in the KB still the waveform chart changes each time I remap the mappings using Connection manager and the I have to manually make all the adjustments again. Is there a way that I can avoid the automatic readjustment of the indicators and keep size, range shape etc intact.
Thanks and Regards,
Vicku.

Is the chart itself set to autoscale? Right-click on each of the axis and see if autoscaling is checked.
Mike...
Message Edited by mikeporter on 08-25-2007 08:58 AM
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
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Svg charts - size and default value

is there any way to make svg chart size smaller? i want to fit 6 graphs onto a page and even with the 350x315 setting, they are still too big
also, when i have a query like this:
select null, c.nodes, count (*)
from customers c, country_region_mapping m
where system_status='Production'
and c.country = m.country
and decode(:P4_REGION, '%', 1, m.region, 1, 0)=1
and decode(:P4_COUNTRY, '%', 1, m.country, 1, 0) =1
and decode(:P4_INDUSTRY, '%', 1, c.industry, 1, 0) =1
group by nodes
the page initially comes up empty. in other words, the charts have no data.
is there anyway to default to all

i'm currently checking on your question about the chart sizes, but the second part of your question sounds easy enough. it looks like your query will return all the rows "from customers c, country_region_mapping m where system_status='Production' and c.country = m.country" when the default values of :P4_REGION, :P4_COUNTRY, and :P4_INDUSTRY are '%'. if that's how you're going about things, you can simply set your defaults for these items to the percent sign in those items' respective definition screens. this way, even before your items get a session state value, they'll be assigned their default "%" values and your query will return rows.
i'll get back to you soonish re the svg chart sizes,
raj

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
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Attachments:
Wform_demo.bmp ‏427 KB

How to display value in waveform chart

dear sir
i am using labview 7.0 with dsc module for scada.
now i want to display the difference between two tags value in waveform chart. Also i want to display that difference value on y axis and system date and time on x axis continously. Also if there will change in that tag value then there should be reflection of that value on wavwform chart with system time. Really i am in trouble. please help me.
falgandha mohire

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.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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

Average value for waveform chart

Hello everyone.
Can i make a time interval, where i can measure average value for a waveform chart ?
for example fom 0:30 to 0:45
I have uploadet my VI
Thanks in advance
Oesen
Best regards
Oesen
Solved!
Go to Solution.
Attachments:
Trykmaaling.vi ‏83 KB

Oesen,
When you are displaying data on a chart, the newest data is appears at the right of the previous data. When the chart history buffer is full (default length = 1024), adding a new point deletes the oldest point. Visually it appears that the data slides to the left as new data is added to the right end.
My question relates to how the user would "tell" the program what data to average. In the image you posted you marked a segment of the data to be averaged. Suppose the user marks point "A" as the beginning of the segment. While the user is deciding where to put mark "B" additional data is acquired and point "A" disappears because it is beyond the history length. What does the program do in such a case? A slight variation is the situation where both "A" and "B" have been marked but some of the data is deleted from the history before the averaging or other processing has begun.
Lynn

Multiple values in stacked waveform chart...how to?

I am using a single waveform chart which is staked showing 3 Y-axis value on single X-axis platform.....more clearly I have bundled 3 values and connected to single waveform chart......Now, I want to add one more variable to each staked Y-axis....such that my each staked Y-axis have two variable....so that 6 y-axis variable in 3 staked plot(2 in each) having single platform of x-axis in single waveform chart.......
how to do that?

There are 2 vis that do this. Attach is my chart.
Attachments:
Chart_Ini_Elnik-II.vi ‏24 KB
Chart_Time-Init_No-Hist.vi ‏20 KB
chart.png ‏92 KB

Set waveform chart size to value 1000

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