Is it best to set waveform graph scale properties before or after sending new data to the graph?

Hi I'm wondering when is the best time to update waveform graph scale properties.
I am sampling data every 15 minutes for 192 samples, i.e. 48 hours. I want to plot these samples with the x scale in absolute time mode so that x scale maximum is the current time and x scale minimum is x max minus 48 hours (172800 seconds). I also want the intermediate scale markers to be 6 hours apart and to be multiples of whole 6 hours. e.g. at 06:00, 12:00, 18:00. This works OK using property nodes but sometimes the intermediate markers are on the 6 hour multiples and sometimes they are at 6 hours after the min scale marker. e.g. 09:15, 15:15, 21:15. Is there a way of guaranteeing that the intermediate markers will be on the 6 hour multiples?
Thanks,
Neville
Solved!
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Hi Bryan,
Thanks for your reply. I have discovered that I can achieve what I want by using an XY graph instead of a waveform graph. I want X max to be the current time and X min the be 48 hours earlier with intermediate scale markers on multiple of 6 hours. The XY graph in the attached VI does exactly that but I can't get the waveform graph to behave as I would like. Is there a way of getting the waveform graph to behave as I would like?
Thanks,
Neville
Attachments:
waveform graph x axis scale.vi ‏16 KB

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Position vs MeasuredDistance.PNG ‏43 KB
Position vs. PseudoPosition.PNG ‏37 KB

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Solved!
Go to Solution.
Attachments:
display block diagram.JPG ‏43 KB
210pm.JPG ‏53 KB
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I probably don't need to see the other VI's.
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DaveT,
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-cb

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

I want to plot a waveform chart where I have a constant slope(defined by me) and new data is plotted over the chart with the defined slope already in the background.

I want my chart to have a constant slope already plotted before it continues to start plotting the real time data.. so that I can compare my new data point to point with the ideal slope that i already have in the background
Solved!
Go to Solution.

raza51 wrote:
Hi,
Thanks for help.. But this would work when i have one array and a constant "slope". What if I want to print 2 arrays of data.. means if there is an array of data instead of constant "slope"...
Since your graph is refreshed every time you go through the loop anyway, just set up the constant/reference array before the loop and feed it into the graph. That way you'll also have a full X-axis (and a Y-axis which at least includes all the reference data) for the graph already set up.
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