Waveform Chart - How to set X scale time.

[ObeJuan]

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.

[waldemar.hersacher]

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

[ObeJuan]

I tried the suggestion, however the time the data scrolls is more like 47 sec. We have a similar challenge on another vi when trying to show only 60sec of data on a waveform graph. It looks like we'll settle for something that provides at least 30sec of data.

[Fantester]

Make a property node for the chart and set the Xscale.Minumum = 0 and the Xscale.Maximum = 30.0. This should be 30 seconds.