How can I change the X-axis increment in a waveformgraph

[Innovative]

The X-axis always increments by 1, but I am acquiring one point of data every 100 ms. So my chart moves 10 times fater that the real time. How can I set my x-axis to increment 0.1 every time I add data to my Waveformgraph in VB net?

The X-axis collection is not showing any property to change that.

I have a continuous data acquisition giving me timed data at 100 ms rate.

[Ed W]

Thank you for posting to the NI forums.  You can set the update increment of the WaveformGraph plot function by using the overloaded function as follows:

PlotYAppendMultiple( ByVal yData As Double(,),

   ByVal orientation As DataOrientation,  

   ByVal increment As Double )

I did this in the VB.NET example program, "ContAcqVoltageSamples_IntClk", by adding the following line to the dataToDataTable function.

WaveformGraph1.PlotYAppendMultiple(sourceArray, NationalInstruments.UI.DataOrientation.DataInRows, 0.1)

The increment will be set to 1 / (sampling frequency), so in your case, it will be set to 0.1.  This function is documented in the NI-DAQmx .NET Framework 2.0 Help.

I hope this helps.  Post back if you have any further questions.

Ed W.

Applications Engineer

National Instruments

Message Edited by Ed W on 05-04-2007 10:36 AM