How do i take a wave form, subtract the dc component and then see the result in a waveform graph?

[bspec]

I have an incomming cluster of data in a signal and i can see that on graphs, and see the averaged dc component on graphs, but when i try to subrtact the two it gives me an error message. if i try to convert the origional signal to a different data type and then subract the dc component it works, but it does not appear on a waveform graph. please help

[Jonnie_5]

You need to wire dT value to Avg DC-RMS averaging time node.  This value needs to match the dT of the data (or 1/rate), otherwise the two data types will not have matching dT's and cannot be worked with together.

LV 8 example attached (I changed to DAQ assist properties to Dev1, so you'll need to put it back to use it for your HW).

Editted to add - you don't need to convert the data if you properly set the Avg DC-RMS polymorphic selector (righ click the Subvi) to Averaged 1 Channel instead of automatic.

Message Edited by Jonnie 5 on 07-31-2006 03:32 PM