different y scales for two waveforms from oscilloscope

[tian66]

Hello,

I am trying to write two waveform from oscilloscope. But one of the waveform has very small y scale.

Is there any wave to have two y-scale on the waveform graph indicator so that the small signal can have higer resolustion?

Thanks!

[GerdW · Accepted solution]

Hi tian,

search the LabVIEW help for "duplicate y scale"...

[pjr1121]

To display both, you could normalize them to a common scale but note that this does NOT increase resolution.  Noise is also amplified along with the signal.

[tian66]

Thanks, I got it.

But the resolution of the samll signal is still very low, any idea on that?

[pjr1121]

Signal resolution can be "improved" in a few ways.  1) average scans you collect on the oscilloscope to improve Signal to Noise ratio.  2) Perform software filtering of signal either in the oscilloscope or LabVIEW (filtering can diminish some higher frequency components in your signal). 3) design a hardware filter (RCL circuit) to "dump" high frequency signals to ground. 4) improve shielding of cables to reduce EM interference from room.

[tian66]

Hello,

I just want to the exactly waveforms showing on the oscilloscope. But now there is big difference between the waveform graph and the oscilloscope.

Thanks!