intensity graph 1/3 octave spectra: y-axis

[Peter_S]

Hi, I made a intensity graph from from 1/3 octave spectra (Range 50 Hz ... 10000 Hz) in 1-s-interval.
But I didn't found a solution to display the correct frequency values on the y-axis.
Any ideas?

Peter

[Philipp R.]

Hi Peter

Attached you'll find a version of your IntensityGraph.vi which I edited such that the y-axis is now set programmatically.
If you want to set custom markers on you y-axis refer to the other example in the attachment.

Best regards

Philipp Roessler

[Peter_S]

Hi Philip,
thank you.  But your solution is not correct.
The 1/3octave frequencies cannot represented by a series with constant frequency distance ( i.e. f(n+1)=f(n)+df )

They must computed by  f(n+1)=f(n)*2^(1/3)

In your example the 3. frequency is marked by 1000(Hz) but it is 80 (Hz).

I assume, that is not possible in Labview, because
- no log view of y-axis is possible
- the marker text can not set

the Property Marker Values[] (other example) has an other effect: It defines which markers are displayed, but it didn't set a new marker text.

Peter