Sound Vibration 2010 - Power in Band is incorrect

[깨굴]

Hi.

Sound Vibration 2010 

Power in Band.vi  is incorrect

Signal 100Hz, Amp. 1.414

Unit Convesion -> Magnitude, rms, linear 

correct , Power in Band  =  1   but 1.33?

Sound Vibration 2009 correct   Power in Band = 1

thank you.

[dsb@NI]

Confirmed - this is a bug in the shipping 2010 VI (LabVIEW 2010\vi.lib\addons\_NISVFA\_Spectrum Processing\SVFA Power in Band (1 Ch).vi).

A necessary check is not performed to verify that spectrum type = power, so the conversion to power is skipped.

This means that the VI will return an incorrect result when the input spectrum is scaled such that:

spectrum type = Magnitude

peak units = rms

scale = Linear

spectral density? = False

This scaling information can be inferred from the configuration of the frequency analysis VIs and confirmed by placing a custom probe on the spectrum info wire. The custom probe does ship with SV 2010.

This issue is now documented in CAR 253595. This is a high-priority issue that will be fixed in the next version of the toolkit as well as closing the hole in the automated test suite. In the mean time, please use the attached VI which has been modified to perform the additional necessary check.

Thank you for reporting this issue and for using the forums.