Test and Measurement Forum

power spectral density

Forum for discussing PicoScope (version 5)

power spectral density

Postby Jason » Sun Oct 01, 2006 6:22 pm


I need to convert a broadband noise spectrum from the dB as defined in your software into V^2/Hz.

How do i do this?


Postby Michael » Mon Oct 02, 2006 10:24 am


You will need to change the spectrum screen options.

Go to the settings menu and choose options. Now select Y axis and change from dB to volts RMS.

Best regards,
Michael - Tech Support
Pico Technology
Web Support Forum
Advanced User
Advanced User
Posts: 656
Joined: Thu Jul 07, 2005 12:41 pm
Location: St Neots, Cambridgeshire

power spectral density

Postby Gordon Hopkinson » Wed Mar 14, 2007 9:41 am


I have the same question about converting power spectral density from Db to V per root Hertz

I can see (I think) how to convert from Db to V (using your definition of reference voltage) - or changing the display to V as you say - but I'm wondering abot the frequency scale - is it really per root Hertz or is it per sample (in which case the unit would change with frequency range and number of samples)

To be honest, if it is a power spectral density then the software should give it in Db (or V) per something (I think ?)
Gordon Hopkinson
Posts: 1
Joined: Wed Mar 14, 2007 9:27 am
Location: Sevenoaks

Return to PicoScope 5

Who is online

Users browsing this forum: No registered users and 1 guest