Experts in Vibration – we design your test and measurement solutions

 

Contact Us

Under privacy policy you will find our information according to Art. 13 GDPR about data protection in connection with our contact form.

 Subscribe to m+p Newsletter

Converting between Sine Amplitude and PSD

If you are doing sine-on-random mixed mode testing, it is often useful to be able to convert between PSD and sine amplitude and vice versa.

The following simple formulae can be used:

To convert sine peak to PSD

and to convert PSD to sine peak

where

= sine wave peak amplitude
= sine wave measured PSD
= frequency resolution of the FFT in Hz

As an example consider you are generating a 2.5 g sine tone and want to check its amplitude on a measurement channel that is displaying a PSD result. The frequency range for the random is set to 3200 Hz with 800 line resolution, hence the frequency resolution is

The expected PSD amplitude for a 2.5 g sine tone would be

Note:

To reduce errors in signal processing and thus increase accuracy, we recommend applying an RMS method as implemented in our m+p VibControl software.

<