> From: TechNet [mailto:[log in to unmask]]On Behalf Of Jason > Sent: Friday, June 10, 2005 5:30 PM > To: [log in to unmask] > Subject: [TN] data conversion > > > Does anyone know how to convert > (0.02 g2/Hz) to G's? Sounds like this is a power spectral density from an accelerometer. As with any power spectral density, the total quantity (acceleration, in this case) is the result of integrating over the frequency range of interest. The quantity you then have is equivalent to total power of the electrical signal from the accelerometer but expressed in units of g-squared instead of Watts. To get the scalar acceleration, you would then take the square root. Be careful that the spectrum is really a power spectrum, that is, the units are g2/Hz, V2/Hz or I2/Hz (all these 2's should be superscripts meaning squared). If it is a voltage or current spectral density, the units would be V/sqrt(Hz), A/sqrt(Hz) or g/sqrt(Hz). In that case, it would be necessary to first square the values in the spectral plot, then integrate over the frequency range of interest and finally take the square root. Regards, Seth Goodman Goodman Associates, LLC tel 608.833.9933 fax 608.833.9966 --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------