TECHNET Archives

June 2005

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Seth Goodman <[log in to unmask]>
Reply To:
Date:
Fri, 10 Jun 2005 18:41:20 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (41 lines)
> 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
-----------------------------------------------------

ATOM RSS1 RSS2