The simple answer is that the result will be logarithmic – double the noise and you add 6 dB. In practice it probably isn't and neither will the on-site result when compared to your office measurements unless all conditions are identical.
We measure the audio noise (mainly from fans) from our products in a studio environment. Noise is directional and over the length of a product noise from one end has little effect on the noise measurement from the other end. Studio finish absorbs much of the noise but it is not acoustically dead. Now take the product into a metal lined room and, due to reflections, the measurement levels increase. Not much help I'm afraid but hope it gives food for thought. Neil Helsby ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
