×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Nois level inside Anechoic Chamber

Nois level inside Anechoic Chamber

Nois level inside Anechoic Chamber

(OP)
Dear sirs:

If an anechoic chamber was for sound isolation, inside noise level should be below 20 decibels.

Is the same requirement mandatory or advisable for RF anechoic chambers?

What is the noise level usually recommended?

Thanks

schola

 

RE: Nois level inside Anechoic Chamber

First, I don't think of an anechoic chamber as being designed for "sound isolation". Instead think of it as minimizing reflected sound (which I admit could be seen as isolating the sound source from the reflected sound). Semi-anechoic chambers are designed to replicate the ideal free field site. A fully anechoic chamber is the same except in all 6 directions.

Second, you can't say that the ambient sound level in any anechoic chamber must be below 20dB. The minimum level required depends on the minimum level you wish to measure and what you level of certainty you want/need. It may also be dependent on some industry spec. If you are trying to measure a jet engine at 140dB does it really matter if the background is 20 or 30dB?

So in regard to you question:
- Do you need to meet some industry spec?
- Depends on the minimum level you wish to measure and what level of certainty you want/need. (which also drives the measurement devices)
- budget (as always!)

ISZ

RE: Nois level inside Anechoic Chamber

20 dBA would be a ridiculous target if the cooling air and other services were operating at full capacity, for example, for a car. 50 dBA would be acceptable.

 

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources