jonnyGURU Forums
Home Site Search Reviews Articles Contest Links PSU FAQs  


Go Back   jonnyGURU Forums > Site and Forum Topics > Testing Methodology Discussion

Testing Methodology Discussion Questions and comments regarding the testing methodologies used on jonnyguru.com

Reply
 
Thread Tools Display Modes
  #21  
Old 03-30-2017
-The_Mask-'s Avatar
-The_Mask- -The_Mask- is online now
ssssssmokin'
 
Join Date: Jun 2010
Location: The Netherlands
Posts: 4,742
Thanks: 336
Thanked 1,355 Times in 885 Posts
Default

If you don't hear it, doesn't mean it isn't there of course.
Reply With Quote
  #22  
Old 03-30-2017
Orion's Avatar
Orion Orion is offline
Tinfoil Hat User
 
Join Date: Aug 2014
Posts: 880
Thanks: 285
Thanked 613 Times in 279 Posts
Default

Quote:
Originally Posted by crmaris View Post
all the rest equipment is in an another building and I just remote control the sound meter and the rest of the stuff.
So the load tester's cables (and other load equipment cables) will be routed from the other building and come into the anechoic chamber through some kind of hole in the wall, correct?
Reply With Quote
  #23  
Old 03-30-2017
crmaris's Avatar
crmaris crmaris is online now
Cybenetics CTE
 
Join Date: Jan 2010
Location: Greece
Posts: 1,495
Thanks: 150
Thanked 460 Times in 217 Posts
Default

The procedure is different, however I am afraid that I cannot reveal more about it.
Reply With Quote
  #24  
Old 03-30-2017
Internet Internet is offline
1kW User
 
Join Date: Oct 2016
Location: Brazil
Posts: 206
Thanks: 177
Thanked 74 Times in 36 Posts
Default

Quote:
Originally Posted by crmaris View Post
Once the door closes, you can only hear your thoughts in there Will post more pics of course once it is fully ready.
Are you sure? This video says you can hear more than your thoughts.
https://www.youtube.com/watch?v=mXVGIb3bzHI

Noob question: what's the practical difference of having those big edges on the foams? Asking because the pictures of anechoic chambers I'm seeing have big edges on the foams, but in yours the edges are much smaller.
Reply With Quote
  #25  
Old 03-30-2017
jonnyGURU's Avatar
jonnyGURU jonnyGURU is offline
Site Founder
 
Join Date: Oct 2006
Location: jonnyGURU forums, of course!
Posts: 14,893
Thanks: 475
Thanked 1,870 Times in 1,154 Posts
Default

Quote:
Originally Posted by Internet View Post
Noob question: what's the practical difference of having those big edges on the foams? Asking because the pictures of anechoic chambers I'm seeing have big edges on the foams, but in yours the edges are much smaller.
You mean like this one?

__________________
Rest in peace Mike Clements, aka "Yellowbeard"

Rest in peace Joerg Theissen, aka "GI Joe"
Reply With Quote
  #26  
Old 03-30-2017
Internet Internet is offline
1kW User
 
Join Date: Oct 2016
Location: Brazil
Posts: 206
Thanks: 177
Thanked 74 Times in 36 Posts
Default

Yes.

Wondering also if those things can compete against strong thunderclaps. Had one big storm here this morning, all the windows here were vibrating...
Reply With Quote
  #27  
Old 03-31-2017
crmaris's Avatar
crmaris crmaris is online now
Cybenetics CTE
 
Join Date: Jan 2010
Location: Greece
Posts: 1,495
Thanks: 150
Thanked 460 Times in 217 Posts
Default

Searched thoroughly about this and talked to several experts and told me that you don't need those long fins unless possibly you need to measure really high noise levels where you will expect strong echoes in the chamber. Actually they suggested to use a flat (but really thick) surface however I wanted something looking nice, so I went the extra mile and invested on this material, which is new and really expensive.

Learned so many things about anechoic chambers the last couple of months and I can safely state know that I know how to build a perfect one from scratch. Another fact, the ideal chamber should have unequal and non parallel surfaces, however this is a real design challenge. But for my purposes (low noise measurements) there is no need for such extreme designs. I just paid extra attention to the chambers insulation from external noises. Although I live in a not so noisy environment, I still invested on a 52 dBA door and the walls are around 60-70 dBA suppression. The top of the building has 50cm thick ceiling, including special insulation, and the bottom is over 60cm, including two layers of insulation.
Reply With Quote
The Following User Says Thank You to crmaris For This Useful Post:
Internet (03-31-2017)
  #28  
Old 03-31-2017
crmaris's Avatar
crmaris crmaris is online now
Cybenetics CTE
 
Join Date: Jan 2010
Location: Greece
Posts: 1,495
Thanks: 150
Thanked 460 Times in 217 Posts
Default

the chamber that Jonny showed is a fully anechoic one, which isn't suggested for IT equipment. For IT hemi-anechoics are most suitable.
Reply With Quote
The Following 2 Users Say Thank You to crmaris For This Useful Post:
Internet (03-31-2017), Philipus II (03-31-2017)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright © JonnyGURU.com 2000 -