Welcome Guest! The IOSH forums are a free resource to both members and non-members. Login or register to use them

IOSH Forums are closing 

The IOSH Forums will close on 5 January 2026 as part of a move to a new, more secure online community platform.

All IOSH members will be invited to join the new platform following the launch of a new member database in the New Year. You can continue to access this website until the closure date. 

For more information, please visit the IOSH website.

Postings made by forum users are personal opinions. IOSH is not responsible for the content or accuracy of any of the information contained in forum postings. Please carefully consider any advice you receive.

Notification

Icon
Error
Sound Level Meter Interference from Mobile
Options
Go to last post Go to first unread
Previous Topic Next Topic
Admin  
#1 Posted : 18 January 2008 14:40:00(UTC)
Rank: Guest
Admin
Posted By peter gannaway
I have noticed that my mobile phone significantly affects the reading from my Sound Level Meter when held in close proximity, say 2-3 feet. The effect was to change a result of 65dBA to over 100. I cannot see any reference to this on the web, or in the suppliers (Castles) literature and wondered if anyone else can provide guidance on at what distance from the meter the phone can safely be held without affecting the result. I would also be interested if someone can explain why this happens.
Back to top
Admin  
#2 Posted : 18 January 2008 14:58:00(UTC)
Rank: Guest
Admin
Posted By Robert.
I'm not qualified to comment, but your posting prompted me to do a google.
I was surprised at the db level that some phones reach though.

Mobile Phone Ring Tone Volume (decibels)

Pantech Duo 85.7
Helio Ocean 85.4
Palm Centro 85.5
HTC Tilt 85.7
Nokia N95 105.3
Back to top
Admin  
#3 Posted : 18 January 2008 15:52:00(UTC)
Rank: Guest
Admin
Posted By Ron Hunter
Sounds like a possible EMC "CE" issue (I guess you're not talking about volume, more to do with the feedback effect I sometimes here through my computer speakers? Why not discuss it with Castle? They are nice people.
Back to top
Admin  
#4 Posted : 18 January 2008 18:29:00(UTC)
Rank: Guest
Admin
Posted By peter gannaway
Sorry not to clarify, the interference isn't caused by volume, just seems to drive the machine crazy when the phone is switched on near it. Thanks I will speak to Castle they are nice people, just I hadn't heard of it and wondered if anyone else had the same experience.
Back to top
Admin  
#5 Posted : 23 January 2008 09:00:00(UTC)
Rank: Guest
Admin
Posted By Garry Homer
Radio Frequency emissions from your mobile phone - continuous even if not in use, is in the form of pulses. The electric field of these emissions will be greater than 3 volts/metre, the CE max tolerance level, so you should expect it to have this effect.

Wrapping the meter in tin foil should stop it, or turn the phone off!

Garry
Back to top
Users browsing this topic
Guest
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF.NET | YAF.NET © 2003-2026, Yet Another Forum.NET