Chris,
I've been doing a similar test for years, only I use a pin solderd to about 2
feet of wire. This way I don't actually touch the circuit myself.
FYI,
Derek.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee
Hi Don.
Thanks for the example. Hearing about these kinds of experiences makes
troubleshooting easier for everyone I think. Thanks to Chris Maxwell for
his contribution too. It'd be great to hear more stories from the
experience of some other members of the group.
I think your approach was
michael.sundst...@nokia.com
amateur call: KB5UKT
-Original Message-
From: EXT Peter Poulos [mailto:pet...@foxboro.com.au]
Sent: Friday, September 15, 2000 1:38 AM
To: marti...@appliedbiosystems.com; emc-p...@majordomo.ieee.org
Subject: Re: Near Field Versus Far Field
Hi Joe.
You asked
Several excellent ideas have been put forward on this phenomenon. Here is
my $.02 worth on the subject.
I have often been able to reduce the far-field emissions, based on the
reduction in near-field emissions. The important thing is to co-relate the
far-field and near-field emissions, by
Hi Joe.
You asked for an explanation as to why the difference between the near and
far field results. I think the replies so far have probably answered that
question. I've tried here to give some help with the real problem of
solving the excess emissions.
From my own experience and
-917-5021
michael.sundst...@nokia.com
amateur call: KB5UKT
-Original Message-
From: EXT Peter Poulos [mailto:pet...@foxboro.com.au]
Sent: Friday, September 15, 2000 1:38 AM
To: marti...@appliedbiosystems.com; emc-p...@majordomo.ieee.org
Subject: Re: Near Field Versus Far Field
Hi Joe
Hello Joe,
Consider the following -- in the far field (3 or 10 meters), a plane wave is
monitored. In the near field, using either commercial or lab built
near-field probes, either E field or H field emissions will be monitored
separately. The E, H components will be isolated. The emission
: michael.sundst...@nokia.com [SMTP:michael.sundst...@nokia.com]
Sent: Friday, September 15, 2000 8:59 AM
To: pet...@foxboro.com.au; marti...@appliedbiosystems.com;
emc-p...@majordomo.ieee.org
Subject: RE: Near Field Versus Far Field
I might add that the BEST way to do this is to only
Joe,
Let me try this one,
The near field is composed of a sum of terms 1/r, 1/r^2, etc. and the far
field is only composed of the 1/r term. If your 10dB reduction was solely
due to a reduction in the higher order terms, 1/r^2 etc, then in the far
field no reduction will have taken place.
I
Mr. Martin, have you thought about the fact that the near-field probe does
not integrate the whole radiation sphere from your product? On the 10 m
site, your antenna sees radiation components from all parts of the EUT,
including any cables; while your near-field probe in the lab cannot pick all
...@majordomo.ieee.org
Subject: RE: Near Field Versus Far Field
Mr. Martin, have you thought about the fact that the near-field probe does
not integrate the whole radiation sphere from your product? On the 10 m
site, your antenna sees radiation components from all parts of the EUT,
including any cables; while
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