Ken very succinctly put. I believe it was me that you responded to in an
earlier posting regarding Broadband over PowerLine (PowerLine
Telecommunications in the UK and Europe).
I have been trying to explain the point that you have made to those that write
reports estimating the likely effects of
There is a significant over-generalization here. An electrically small probe
does not have to convert rf into heat and thereby measure total broadband
pickup. There are any number of electrically short whips, dipoles and loops
whose transducer factors as a function of frequency are well character
Bob Heller asked:
>> How would one go about accurately measuring low frequency fields say at
10
kHz where the far-field even at lambda/6 is 5000 meters? <<
Accuracy and what regulatory authorities require are not always the same
thing. It isn't hard to measure the magnetic field accurately, given
By measuring the E and H components separately, using near-field probes, which
are, in principle, electrically short dipoles and loops. The biggist price to
pay is the sensitivity, since they are electrically short. Also, they pick up
the broadband field that gets detected in the detector circuit (
How would one go about accurately measuring low frequency fields say at 10
kHz where the far-field even at lambda/6 is 5000 meters?
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=
> -Original Message-
> From: Bob Richards [ mailto:b...@toprudder.com]
> Sent: Thursday, June 23, 2005 7:06 AM
> To: emc-p...@ieee.org
> Subject: Re: ??? RE: ??? RE: Near field H-field measurement.
>
> Ken,
>
> I believe you are correct. There should be factors for this
> loop ant
I can't help you with refurbished, but Chroma ATE Inc. of Taiwan manufacture a
range of AC Power Sources that would more than meet your requirements. You
will find that their prices are very reasonable compared to manufacturers from
the other side of the Pacific, and the construction quality is exc
Hi Group,
Generally speaking, the US, Canada and Japan use T1 and everyone else is on E1.
But there are countries like South Korea, Taiwan, Hong Kong and a few others
that also use T1. And I hear there are some countries that actually can use
both protocols.
Does anyone know of a website/link o
Bob,
You must be a crotchety old-timer like myself. Re the following from the
appendix in MIL-STD-461E (it's there because I asked for it). The part I
refer to is in italics.
"Placement of limits can be done in several ways. Data may be displayed with
respect to actual limit dimensions (such a
Ken,
I believe you are correct. There should be factors for
this loop antenna from Emco that convert the raw
reading (in dBuv) to a magnetic field level (like
dBuA/m).
The spectrum analyzer does NOT read in dBuv/m as he
seems to suggest, it only reads in dBuv or dBm, but
some anaylzers do allow f
We are seeking a candidate for a Full Time position of Senior Approvals
Engineer.
Please contact me with a copy of your CV if interested.
Best Regards
Carl
Carl Richards,
Regulatory Compliance Manager,
Aspect Communications
2, The Square
Stockley Park, Uxbridge, UB11 1AD,
United Kingdom
I may be reading this post wrong, but the -51.5 dB factor is not an antenna
factor at all. It is the ratio of magnetic to electric field intensity in a
plane wave. It is -20*log (377). The use of that number is quite approximate
in the near field of the transmitter.
From: Y W Leung
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