Re: Magnetic field monitors

1999-12-17 Thread Ralph Cameron 

Health Canada, under Safety Code 6 specifies magnetic field strength in A/m
.

Ralph Cameron
EMC Consultant and Suppression of Consumer Electronic Equipment
(After Sale)

- Original Message -
From: Mike Hopkins mhopk...@keytek.com
To: 'Rich Nute' ri...@sdd.hp.com
Cc: 'IEEE' emc-p...@ieee.org
Sent: Friday, December 17, 1999 6:42 AM
Subject: RE: Magnetic field monitors



 IEC 1000-4-8 require testing products in a square loop with magentic field
 strengths expressed in Amps/meter; hence, customers want
 measurement/monitoring equipment that reads in Amps/meter.

 Page 17 of 1000-4-8 states The magnetic field strength is expressed in
A/m;
 1 A/m corresponds to a free space induction of 1.26uT.

 Mike Hopkins
 mhopk...@keytek.com

  -Original Message-
  From: Rich Nute [SMTP:ri...@sdd.hp.com]
  Sent: Thursday, December 16, 1999 6:02 PM
  To: mhopk...@keytek.com
  Cc: emc-p...@ieee.org
  Subject: Re: Magnetic field monitors
 
 
 
  Hmmm.  Let's see:
 
  Magnetic field strength is measured in:
 
  amperes/meter
  oerstads
 
  Magnetic flux density is measured in:
 
  tesla
  gauss
 
  As near as I can tell, there is no conversion from
  one to the other.  This would imply they are
  separate phenomenon.
 
  I'm not in the EMC field, but I'm curious as
  to regulatory requirements and what interferences
  such emissions would cause.  (I'm presuming both
  are regulated.)
 
 
  Best regards,
  Rich
 
 

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Magnetic field monitors

1999-12-16 Thread Mike Hopkins 

Our customers have asked us to supply a meter which can be used to
monitor/measure magnetic fields in Amps/meter for setting up tests IAW IEC
61000-4-8. We've been offering a meter made in the U.S that reads in Gauss
(seems okay for U.S. customers), but some customers in the far east are
insisting on meter that reads in international units. We suggested a meter
made by a German company that reads in Tesla, but they said, No, we need
international units of Amps/meter.

Anyone out there make a meter that reads in Amps/meter \??? We've not been
able to locate one.

Thanks

Best Regards

Michael Hopkins
mhopk...@keytek.com
Tel: 1-978-275-0805 ext. 134
Fax: 1-978-275-0850


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