I think the units you're looking to compare to would be Amps/meter. The
conversion from Tesla to A/m is:

1 A/m = 1.26 uT = 0.0126 Gauss

Therefore, a field of .7 mT converts to 555 A/m !!! (it is also equivalent
to 10 Gauss)

Assuming that your customer is referring to power frequency magnetic fields,
this would be substantial, to say the least.

I would recommend that you question your customer a little further as to how
they determined this field strength requirement. It seems high by a factor
of about 1000.

Good luck,
Mike

-----Original Message-----
From: marti...@appliedbiosystems.com
[mailto:marti...@appliedbiosystems.com]
Sent: Thursday, February 07, 2002 4:22 PM
To: emc-p...@majordomo.ieee.org
Subject: Teslars???



We have a customer that is concerned about how our product, laboratory
equipment, will respond to electromagnetic disturbances from a high speed
train that runs close to their lab.  The customer states that the
disturbance will be around 0.7-1.2 m Teslar.

Can someone please explain what the unit Teslar is and how that unit
relates, or if it relates, to the immunity tests of EN 61000-4-3 Radiated
immunity, or any other immunity test.

Has anyone ever had a similar concern from a customer dealing with this
type of disturbance?

Your responses are appreciated.

Regards

Joe Martin
EMC/Product Safety Engineer
Applied Biosystems
marti...@appliedbiosystems.com




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