That's Tesla, which is a weber per sq meter. It is a measure of the B
field, flux per area. If you're English, 1 tesla is 10,000 gauss.
I don't believe those numbers. We have light rail train go by here which is
powered by 600Vac (I believe it's 600 Vac) I haven't seen the fields from
the motors, only the fields from the disturbance to the earth's field
(approx 50uT) as it is being deflected by the large metal vehicles. Much
more an effect than from the power source.
If those specs you quoted go down to 50 Hz or 60Hz, than they relate,
otherwise doubt if you'lll easily relate them. It would be "susceptibility
to AC mains magnetic fields."
Might also look at the Swedish MPR II, or is that III now? The limit for a
monitor radiating is 200nT in this bandwidth.
Underneath high tension wires I've seen fields around 100mG, which
translates to 10uT! and those fields are considered big.
Again, I question those specs. Maybe they meant 0.6 to 1.7 microtesla.
- Robert -
Robert A. Macy, PE m...@california.com
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San Jose, CA 95112
-----Original Message-----
From: marti...@appliedbiosystems.com <marti...@appliedbiosystems.com>
To: emc-p...@majordomo.ieee.org <emc-p...@majordomo.ieee.org>
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, February 07, 2002 3:15 PM
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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