A clamp-on current probe such as Tektronix sells will work well. If you need
something that will slip over a human arm, Pearson (and others) make
suitable current viewing transformers.
These current viewing transformers are generally built like this:
1) 1 turn primary (the path that the current
From: Hudson, Alan (UK) [mailto:alan.hud...@baesystems.com]
Sent: Thursday, February 08, 2007 7:30 AM
To: emc-pstc@LISTSERV.IEEE.ORG
Subject: RE: MI STD 461 notices
G'Day!
Glad to be of service! Puts back some of what this emc-pstc gives out.
In the beginning there was 461, which begat 461A, wh
Hi All,
We need a lab that has the capability to perform the 3-home test for Carrier
Current testing.
If anyone has a lab they would care to recommend, I’d appreciate getting it!
Thanks!!
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax
From: Haynes, Tim (SELEX) (UK Capability Green)
[mailto:tim.hay...@selex-sas.com]
Sent: Thursday, February 08, 2007 8:04 AM
To: rehel...@mmm.com; emc-p...@ieee.org
Subject: RE: Contact Currents
Unfortunately there is no standard that tells you how to measure contact
currents above 1 MHz.
Hmmm
Richard:
Can't help you directly, but there is a Yahoo group (called Manual Exchange)
that is dedicated to sharing equipment manuals. Suggest you join and post
there. If that doesn't work, you can try eBay. The last place resort manual
merchants, like:
http://www.consolidatedsurplus.com/
http:/
So have we but there is no official method that would have everyone conform
to the same method.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=
Unfortunately there is no standard that tells you how to measure contact
currents above 1 MHz.
Hmmm...
If I have a small inductor less resistor in series with the RF supply and I
measure the voltage across the resistor and divide by the resistance - maybe
that would do?
I am sure I have measure
However the energy is transferred to the body tissues, and RF currents and
voltages are induced. At frequencies that begin to exceed 100 kHz, the
effect is energy absorption in the tissues (heating). At these frequencies,
it is considered that there is no neuro or muscular stimulation. The effec
Those are the limits used to measure EMFs in such standards as 50366 and
50392.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=
Unfortunately there is no standard that tells you how to measure contact
currents above 1 MHz.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=
In message <20070208151604.m86...@elen.it>, dated Thu, 8 Feb 2007, Paolo
Peruzzi writes
>Is it reasonable to assume that for frequencies above 100 kHz, a direct
>application of rf current to the human skin is very unlikely (or
>unable) to cause ventricular fibrillation?
No-one should answer s
My original question had nothing to do with SAR, because I'm talking about
devices which deliver rf power "galvanically" to the patient skin, by means
of an electrode.
Is it reasonable to assume that for frequencies above 100 kHz, a direct
application of rf current to the human skin is very unl
G'Day!
Glad to be of service! Puts back some of what this emc-pstc gives out.
In the beginning there was 461, which begat 461A, which begat Notices 1
to 6 on A, then B, C, C plus Notice 1, D, E, .
:-)
Alan
From: Derek Walton [mailto:lfresea...@aol.com]
Sent: Thursday 08 February 2007 15
Alan,
you are the man ( I believe that is modern speak for you did it!! ). My
sincere thanks. That is exactly it!
Derek Walton
L F Research
Hudson, Alan (UK) wrote on 2/8/2007, 8:45 AM:
>
> G'Day!
>
> I've found a copy (well, a microfiche copy) - I'll send it to you by
> separate email.
Hello Group,
We just purchased a used Magtrol Model 4614 polyphase power analyzer
to replace another similar unit which was in need of repair. The new/used unit
did not arrive with a user's manual.
Does anyone in the group have one of these units with a manual? If so,
I'd like t
I pulled the following tables from a document that regurgitates the ICNIRP
limits.
It clearly gives limb currents and, by default, I assume that the other limits
must be for other parts of the body. Since these are contact currents - the
current flows through the body - which is what I think y
...well, perhaps I should have said "a copy of 461 with Notice 4
incorporated", rather than the Notice itself.
:(
Alan
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Hudson,
Alan (UK)
Sent: Thursday 08 February 2007 14:46
To: IEEE EMC Discussion Group
Cc: lfresea...@aol.com
G'Day!
I've found a copy (well, a microfiche copy) - I'll send it to you by
separate email.
Regards
Alan
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Derek
Walton
Sent: Thursday 08 February 2007 13:46
To: IEEE EMC Discussion Group
Subject: MI STD 461 notices
Morning folks,
In message <20070208112427.m53...@elen.it>, dated Thu, 8 Feb 2007, Paolo
Peruzzi writes
>Yes, thank you, I know them and I've already searched in between.
>Unfortunately they don't say nothing about limits (neither IEC
>60601-2-3, which could be the only suitable standard). Actually I
>wonder
Morning folks,
I've been trying to locate a source for MIL STD 461A Notice 4 ( yes, it's not
a typo ). I've found almost everything but notices for the A version. Does
anyone have a suggestion?
Thanks,
Derek Walton
L F Research
___
Paulo,
Check out the Bibliography at the end of IEC 60601-1:2005. References [48] to
[54] seem to cover this subject, though I think the emphasis is on 50/60Hz
currents.
Regards,
Jon Griver
http://www.601help.com
The Medical Device Designer's Guide to IEC 60601-1
On 08/02/07, Paolo Peruzzi
Yes, thank you, I know them and I've already searched in between.
Unfortunately they don't say nothing about limits (neither IEC 60601-2-3,
which could be the only suitable standard).
Actually I wonder if there is any scientific and experimental paper or
guidance to shed light on this issue.
P
In message <20070208091552.m35...@elen.it>, dated Thu, 8 Feb 2007, Paolo
Peruzzi writes
>I'm looking for a guidance on the effects of currents on the human body
>for frequencies above 100 kHz and up to tens of MHz. I've read IEC
>60479-2 and ICNIRP guidelines, but none of them seems to give
>s
John Woodgate wrote..
I think you misunderstood. I didn't mean that the USB port was a
peripheral; I used that term for whatever is powered via the USB port.
===
So, if it is a USB powered camera does that make it peripheral vision?
;-o
Regards
Tim
**
I saw an item on TV regarding the use of USB powered/controlled devices of an
erotic nature.
If they are designed for internal use are they medical devices?
Regards
Tim
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate
Sent: 07 February 2007 18:28
To: emc-p...@
Dear all,
I'm looking for a guidance on the effects of currents on the human body for
frequencies above 100 kHz and up to tens of MHz.
I've read IEC 60479-2 and ICNIRP guidelines, but none of them seems to
give satisfactory information to set a reasonably safe
current/voltage/power limit for an
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