4- 20mA Loop powered products

[charles.mar...@ps.ge.com]

Hi Group

Looking for some input, we have a product that is 4 -20 mA (12- 28VDC) loop
powered. In terms of powerline testing (4-4 & 4-5) how would this product be
tested, as an DC power supply port or as a I/O port. 

Thank You in advance 

Charles R. Martin

GE Panametrics
EMC Lab Supervisor
Main: 1-781-899-2719
Direct: 1-781-472-1602
Fax: 1-781-893-6674
E-mail: charles.mar...@ps.ge.com



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Who sign the DoC?

[charles.mar...@ps.ge.com]

Hi Group,

I have a question without a clear answer. If a manufacturer is outside the
EU, who is required to sign the DoC?
Does that person have to be in the EU?

Thank you in advance,

Charlie Martin


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RE: Surge testing

[charles.mar...@ps.ge.com]

Ian,
 
As, I understand it, depending on which Annex Table you are using (A, B or C),
 Annex A only requires testing of I/O cables, line to ground(note 2) and (note
3) if that cable falls into the category of a long distant cables(see 3.6,
-cables over 30 M or which leaves the building). Annex B, not required and
Annex C, N/A. There is no distinction between shielded or unshielded cables
except for the testing method in 61000-4-5.
 
Regards,
Charlie Martin


From: White, Ian [mailto:ianwh...@spiraxsarco.com]
Sent: Thursday, July 31, 2003 9:41 AM
To: IEEE Forum (E-mail)
Subject: Surge testing


Dear All
 
We are carrying out EMC testing to Controlling standard EN61326, which calls
up basic standard EN61000-4-5 for surge testing.
We have carried out the direct injection of mains ports, and unscreened cables
and that is understood. What l am getting confused with is the need to test
screened cables. 
 
I far as l understand there is no need to test the screen, but does this mean
l don't have to carrying out surge testing on screened cables.
 
 
Thanks for your help inadvance.
 
 
Regards
 
Ian White

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EN61326 and deviations

[charles.mar...@ps.ge.com]

Hi all, 

I have a question, in EN 61326, Table 2, Evaluation of immunity test
results, in the NOTE it states"

That it is recommended that you use criteria A, but that "criteria B may be
accepted provided that both specification and the test report highlight such
deviation(s) for the relevant combinations(s) of function and test"

Does this mean I can Pass, for example, a product that meets criteria B for
4-3, Rad Im. at let's say 5.5 V/m just in a few frequencies only.

How much "highlighting" would I have to do in the Test Report and for the
product spec, what level of details? Would this include the DoC?

Could I say we meet "Criteria A, but in a few frequencies we meet criteria
B, call for more details."


Thank You in advance for all your comments

Charlie Martin


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RE: RADIATED IMMUNITY - Some Actual Measurements of FS

[charles.mar...@ps.ge.com]

But, does EN 61326 give a reduction from 10 to 3V/m at certain frequencies.
I do not think so, for an industrial location, Annnex A, Table A.1, IEC
61000-4-3 is 10V/m. 


From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Tuesday, March 04, 2003 12:58 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: RADIATED IMMUNITY - Some Actual Measurements of FS



I read in !emc-pstc that Jacob Schanker  wrote
(in <006d01c2e1fa$7f0060c0$6401a8c0@net1>) about 'RADIATED IMMUNITY -
Some Actual Measurements of FS' on Mon, 3 Mar 2003:

>I hope this lengthy response was enlightening.

It's extremely useful confirmation of the basis for the '3 V/m' reduced
test level, for which I bear a small part of the responsibility.
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk

Interested in professional sound reinforcement and distribution? Then go to 
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!


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RE: 'DOW' of standards

[charles.mar...@ps.ge.com]

Hi Group,

Does anyone have a clear idea or knows a link that shows the differences
between the old and new 61010 standard.

Thank You

Charlie Martin
GE Panametrics


From: iun...@servomex.com [mailto:iun...@servomex.com]
Sent: Tuesday, January 28, 2003 9:33 AM
To: emc-p...@majordomo.ieee.org
Subject: 'DOW' of standards



Dear Group,

 The  OJ for the LVD (page C317/73) gives 1.1.2004 as being the date beyond
 which   IEC   61010-1:1990/A2:1995  can  no  longer  be  used  to  presume
 conformance  with the requirements of this Directive. After this date, can
 equipment  previously  assessed to this standard still be marketed without
 reassessment to the new standard (IEC 61010-1:2001)? If so, until when?

 Between  1.4.2001  (the  'dow' of IEC 61010-1:1990+A1:1992 (Modified)) and
 1.1.2004   (the   dow   of   IEC  61010-1:1990/A2:1995),  can  either  IEC
 61010-1:1990/A2:1995  or  IEC  61010-1:2001 be used to presume conformance
 with the requirements of LVD?

 Apologies if the answers to the above have been covered before and are
   thus locked up in the group's archives.

 Ian Unwin

 Servomex Group Limited




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RE: Video Cameras for EMC Test Monitoring

[charles.mar...@ps.ge.com]

How do you view the EUT at 180 degee orirentation if the camera is looking
at it backside?

Charlie Martin



From: djumbdenst...@tycoint.com [mailto:djumbdenst...@tycoint.com]
Sent: Thursday, January 16, 2003 1:23 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Video Cameras for EMC Test Monitoring



If the camera is in a can, mesh or otherwise, and the can is bonded to the
skin of the chamber, then is doesn't matter whether the control and power
are copper or fiber.  In effect, the cables are outside of the chamber.
Special filters and connectors are not needed.

Our dome is mounted in the corner of the chamber, behind the antenna.  We
have a clear view of the front of the EUT, and the orientation of the
antenna if we desire with the help of the pan/tilt/zoom capability of our
camera controller.

Best regards,

Don Umbdenstock
Sensormatic

> --
> From: david_ster...@ademco.com[SMTP:david_ster...@ademco.com]
> Reply To: david_ster...@ademco.com
> Sent: Thursday, January 16, 2003 9:28 AM
> To:   ju...@hursley-emc.co.uk; emc-p...@majordomo.ieee.org
> Subject:  RE: Video Cameras for  EMC Test Monitoring
> 
> I use off-the-shelf dome surveillance cameras with an x-y-z+zoom
> controller in the chamber at 20 V/m.  Smoke covers are available for the
> camera mechanism.  Contact me off-line for model numbers.  We turn the
> cameras off during emissions measurements.  Our antenna-EUT axis is
> somewhat diagonal;  we locate the domes toward the side, far off-axis.
>  
> Fiber
> We send video as Ethernet packets over fiber, but converters are PC-based
> and hence large metal objects - not good in an anechoic chamber.  Video
> over twisted pair may be cleaner than 75-ohm, but what about the
> power-supply cable?
>  
> David
> 
>   -Original Message-
>   From: jules [mailto:ju...@hursley-emc.co.uk]
>   Sent: Thursday, January 16, 2003 6:58 AM
>   To: emc-p...@majordomo.ieee.org
>   Subject: RE: Video Cameras for EMC Test Monitoring
> 
> 
>You need to be carefull if you are running copper wires out to the
> remote display as these will pick up the fields. Hursley EMC Services have
> just developed a low cost camera for 10V/m, and we have built a converter
> to run the image, pan/tilt and zoom etc out on two fibre optic leads.  we
> do plan to produce this, but it is unlikely to be ready before mid 2003.
>
>rgds,
>
>Jules Jones
>   -Original Message-
>   From: Ken Javor [mailto:ken.ja...@emccompliance.com]
>   Sent: 15 January 2003 19:29
>   To: Sandi McEnery; emc-p...@majordomo.ieee.org
>   Subject: Re: Video Cameras for EMC Test Monitoring
> 
> 
> 
>   Just put an off-the-shelf unit from Best Buy or Circuit City
> in  a metal screen box, make sure the screen is very close to the lens,
> that way it is totally out of focus and only causes a dimming of the
> picture, not visible distortion.
> 
>   --
>   From: "Sandi McEnery" 
>   To: 
>   Subject: Video Cameras for  EMC Test Monitoring
>   Date: Wed, Jan 15, 2003, 12:34 PM
> 
> 
> 
> 
>   We are in the process of purchasing  video cameras
> for monitoring EMC Immunity testing up to 10V/M.  Pricing for cameras
> designed to withstand 20V/M is way high
>
>     do any of you successfully use cameras that
> are not as sturdy?  Or ... does anyone know where we might purchase a used
> system??
>
>
>   Sandi McEnery
>   US Technologies
>   770-740-0717(ph)
>   770-740-1508 (fax)
>   smcen...@ustech-lab.com
>  
> 
> 
> 
> 


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 Dave H

RE: Video Cameras for EMC Test Monitoring

[charles.mar...@ps.ge.com]

Hi Sandi,
 
We use a regular Panasonic VHS-C palmcorder @ 10V/m and have no problems with
it, besides some noise at certain frequencies mostly with AM. The auto focus
screws up on occasion, but with 20X optical zoom the picture is great and does
the job for ~$300.00.
 
Charlie Martin
EMC Lab Supervisor
GE Panametrics


From: Sandi McEnery [mailto:smcen...@ustech-lab.com]
Sent: Wednesday, January 15, 2003 1:35 PM
To: emc-p...@majordomo.ieee.org
Subject: Video Cameras for EMC Test Monitoring


We are in the process of purchasing  video cameras for monitoring EMC Immunity
testing up to 10V/M.  Pricing for cameras designed to withstand 20V/M is way
high
 
  do any of you successfully use cameras that are not as sturdy?  Or ...
does anyone know where we might purchase a used system??
 
 
Sandi McEnery
US Technologies
770-740-0717(ph)
770-740-1508 (fax)
smcen...@ustech-lab.com