Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Way back once upon a time, we had tested a shielded chamber, that needed, according to the spec's, a SE higher than some number like you mention.   Our initial testing revealed a few weak points.  The several re-designs fixed those, but the purchase spec for the interface panel to the outside

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Bill: I was responding with the best anecdotal experience that I had on the subject, but what I described was actually a big “science project.” I was testing, actually, investigating might be a better term, the shielding effectiveness of various compartments of what became the AGM-109 Tomaha

Re: [PSES] new EMC Directive

Brian, Based on a quick reading, I think that for the case of manufacturers who take responsibility to self-declare compliance, the draft new directive makes few changes to the current rules. For the use of 3rd party experts (Conformity Assessment Bodies or Notified Bodies) who are used to con

Re: [PSES] new EMC Directive

In the spirit of the changes and on a slim chance this was not brought up before, there will be updated LVD and new RE Directive, formerly known as R&TTE Directive coming to your neighborhood theater. RE is a new Radio Equipment directive, dropping Telecom and Terminal out of it. Main idea is

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Don¹t understand the post below. The original post starting this thread only asked for definitions. My initial response cited the fact that MIL-STD-461 only allows mode-tuned, not mode-stirred testing. A later post seemed to imply that the higher the frequency, the more paddle positions would be ne

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

The large size you mention rings a faint bell of memory... There was some caution about using a chamber at frequencies above its first resonance which is based on size. The peaks and nulls of the multi-modal chamber then skew the reverb pattern along those peaks and nulls. Do I remember correc

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

I was then and am still the casual observer of reverb testing, but have noticed over the course of a number of conversations on MIL-STD testing there seems to be an oxymoronic appearance to the processes without a detailed definition or explanation of how a particular process came about. And the

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

In message , dated Thu, 9 May 2013, "McInturff, Gary" writes: Reminds me of when I first read up on a Gigawatt laser. I tried to image how the measured the output. Did they put the worst performing technican on the range and have him hold up the photometer and yell ? ?Okay turn it on?! D

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Ed, Reminds me of when I first read up on a Gigawatt laser. I tried to image how the measured the output. Did they put the worst performing technican on the range and have him hold up the photometer and yell - "Okay turn it on"! In checking their website I didn't notice any new technician positio

Re: [PSES] new EMC Directive

Thanks for the links, Ted. Some context on the EU legislative process - The document Ted provided the links to is the input proposal from the EU Commission to the Council and the Parliament. As those two "houses" debate things, amendments to the Commission proposal will be put forward and argue

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Yes that is correct. Respectfully, Frank Krozelt: 1-630-924-1600 f: 630-477-0321 e: fr...@electronicinstrument.com BSEE, AASEET, Lic# PG-18-19178, KG9H ~~ Electronic Instrument Associates-Central, Inc since 1971 w: www.electro

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

The chamber is about a cubic yard, with a window. Ken Javor Phone: (256) 650-5261 From: Ed Price Date: Thu, 9 May 2013 10:43:27 -0700 To: Subject: RE: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference? That would be great to see; do you make us look in through a shielded window

Re: [PSES] new EMC Directive

I received an email from NIST this morning. They (EUANB) have met again on May 3rd in Dublin, Ireland. The information I have is "the revision will be adopted in October 2013, publication by the end of the year, and then they will prepare guidelines for the transition period between the current an

Re: [PSES] new EMC Directive

You will find information on the New Legislative Framework (NLF) alignment for the EMC Directive at the following link. http://ec.europa.eu/enterprise/sectors/electrical/emc/index_en.htm If your e-mail accepts embedded links, you can find the draft here

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

That would be great to see; do you make us look in through a shielded window or do we get to go inside and hold one of the fluorescent tubes? Ed Price WB6WSN Chula Vista, CA USA From: Frank Krozel [mailto:fr...@electronicinstrument.com] Sent: Thursday, May 09, 2013 10:23 AM To: EMC-PSTC

Re: [PSES] new EMC Directive

They, a grouping of 'them', met in December. Here is a synopsis: Perhaps the EMC experts of this august body can expound for the corps of unwashed compliance engineers. In a similar conspiracy,

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

There is a nice little demo that one can usually see at the EMC Symposium where someone (don¹t recall who) has a small reverb chamber with some fluorescent lamps that come on and go off as the paddle is stirred. Ken Javor Phone: (256) 650-5261 From: Ed Price Date: Thu, 9 May 2013 10:04:56 -070

Re: [PSES] new EMC Directive

Will you provide details as to where you obtained your information? Thanks, Gregory Popp gp...@ysi.com www.ysi.com From: Knighten, Jim L [mailto:jim.knigh...@teradata.com] Sent: Thursday, May 09, 2013 12:17 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PS

Re: [PSES] new EMC Directive

Gregory, I find reference to it on the Internet. http://www.metlabs.com/blog/tag/euanb/ Jim __ James L. Knighten, Ph.D. EMC Engineer Teradata Corporation 17095 Via Del Campo San Diego, CA 92127 858-485-2537 - phone 858-485-3788 - fax (unattended) From: Popp, Greg - Xyle

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

I view the power density concentrations as varying density little clouds, chimera, moving regularly in 3 dimensions, and continuously changing their dimensions as they move. The presence of the ground plane, stirrer supports, antenna and EUT would have the motions not always linear. The motions wou

Re: [PSES] Flicker help

In message <2d77bd88981bd243829b548acfc608bb01d1c...@uusnwe1k.na.utcmail.com>, dated Thu, 9 May 2013, "Wiseman, Joshua E" writes: With this type of machine I have been referring to A.14 of IEC 61000-3-3 for the test criteria.  There are a couple of items in A.14 that don?t seem to be very c

[PSES] new EMC Directive

I hear that there is a new EMC Directive being put forward. (The current directive is Directive EMC 2004/108/EC.) Does anyone know what changes this proposed new EMC Directive implements. Jim __ James L. Knighten, Ph.D. EMC Engineer Teradata Corporation 17095 Via Del C

[PSES] ATEX Qualified Contract Manufacturer

I have a client who is looking for a low volume contract manufacturer located in Asia (preferably Taiwan or China) who has a EN 80079-34 registered quality system in place. Any suggestions? Regards, Tom Smith, P.Eng Principal Engineer TJS Technical Services Inc. Tel: +1 403-612-6664 Email: tsm.

[PSES] Flicker help

A little background first. I am testing single phase commercial soft serve ice cream machine similar to what you might find at a fast food restaurant or a local ice cream vendor. The unit normally draws less than 1A of current until the compressor and motors turn on, at that point the current

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Well, an area of constructive or destructive interference is going to have dimensions on the order of a half-wavelength. That sets the upper bound on the illumination spot-size. Clearly, the spot size decrease with increasing frequency. Ken Javor Phone: (256) 650-5261 From: Luke Turnbull Date

[PSES] Antenna information Required

Hi All Can any one provide a data sheet for an IFI EFG-2 Antenna. Regards Andy Andrew P. Price Principle Environmental Engineer, (EMC Specialist) SELEX ES, A Finmeccanica Company Sigma House Basildon Essex SS14 3EL * Tel EMC LAB : +44 (0)1268 883308 *Mobile : +44 (0)7507 854888 email :

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

The picture I have in my mind is that there's a (or several) relatively small hot spot(s) - you could say will-o'-the-wisp(s) - that dart around the test chamber as the paddles move. Therefore my understanding is that a large system isn't simultaneously illuminated by the reverb method. Luke T