Re: [PSES] Measurement dilema

[Dale Reid]

How about the different size loops the ground leads on your probes are
making.

*Dale Reid*
Product Safety Engineer
*O*  +1 859 825 4733
re...@lexmark.com
<http://www.lexmark.com/>
www.lexmark.com

On Sun, Jan 28, 2018 at 7:54 AM, Bart De Geeter <bart.de.gee...@telenet.be>
wrote:

> Hi Doug,
>
>
>
>Could it be that there is just a piece of transmission line
> inside the box terminated with a certain impedance?  You might be measuring
> in the middle of this transmission line.
>
> If the input impedance selected on channel A of your oscilloscope is f.e
> 50 ohm  and the other input channel has 1Mohm input impedance selected, you
> will measure a different voltage at this particular point (as the measured
> signal is the sum of the direct wave+ reflected wave on this transmission).
>
>
>
> So far, my guess 
>
>
>
> Greetings,
>
> Bart
>
>
>
> *Van:* Doug Smith [mailto:d...@emcesd.com]
> *Verzonden:* vrijdag 26 januari 2018 23:50
> *Aan:* EMC-PSTC@LISTSERV.IEEE.ORG
> *Onderwerp:* [PSES] Measurement dilema
>
>
>
> Hi All,
>
> Can you explain the result in this video I just made? Scope plots of the
> same two nodes are completely different. Probes and scope are operating
> normally, no problem with the equipment itself.
>
> If you have been to my seminars you know the answer, please do not post
> the answer unless you have not seen this experiment until now.
>
> Hint 1: There are no EM fields radiating from the shielded box affecting
> the probes.
> Hint 2: There are no active components inside the box.
>
> https://youtu.be/qj-HBFMEJiY
>
> Doug
>
> -
> 
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[PSES] Solar electric cars built by college students

[Dale Reid]

Hello,

Speaking of grounding, can someone share some thoughts on what would be the
best practice regarding an earth ground for an electric car while plugged
in and charging from the grid?  Would it be best to tie a car's metal frame
to ground while it's hooked up for a charge?

*Dale Reid*

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Re: [PSES] Rechargeable lithium battery EU Standards/Directives

[Dale Reid]

http://incompliancemag.com/article/ul-62133-a-globally-harmonized-option-for-portable-battery-compliance/

*Dale Reid*
Product Safety Engineer
*O*  +1 859 825 4733
re...@lexmark.com
<http://www.lexmark.com/>
www.lexmark.com

On Fri, Oct 28, 2016 at 2:41 PM, Stephen Whalen <scwha...@bellsouth.net>
wrote:

> All,
> I am trying to identify the necessary EU standards and directives for
> rechargeable lithium batteries for small electronic devices.  Any help
> would be greatly appreciated.
>
> Regards,
> Stephen
> -
> 
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[PSES] EVs and the HV wire they use

[Dale Reid]

For an electric vehicle's HV wiring, is the concept of double / reinforced
insulation practiced?  Let's say I wanted to build an electric car for use
on the road that had a 200V main battery pack.  What would be the
appropriate wire type to use in this application?

-- 
*Dale Reid*
Product Safety Engineer

*O*  +1 859 825 4733
re...@lexmark.com

<http://www.lexmark.com/>
www.lexmark.com

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Re: [PSES] Wireless charging

[Dale Reid]

Here's another IEC publication that talks about the state of things.  I
didn't realize IEC site was a good place to start looking for info on the
topic.  There seems to be two main camps; small power (phones) and much
bigger power (automotive).

http://iecetech.org/issue/2015-01/No-wires-no-tangles

Thanks for all the comments.

On Thu, Sep 24, 2015 at 2:36 AM, John Woodgate <j...@jmwa.demon.co.uk> wrote:

> In message <fe454ecafb4cfe4a89dd78f78ef9e38fb20...@ser-ex01.siq.si>,
> dated Thu, 24 Sep 2015, =?iso-8859-2?Q?Bo=B9tjan_Glavi=E8?= <
> bostjan.gla...@siq.si> writes:
>
> TC100 is dealing with interoperability of IT, A/V and multimedia products.
>> I do not think they will include any safety requirements.
>>
>> I think TC108 will need to take over that.
>>
>
> I agree, but it hasn't by any means completed its work yet. An initial
> document has been circulated, but there is a long way to go before
> requirements appear in IEC 62368-1. The emphasis is on the thermal burn
> hazard from the heating of metal objects placed in the charging field
>
> --
> OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
> When I turn my back on the sun, it's to look for a rainbow
> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
>
> -
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-- 
*Dale Reid*
Product Safety Engineer

*O*  +1 859 825 4733
re...@lexmark.com

<http://www.lexmark.com/>
www.lexmark.com

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[PSES] Wireless charging

[Dale Reid]

Hello,

Question.

How the safety world is dealing with wireless charging products hitting the
market?  Which standards are they being certified to?  I'm curious what the
main issues with them are if there are any.  I assume they aren't
overloaded if someone places a pile of metal coins (or their hand) between
a charger and their cell phone for example.

*Dale*

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[PSES] IEC 61643-11

[Dale Reid]

Hello,

Does anyone here have experience with having a product tested to IEC
61643-11?  If you wouldn't mind to share about the experience, feel free to
make direct contact.

I'm also a bit curious how common it is to see product on the market tested
to this standard.

Thanks,
Dale

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