Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-07 Thread Bill Owsley
 ps.  Old knowledge from old prior career experiences.
I use arc welding cables for connections, not 4 ga wire that takes a pipe 
bender to work into place.
Welding cables, are multi wire, and that means "multi" with a capital.
Very flexible and capable of very high amps.  It is for arc welding and 
flexible use !


On Friday, April 5, 2024 at 09:10:22 PM EDT, Lfresearch 
<00734758d943-dmarc-requ...@listserv.ieee.org> wrote:  
 
 The way I understand this is that if we are in the USA, then our 240 volts is 
likely Bi-Phase, not like Europe which has the Line swinging about the neutral 
by 240 volts. In that case you can use a V LISN, or two single phase LISN’s.
In the USA with a Bi-Phase you need 3 LISN’s. When I test these, I use a 3 
phase LISN rather than 3 individual LISN’s. It’s crazy to split the power cord 
to reach the mains terminal on each LISN.
Take care listening to sales guys….
My 10 cents,
Derek.


On Apr 5, 2024, at 7:24 PM, Ken Javor  wrote:

I may be missing something here, but you would need a pair of LISNs for a box 
that runs off a single phase and neutral.  Most equipments of which I am aware 
use the same power connector pins whether 120 or 240 V. In that case, you just 
need one pair of LISNs. If for some reason your box runs off both 120 V and 240 
simultaneously, then you would need two pairs of LISNs.  Current rating is 
whatever you need. I believe there are several manufacturers offering models 
designed for up to 16 A.   --   Ken JavorPh: (256) 650-5261     Hello and Happy 
Friday, I've got a sales guy telling me our 120/240V EUT needs two pair of 
single-phase LISNs for our CE test bench.That's only slightly cheaper than a 
3-phase unit at > 50A, but very bulky. Can someone remind me why I'd need 4, 
50A single-phase LISNs for our unit?  I could see 3 (one for the neutral) but 
I'm not so savvy on EMC test equipment. thanks,  Colorado Brian From: Brian 
Gregory 
Reply-To: Brian Gregory 
Date: Friday, April 5, 2024 at 5:01 PM
To: 
Subject: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase 
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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-07 Thread Bill Owsley
 Long ago, the company had the budget, so we bought single phase for each line.
Thinking that we did not want any cross talk interference, which we had already 
experienced in the real world.
Then we also had built the various configurations for supply power that we 
used.  
In essence measuring sources and load responses !

Sales people, good for prices only.  cannot even get dimensions right.


On Friday, April 5, 2024 at 09:43:31 PM EDT, T.Sato  
wrote:  
 
 On Fri, 5 Apr 2024 22:01:29 GMT,
  Brian Gregory  wrote:

>  Hello and Happy Friday, I've got a sales guy telling me our 120/240V EUT 
>needs two pair of single-phase LISNs for our CE test bench.That's only 
>slightly cheaper than a 3-phase unit at > 50A, but very bulky. Can someone 
>remind me why I'd need 4, 50A single-phase LISNs for our unit?  I could see 3 
>(one for the neutral) but I'm not so savvy on EMC test equipment.

I think you can use either single 3-phase (usually 4 conductors + PE) LISN
or two single-phase (2 conductors + PE) LISNs whichever you like, although
I would prefer to use a single 3-phase LISN.

BTW, there maybe confusion with the term "single-phase LISNs" here.
Is it LISNs commonly used for single-phase AC supply?
Or is it LISNs for an single power supplying conductor?

Regards,
Tom

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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread Brent DeWitt
It may be worth noting at any LISN using magnetic cores/elements in the 
50uH bit, must be calibrated at the maximum rated current to verify that 
saturation isn't a problem.


On 4/5/2024 9:56 PM, Brent DeWitt wrote:
In my opinion, all of this is rather simple.  Any LISN, ANSI or CISPR, 
references the noise to "ground".  Any conductor not being measured 
should be terminated in 50 ohms.  Whatever network used needs to make 
that so.  Take your pick.


On 4/5/2024 9:43 PM, T.Sato wrote:

On Fri, 5 Apr 2024 22:01:29 GMT,
   Brian Gregory  wrote:

  Hello and Happy Friday, I've got a sales guy telling me our 
120/240V EUT needs two pair of single-phase LISNs for our CE test 
bench.That's only slightly cheaper than a 3-phase unit at > 50A, but 
very bulky. Can someone remind me why I'd need 4, 50A single-phase 
LISNs for our unit?  I could see 3 (one for the neutral) but I'm not 
so savvy on EMC test equipment.
I think you can use either single 3-phase (usually 4 conductors + PE) 
LISN
or two single-phase (2 conductors + PE) LISNs whichever you like, 
although

I would prefer to use a single 3-phase LISN.

BTW, there maybe confusion with the term "single-phase LISNs" here.
Is it LISNs commonly used for single-phase AC supply?
Or is it LISNs for an single power supplying conductor?

Regards,
Tom

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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread Brent DeWitt
In my opinion, all of this is rather simple.  Any LISN, ANSI or CISPR, 
references the noise to "ground".  Any conductor not being measured 
should be terminated in 50 ohms.  Whatever network used needs to make 
that so.  Take your pick.


On 4/5/2024 9:43 PM, T.Sato wrote:

On Fri, 5 Apr 2024 22:01:29 GMT,
   Brian Gregory  wrote:


  Hello and Happy Friday, I've got a sales guy telling me our 120/240V EUT needs 
two pair of single-phase LISNs for our CE test bench.That's only slightly cheaper 
than a 3-phase unit at > 50A, but very bulky. Can someone remind me why I'd 
need 4, 50A single-phase LISNs for our unit?  I could see 3 (one for the neutral) 
but I'm not so savvy on EMC test equipment.

I think you can use either single 3-phase (usually 4 conductors + PE) LISN
or two single-phase (2 conductors + PE) LISNs whichever you like, although
I would prefer to use a single 3-phase LISN.

BTW, there maybe confusion with the term "single-phase LISNs" here.
Is it LISNs commonly used for single-phase AC supply?
Or is it LISNs for an single power supplying conductor?

Regards,
Tom

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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread T.Sato
On Fri, 5 Apr 2024 22:01:29 GMT,
  Brian Gregory  wrote:

>  Hello and Happy Friday, I've got a sales guy telling me our 120/240V EUT 
> needs two pair of single-phase LISNs for our CE test bench.That's only 
> slightly cheaper than a 3-phase unit at > 50A, but very bulky. Can someone 
> remind me why I'd need 4, 50A single-phase LISNs for our unit?  I could see 3 
> (one for the neutral) but I'm not so savvy on EMC test equipment.

I think you can use either single 3-phase (usually 4 conductors + PE) LISN
or two single-phase (2 conductors + PE) LISNs whichever you like, although
I would prefer to use a single 3-phase LISN.

BTW, there maybe confusion with the term "single-phase LISNs" here.
Is it LISNs commonly used for single-phase AC supply?
Or is it LISNs for an single power supplying conductor?

Regards,
Tom

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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread Lfresearch
The way I understand this is that if we are in the USA, then our 240 volts is 
likely Bi-Phase, not like Europe which has the Line swinging about the neutral 
by 240 volts. In that case you can use a V LISN, or two single phase LISN’s.

In the USA with a Bi-Phase you need 3 LISN’s. When I test these, I use a 3 
phase LISN rather than 3 individual LISN’s. It’s crazy to split the power cord 
to reach the mains terminal on each LISN.

Take care listening to sales guys….

My 10 cents,

Derek.

> On Apr 5, 2024, at 7:24 PM, Ken Javor  wrote:
> 
> I may be missing something here, but you would need a pair of LISNs for a box 
> that runs off a single phase and neutral.  Most equipments of which I am 
> aware use the same power connector pins whether 120 or 240 V. In that case, 
> you just need one pair of LISNs. If for some reason your box runs off both 
> 120 V and 240 simultaneously, then you would need two pairs of LISNs.
>  
> Current rating is whatever you need. I believe there are several 
> manufacturers offering models designed for up to 16 A. 
>  
> -- 
>  
> Ken Javor
> Ph: (256) 650-5261
>  
>  
>  Hello and Happy Friday,
>  
> I've got a sales guy telling me our 120/240V EUT needs two pair of 
> single-phase LISNs for our CE test bench.
> That's only slightly cheaper than a 3-phase unit at > 50A, but very bulky.
>  
> Can someone remind me why I'd need 4, 50A single-phase LISNs for our unit?  I 
> could see 3 (one for the neutral) but I'm not so savvy on EMC test equipment.
>  
> thanks, 
>  
> Colorado Brian 
> From: Brian Gregory  <mailto:brian_greg...@netzero.net>>
> Reply-To: Brian Gregory  <mailto:brian_greg...@netzero.net>>
> Date: Friday, April 5, 2024 at 5:01 PM
> To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG>>
> Subject: [PSES] Conducted emissions for Split-phase 120/240V needs 
> three-phase LISN?
>  
> This message is from the IEEE Product Safety Engineering Society emc-pstc 
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Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread Ken Javor
I may be missing something here, but you would need a pair of LISNs for a box 
that runs off a single phase and neutral.  Most equipments of which I am aware 
use the same power connector pins whether 120 or 240 V. In that case, you just 
need one pair of LISNs. If for some reason your box runs off both 120 V and 240 
simultaneously, then you would need two pairs of LISNs.

 

Current rating is whatever you need. I believe there are several manufacturers 
offering models designed for up to 16 A. 

 

-- 

 

Ken Javor

Ph: (256) 650-5261

 

 

 Hello and Happy Friday,

 

I've got a sales guy telling me our 120/240V EUT needs two pair of single-phase 
LISNs for our CE test bench.

That's only slightly cheaper than a 3-phase unit at > 50A, but very bulky.

 

Can someone remind me why I'd need 4, 50A single-phase LISNs for our unit?  I 
could see 3 (one for the neutral) but I'm not so savvy on EMC test equipment.

 

thanks, 

 

Colorado Brian 

From: Brian Gregory 
Reply-To: Brian Gregory 
Date: Friday, April 5, 2024 at 5:01 PM
To: 
Subject: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase 
LISN?

 

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[PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

2024-04-05 Thread Brian Gregory
 Hello and Happy Friday, I've got a sales guy telling me our 120/240V EUT needs 
two pair of single-phase LISNs for our CE test bench.That's only slightly 
cheaper than a 3-phase unit at > 50A, but very bulky. Can someone remind me why 
I'd need 4, 50A single-phase LISNs for our unit?  I could see 3 (one for the 
neutral) but I'm not so savvy on EMC test equipment. thanks,  Colorado Brian

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