# LISN

T

#### Terry Given

Jan 1, 1970
0
Hi All,

I need to get a (cheap) 230V <= 16A LISN, to do some pre-compliance
tests. Any ideas where? doesnt have to be new, I just dont want to have
to roll my own.

Cheers
Terry

P

#### Paul Mathews

Jan 1, 1970
0
Hi All,

I need to get a (cheap) 230V <= 16A LISN, to do some pre-compliance
tests. Any ideas where? doesnt have to be new, I just dont want to have
to roll my own.

Cheers
Terry

They very occasionally turn up on auction sites and usually go for
good money. However, making your own can be easy and quick. Try
googling for Keith Armstrong's EMI pages, Cherry Clough Associates. He
gives construction details for a very nice unit. Also recommended: add
a Common Mode Diff Mode splitter, easily made from a pulse
transformer.
Paul Mathews

E

#### Eeyore

Jan 1, 1970
0
Terry said:
I need to get a (cheap) 230V <= 16A LISN, to do some pre-compliance
tests. Any ideas where? doesnt have to be new, I just dont want to have
to roll my own.

I did once see a circuit for one. Probably in an IEC document. It didn't look
that tricky.

Graham

B

#### Barry Lennox

Jan 1, 1970
0
They very occasionally turn up on auction sites and usually go for
good money. However, making your own can be easy and quick. Try
googling for Keith Armstrong's EMI pages, Cherry Clough Associates. He
gives construction details for a very nice unit. Also recommended: add
a Common Mode Diff Mode splitter, easily made from a pulse
transformer.
Paul Mathews

I built one from Keith Armstrong's EMI pages, I believe it's an exact
copy out of EN 6xxxxx something. Anyway, they are pretty simple and
it works well enough, I cannot see any difference between it's
performance and a $commercial unit. Barry T #### Terry Given Jan 1, 1970 0 Barry said: I built one from Keith Armstrong's EMI pages, I believe it's an exact copy out of EN 6xxxxx something. Anyway, they are pretty simple and it works well enough, I cannot see any difference between it's performance and a $ commercial unit.

Barry

Thanks for the pointers. I've been googling, but havent found the
relevant bits yet (and my f*****g internet connection is playing up
again). Do you have a link?

Cheers
Terry

T

#### Terry Given

Jan 1, 1970
0
Terry said:

Right, thats the DIY LISN built then. 30m of 4mm^2 wire cost twice as
much as the steel enclosure, which I bought from RS!

and FWIW I'm not making a DIY CM & DM splitter - I will use a couple of
combiners/splitters from minicircuits:

ZMSC-2-2 0 degrees
ZMSCJ-2-2 180 degrees

much better response, and they are about US$60 each. thanks once more for the link. Cheers Terry P #### Paul Mathews Jan 1, 1970 0 Right, thats the DIY LISN built then. 30m of 4mm^2 wire cost twice as much as the steel enclosure, which I bought from RS! and FWIW I'm not making a DIY CM & DM splitter - I will use a couple of combiners/splitters from minicircuits: ZMSC-2-2 0 degrees ZMSCJ-2-2 180 degrees much better response, and they are about US$60 each.

thanks once more for the link.

Cheers
Terry- Hide quoted text -

- Show quoted text -
For DM/CM splitter, the first time, I used same Minicircuits modules
you identified. Very good. 2nd time around, I used the equivalent
Minicircuits circuit board mount modules. Same performance at about
1/3 the cost. Third time, I used a Pulse Engrg gate drive transformer:
slightly better performance at 1/6th the cost.
Paul Mathews

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#### Barry Lennox

Jan 1, 1970
0
On 15 Mar 2007 07:49:26 -0700, "Paul Mathews" <[email protected]>
wrote:

--snip

If you get stuck, I have all the Cherry Clough articles on a DVD from
one of their seminars. I can email you the article.

---snip
For DM/CM splitter, the first time, I used same Minicircuits modules
you identified. Very good. 2nd time around, I used the equivalent
Minicircuits circuit board mount modules. Same performance at about
1/3 the cost. Third time, I used a Pulse Engrg gate drive transformer:
slightly better performance at 1/6th the cost.
Paul Mathews

Aha, Interesting, what was the part no of the PE transfomer you used?

Barry