The important effect of the length of power cables between test sample and
LISN is not decoupling, but vswr. Once the cable approaches a quarter
wavelength, the test sample doesn’t see the LISN anymore; it sees the
impedance of the cable as a mismatched transmission line. That is the reason
for
Some standards have asked LISN’s to be used up through 150 MHz. While you
are modeling the impedance at the EUT port of the LISN, you should also think
about what a meter or two of cable between the LISN and the EUT does.
True, most standards have ignored this, simply defining what impedance
In a message dated 4/8/2010 5:57:05 P.M. Pacific Daylight Time,
americo...@aol.com writes:
If you use EE101 on the LISN it can be seen that at 10 KHz it has an
impedance of about 5 ohms. At 30 MHz its impedance is about 9.42 Kohms in
that the 250 micro henry inductor is
Umm, no, you give me too much credit. I was merely pointing out that above
150 kHz, the LISN impedance curve is indeed modeled to a very high degree of
accuracy by 50 uH in parallel with 50 Ohms, as a previous post stated. The
degree of accuracy being to the nearest 0.1 Ohm at 150 kHz, and getting
Good day folks,
I'm trying to interpret the requirements of EN 61326 for EFT.
Specifically the application of the pulses. Does the standard require
all combination's of pulses, or are we talking applying the pulses such
as L1 to GRP, L2 to GRP and L1+L2 to GRP. Is the PE ever tested?
Just
Thanks, Ken.
You picked up on the effect that using different LISNs may have on the
measurement of conducted noise as seen at the spectrum analyzer. That is,
measurement of noise generated by the internals of the SMPS 'kicking' back
onto the lines.
Regards,
Robert Macy, PE
AJM Electronics
101
I do not think such a source exists.
In general:
Products need to be ce-marked according to the regulations valid on:
“date of putting on the market” OR,
“date of putting into service” , if (1) is not applicable.
“Parts” that have an intrinsic function to the end user
(and bad
Mr. Macy is exactly right if you need LISN impedance correct to 0.01 Ohm.
For the rest of us, calculating 50 Ohms in parallel with 50 uH is within 0.1
Ohm of the correct value from 150 kHz up. And you don't need sophisticated
modeling. You can use a simple spreadsheet.
Ken Javor
Phone: (256)
Each line (phase and neutral) sees 50 Ohms in parallel with 50 uH, but the
power port sees a differential impedance of 100 uH in parallel with 100 Ohms,
and a common mode impedance of 25 uH in parallel with 25 Ohms.
Ken Javor
Phone: (256) 650-5261
From:
Gary I am familiar with the lock mechanism you are referring. John is
correct, it is a poor design. They have traded off the convenience of
the snap in 9 V battery to do a job it was never intended to do,
activate a solenoid. However it is not entirely the manufacturer's fault.
In this day
NO!
You can use free tools to find the impedance vs freq, like LTspice or Tina
These models are close:
be sure to include line cord [a three winding transformer] and the set up
[GND planes provide weird capacitances to the EUT] I've gotten these to
be fairly accurate predicting how well the
In message
d500012385dca64883637ab4ccf491e3016b2...@ms-cda-02.advanced-input.com,
dated Thu, 8 Apr 2010, McInturff, Gary gary.mcintu...@esterline.com
writes:
I think car batteries have an additional rating of cranking amps is
there something similar on 9 volt batteries? What?s the root cause
Thank you all. I feel better now; knowledge is often comforting.
Would it be correct to say that the EUT power port 'sees' an impedance of
approx 50 ohms in parallel with the reactance of the inductance used in the
LISN?
Had a mechanical engineer stop me in the hallway yesterday with an interesting
question about a 9 volt battery. He has an electronic safe that wouldn’t
open. It wouldn’t release the locking bar after the proper code was entered.
He went out and bought a famous brand of battery and replaced the old
Hello Group,
What is the effect of the 2nd Edition of EN60950 on replacement parts for
systems which are no longer in production?
Scenario A:
A system is certified to the 1st Edition only and installed in an EU country.
This particular system has a failure and needs a part replaced such
Hi Tim
The user manual being Japanese isn't really a problem, the preselector
developed a fault so I sent it to a company in NJ called Alltest for repair.
In the past they've been really good fixing Advantest stuff but in this case
they're stuck for the schematic to fault find it. Unfortunately
We might also note that the drop in impedance as the frequency lowers is
somewhat a necessity.
Otherwise, operating an AC powered device through a LISN might be less than
useful/functional.
- Bill
In the event of a national emergency, click on the following links to provide
directions to your
Sorry for being a little off topic but I'm looking for the schematic for an
Advantest Preselector R3553. I've been able to download the user manual in
Japanese off the Advantest Japan website but am unable to find any
service/schematic information.
I'm guessing we're not the only EMC lab using the
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
ralph.mcdiar...@ca.schneider-electric.com
Sent: Wednesday, April 07, 2010 6:51 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: 50 ohm LISN (AMN)
Two academic questions for the group:
1. When we say '50uH/50 ohm LISN' are
It is still available David, and they recently changed the format so that the
entire text of Part 15 is available as a single pdf. Go to www.fcc.gov and
scroll down the left sidebar to the rules regulations link. Follow that
through a few clicks and you have it.
Respectfully,
Brent DeWitt
In message ptdxcncv9xvlf...@jmwa.demon.co.uk, dated Thu, 8 Apr 2010,
John Woodgate j...@jmwa.demon.co.uk writes:
In message
OFC571B2FE.A2F9F043-ON882576FF.000541D6-882576FF.000A02FC@US.Schneider-E
lectric.com, dated Wed, 7 Apr 2010,
ralph.mcdiar...@ca.schneider-electric.com writes:
Two
In message
OFC571B2FE.A2F9F043-ON882576FF.000541D6-882576FF.000A02FC@US.Schneider-E
lectric.com, dated Wed, 7 Apr 2010,
ralph.mcdiar...@ca.schneider-electric.com writes:
Two academic questions for the group:
1.When we say '50uH/50 ohm LISN' are we referring to a device which
provides a source
David,
http://globalcompliance.blogspot.com/se
rch/label/United%20States%20of%20America
The GPO access is the correct place to access the FCC docs (see above link)
Best Regards,
Peter Merguerian
President
Go Global Compliance Inc.
pe...@goglobalcompliance.com
Hi everyone,
Once upon a time Part 15 was readily available in pdf format via the FCC web
site and the FCC updated it every couple of months.
The last time that I could find that this was available was in July 2008.
At the present time I can only find Part 15 via GPO Access and there seems to
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