I think I can make NEC-2 work for this. It is a wire antenna modeling
program but I can make it do much more.
Dave
From: Robert A. Macy [mailto:m...@california.com]
Sent: Monday, October 08, 2007 3:34 PM
To: David Cuthbert
Cc: emc-p...@ieee.org
Subject: Re: RFI/EMI and Susceptibility on
David,
Thank you for your response.
It seemed counter intuitive that the second approach would
have less crosstalk than the first.
That expectation is based upon picturing the fields between
the two signal traces as better contained when the traces
were side by side on the same layer, than
Robert,
The second PCB stack-up will give less channel-to-channel crosstalk. Imagine
the stack-up with the ground traces on layers 2 and 3 removed. The coupling
of the layer 2 and layer 3 traces will be almost equal to the adjacent
channel. The ground stitching will help a lot. But you need to
Background
Trying to 'Engineer' the design of transmitting more than
eight balanced analog signals of very high quality over a
length of 30-40 cm using PCB structures that simulate
twinax cabling.
The signals themselves are energetic with bandwidth
exceeding 50MHz at levels more
Hi Bob:
Very nice discussion of the salient features
of the IT power distribution system.
Somewhat related to the original question,
should the product mains insulation requirements
be based on normal operation of the IT power
distribution system or based on the worst-case
fault of the
K -
Did you get a response to your question - I just found this in my spam
folder.
Regards
mark
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
kbalasubraman...@scmmicro.co.in
Sent: Tuesday, September 18, 2007 2:25 AM
To: ieee
Subject: RFID Modular FCC approval : Is shielding
Don,
I can put together a differential E-field probe for you that’s good to 100
kHz or so. Our Linear Technology LT1167 amp should be good for that. I’m
thinking the probes can be 1 cm square plates spaced 1 cm. Is that small
enough – can you go bigger? What field strengths are you looking to
http://www.wsbtv.com/news/14271878/detail.html
Searching on the Subject of this e-mail produces about 426,000 hits on
one search engine.
Not much detail on the few I looked at, other than to blame Li-ion
batteries and to say Apple is not talking.
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
Thanks Ari.
IEC 61000-4-5 Surge - I can't use the mains CDN (which is internal) due to
the limitations in the DC input (60VDC only). I am seriously looking into
direct injection.
IEC 61000-4-4 Transients - Agree. I will use the capacitive clamp method.
IEC 61000-4-6 Conducted RF - Based on the
://www.cnca.gov.cn/cnca/zwxx/ggxx/22071.shtml . The step-by-step
instruction, in Chinese, can be downloaded at
http://www.cnca.gov.cn/cnca/zwxx/ggxx/images/20071008/2769.doc
http://www.cnca.gov.cn/cnca/zwxx/ggxx/images/20071008/2769.doc.
Following is the unofficial translation of the instruction
Wendy,
here's some suggestions
IEC 61000-4-5 Surge: The product standard should define the current
limiting resistor, but in any case a coupling through a capacitor is
your choice. If no other instructions, use the mains coupler you have.
61000-4-4 fast transients: simply use the mains coupler
Dear All,
I have a simple product with only one AC input port and one dc output port.
According to its product standard, the dc output port must be subjected to
Conducted Immunity, Fast Transients and Surge tests. I would like to know how
to test dc output ports for the tests in question.
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