--- On Tue, 12/2/08, Jim Eichner wrote:
>Amazing the spectrum you get when a really large 50kHz switching >fundamental
>slams into the transient limiter.
I remember reading a long time ago that when a transient limiter starts to
clamp, it becomes a comb generator. I ran into that recently when
Pat,
Thank you for that 'heads up'.
400 A/m is still around 1/2 mT, not the 2 mT I remember.
Interesting reference will now appear in the 'design'
documentation ...reference spec: 'internet'
I'm just trying to make certain that when the documents are
all here and we review my design versus sp
We also use a 140 kHz HP sharp cutoff filter as we have found 49 kHz
switchers overloading our fully compliant Rohde and Schwarz receivers. The
PSU manufacturers often use 49 kHz so that the third harmonic is below 150
kHz. I even know one that has a pot to adjust the switching frequency.
I am gu
As we often test immature prototypes with high emissions, I am quite
concerned about out-of-band emissions-related effects, and consider a
"real" preselector to be a mandatory part of any system we switch over
to. The manufacturers may be able to tell me that they solve the same
problem a differen
I notice Rohde and Schwarz have a new "low cost" ESL receiver. Unlike
previous "pre compliance" receivers it appears to be compliant to CISPR 16
even for the 1 Hz QP prf. However, it has no pre selection. I note the
recent comments about modern receivers having less sophisticated pre
selection. Thi
Dear Experts,
For the EFT / B testing for the noise is injected on the protective
earth conductor which will be the return path. In our USB device, signal
ground (- ve of 5 volts DC supply from the USB) and USB cable shield are
same points. USB cable shield is connected to chassis of the PC
Hi Robert,
3 A/m is indeed the test level called out in IEC 60601-1-2, the standard
used for general medical EMC testing.
However, there are many other medical safety standards in the IEC
60601-2-* series which may have different test levels. My favorite is IEC
60601-2-24:1998, which calls ou
> -Original Message-
> From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf
> Of Jim Eichner
> Sent: Tuesday, December 02, 2008 12:03 AM
> To: emc-p...@ieee.org
> Subject: RE: EMI Receiver
>
> Indeed, however while I too may be losing the will to live, I
> still have the will to
Indeed, however while I too may be losing the will to live, I still have
the will to search out a new spectrum analyzer (note I learn from my
experiences and have dropped the term-that-shall-remain-unspoken from
this posting).
So dare I repeat my question and that of Tim's original posting: does
Brodie,
Thank you very much for your informative reply.
3 A/m translates to 3.8 microTeslas, correct?
10 A/m would then be 12.6 uT
That is indeed benign. For some reason 2 mT had stuck in
my mind and that would have been hard to deal with,
requiring a block diagram change during prototype desig
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