- Original Message -
From: Jim Ericson jde...@nas.com
To: vic.gibl...@raytheon.co.uk; emc-p...@majordomo.ieee.org
Cc: Harry Hodes hhho...@yahoo.com; James Ericson j...@acmetesting.com
Sent: Monday, February 25, 2002 2:46 PM
Subject: Re: ESD Generator confidence test
Hello Vic!
Hello Vic!
Verification of the 61000-4-2 ESD waveform requires some careful
engineering, no matter which approach you take. Basically, you need to
verify (among other things) the front-edge risetime, which is at (or
slightly below) 1 nanosecond. The harmonic content of the RF produced by an
Long time ago we found that the traces worked well as fuses when the
batteries were fully charged. However, when the batteries were mostly
discharged, the PC Board traces did not work well as fuses. At lower battery
charge levels, the traces became very hot and ignited the PC Board rather
than
Dear Group,
There is a big misunderstanding about verification, calibration, daily
check etc.
I am member of IEC TC77B WG-9 (ESD). We discussed what we want the user to do
and the present opinion is as follows (A new draft of the ESD standard will
reflect this position):
(1) Formal
Paolo,
My experience has been that if it is an Optical Isolation Circuit, the
actual RF isolation is usually far from desirable because of undesirable
capacitive coupling that occurs within the transmit and receive
circuitry.
I would suggest that you determine if undesirable coupling occurs
Floating grounds on PCBs tend to be problematic, especially at high
frequencies. Minimizing the effective capacitive reactance between the
floating ground and the real ground will ensure that the floating
ground is AC Cold. I don't just mean bypassing it with (say) a few
thousand uF of
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200202251628.iaa26...@epgc264.sdd.hp.com) about 'double-pole switching
and fusing', on Mon, 25 Feb 2002:
Hi John:
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200202202227.oaa19...@epgc264.sdd.hp.com) about
We looked at the unit and almost purchased one. However, we discovered the
annual cost to ship it back to Belgium + the calibration costs amounted to
almost 78% of the purchase price. It just was not economical. If someone
in the USA could calibrate it at lower cost it's a great product.
Hello again,
I learned this morning that when this message was sent last Friday, the
form for the Free Trial issue (covering CCC) was not working (although
it certainly appeared to be operational).
It is now functioning correctly. Sorry about that :-( Please resubmit if
you'd like a copy of
I read in !emc-pstc that Paolo Peruzzi paolo.peru...@esaote.com wrote
(in ofe539db9f.cfbf2fae-onc1256b6b.004b1...@esaote.com) about 'PCB
floating area layout', on Mon, 25 Feb 2002:
1) Is it best to minimize the HF capacitive coupling between the earthed
ground and the floating ground or to
I read in !emc-pstc that vic.gibl...@raytheon.co.uk wrote (in
off382fa56.4a8f1946-on80256b6b.004cd...@raytheon.co.uk) about 'ESD
Generator confidence test', on Mon, 25 Feb 2002:
The ESD standard IEC 61000-4-2 gives details for the manufacture of a
current target, used for verifying the ESD
Hi John:
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200202202227.oaa19...@epgc264.sdd.hp.com) about 'double-pole switching
and fusing', on Wed, 20 Feb 2002:
Tables 2E and 2F are invoked only by the Note 2
to Sub-clause 2.7.4.
A Note is informative,
Hi all,
I'm dealing with a PCB that has a floating section isolated from the rest
of the board for safety purposes (patient applied part).
I found out some problems with emissions, due to the coupling between the
floating part and of the PCB and the earthed one.
My questions are concerning the
The Curtis-Straus Update for February, 2002 is now available at:
http://www.conformity-update.com
The headlines are:
ACTA Adopts Technical Criteria For DSL Services.
Business Executive Appointed Head Of OET.
FDA Releases Revised List Of Recognized Standards.
OSHA To Step Up Enforcement In
Vic,
A couple of years back at the Seattle IEEE EMC show a go/ no go confidence
tester for static testing was discussed and demonstrated. I'm not sure if
that still is commercially available but if you email Ivan Hendrikx at
i...@hevrox.be he will be able to tell you more I'm sure.
Best
Hello!
I would like to confirm about the testing of FT/B(EN61000-4-4).
Do we need the synchronization test, although there is no description
which takes a synchronization about the phase angle of a power supply
according to the standard document?
Since the test is injected at every 300ms by a
Darrell,
Yes, we are also dealing with the AC 97 Codec. Our experience has been
that it produces RF Emissions, but I would say that both common mode and
differential mode noise contribute to the overall RF Emissions problem. I
don't believe that you will solve the Emissions problem with
The ESD standard IEC 61000-4-2 gives details for the manufacture of a
current target, used for verifying the ESD waveform.
I appreciate this could be used as a confidence check before administering
the test, but does anyone have another approach that they would be willing
to share.
Many thanks
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