EMC Colleagues
Has anyone had experience with using radius or rounding on high speed traces
as opposed to chamfered 45 degree corners? Is there any real benefit for 1-5
nS rise time clock? I don’t think there is but maybe some may have other
views.
Thanks
Darrell Locke
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-Original Message-
From: John Harrington [mailto:jharring...@f2labs.com]
Sent: Monday, May 05, 2003 7:44 AM
To: 'emc-p...@majordomo.ieee.org'
Subject: ELF (E and H) survey equipment
Does anyone know where I might be able to rent (and failing
that purchase)
some E and H field survey
Chris,
Most MOVs are rated as 'Y' components. The manufacturer should be able to
point you towards the appropriate agency information. You should also be
concerned about the overvoltage affects of MOVs. Without some sort of
thermal protection these devices can be very destructive. But, you
I can probably shed some light into this subject as I am the original
designer of the Pelligrini target.In 1978/1979 I designed the coaxial
target for waveform verification as our client, Dave Reynolds of Digital
Equipment Corp., insisted on certain waveform adherence from our company
John:
I faced the same problem about six years ago. I needed to do verification
in between the expensive annual calibrations. I first explored the option
of buying a Pelligrini Target. As I recall, the quotes I received were
around $2000. That seemed outrageous, so I decided to build one
I read in !emc-pstc that Jim Ericson jde...@nas.com wrote (in
004001c31052$499e9c40$83663fce@pavilion) about 'ESD gun verification'
on Thu, 1 May 2003:
Be aware how important the POSITION of the ESD Gun Grounding Strap is
to these measurements ... especially to risetime measurements. I always
All,
It seems that I could possibly pass the testing with a suppression device
between Line and Chassis (probably from Neutral to chassis as well).
Some experiments with TVS diodes that I have on hand have been promising.
However, the diodes can't stand up to the multiple surges. i.e. I get
I read in !emc-pstc that John Harrington jharring...@f2labs.com wrote
(in 5777c7d14a69d411be4200a0cc746898493...@exchange.f2labs.com) about
'ESD gun verification' on Thu, 1 May 2003:
Does any one have a quick and dirty (and hopefully cheap) way to verify the
performance of an ESD gun.
It's a
Jim,
the Pelligrini Target spec in EN61000-4-2 is quite a challenge to meet. The 1
dB insertion loss delta from DC to 4 GHz to be exact. The simulation of my
proposed PCB design shows that it can meet the spec and I have the equipment
to verify this.
I will build a few targets. Perhaps a few of
I read in !emc-pstc that Ravinder Ajmani ajm...@us.ibm.com wrote (in
of3726dba3.c9d3514a-on88256d19.007dd66b-88256d19.00802...@us.ibm.com)
about 'ESD failure' on Thu, 1 May 2003:
Any suggestions on what I should I try next.
A grounded shield over the ASIC? It's being zapped by radiated energy,
There's plenty of references on the web. Here's one from Berquist.
Best let you read it than me putting my own spin on it.
http://www.bergquistcompany.com/tm_thermal_prop.cfm
Regards, Doug McKean
_
MSN 8 helps eliminate e-mail
RE:
Greetings All,
Does someone in the group have an idea if the document TSB31-B (February 1998
Issue), Part 68 Rationale and Measurement Guidelines, will be updated to cross
reference to the TIA standard, TIA-968-A, Technical Requirements of Terminal
Equipment of the Telephone Network? Since
John:
I faced the same problem about six years ago. I needed to do verification
in between the expensive annual calibrations. I first explored the option
of buying a Pelligrini Target. As I recall, the quotes I received were
around $2000. That seemed outrageous, so I decided to build one
Quite the opposite. Compliance testing can only be done on the final
production model. This obviously places compliance testing at the end of the
pipeline. It is questionable, to say the least, to issue a DOC prior to
final testing, so the DOC is not available till after final compliance
Hi Ravinder!
Really need more details to comment in detail. Consider the following,
though:
1.Contact Discharge to the Horizontal Coupling Plane produces a large
bloom of (mainly H-Field) radiation underneath the EUT. Could be on the
order of 200 Volts/metre, depending on the spacing.
Does anyone know where I might be able to rent (and failing that purchase)
some E and H field survey eqipment? I need it to range from sub 1Hz to
10kHz, to read E and H fields separately, and to be portable.
Thanks
John Harrington
EMC Technical Manager
F-Squared Laboratories
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