Compliance colleagues:
I am working with a Canadian customer who is exporting satellite
equipment to Europe. In reviewing the Mutual Recognition Agreement (MRA)
between Canada and the EC, I noted Norway, along with a couple of other
European countries do not indicate a designated authority for
Just to further muddy the waters:
During a previous life running a test house, we used yet another
interpretation. The highest fundamental was the highest frequency
brought out of any chip. If a separate VCO distributed 10x of the crystal
to other chips, 10x was the number. If the multiplier
Ah, you guys have about 10/15 years on me...
I remember the Motorola Quasar 'works in a drawer'. When they didnt work,
they were hard to fix..
Zenith had the motto 'the quality goes in before the name goes on'. They
really were pretty good.
RCA had the best chassis, but the grounds always
Thanks, Jack. This was my opinion as well, but I've heard and seen
others claiming just the opposite, In the case of my equipment we have a 125
MHz clock that is PLL'd up to 1.25Ghz for some optics. I have always tested
to 6.5 GHz, but even though it seems clear I've had dissenting
So far, I haven't seen anyone quote the actual wording in FCC Part 15. Here
it is, from the table in para. 15.33 (4).
Highest frequency generated or used in the device or
on which the device operates or tunes (MHz)
It doesn't appear to concern itself with *how* the signal is
In my experience, I have always used the highest clock generated within the
device!! i.e. if a 66MHz (external) clock is taken in to a processor and a PLL
then multiplies up by 8 the highest fundamental is 528MHz. The PLL circuitry is
generating a free running clock [with fast rise/fall edges]
Thank You so much Rich, Patricia, Mike, Jim, Ed, et al;
Please do continue to contribute your wisdom to this forum.
I spoke with my LES engineer and good friend at UL. [a good friend at UL is
a handy thing!]
Someday I should expound on the usefulness of proper care and feeding of
your agency
Rich,
Not really absurd given the quality of some of the board construction
materials I saw in those early days. For one thing, the materials did not
suffer heat well for very long (paper/phenolic?) - remember they were still
using tubes or later a mix of tubes semi's. I also worked in TV
Gary, Amund
We have always chosen the highest fundamental frequency as the highest
original frequency generated, normally a crystal or other oscillator.
Frequencies derived from the fundamental, via multipliers etc, are not
considered as fundamental.
John Harrington
RF Group Manager
Nemko
If the product contains mechanical devices such as disk, floppy, DVD etc and
has s/w
that has operation cycle times in the neighborhood of 1s or so then the 0.1 to
10 s
may have very different results at different points in that timing range.
--- Gary McInturff
Too bad they don't give the resonant frequency of such a device. It could
have interesting applications for university lectures. ( in the near
field ).
Ralph Cameron
EMC Consulting and Suppression of Consumer Electronics
(After sale)
- Original Message -
From: Price, Ed
Rich:
The reason Zenith was using the `hand wired' promo was the `cold' and
overheated PC boards especially the tube sockets that unsoldered themselves or
when the trace separated from the board. This takes me back to the creapage
point. I remember cutting away base board material, actually
ESD susceptibility has a couple of components. Simplistically,
don't let it happen or try to direct the energy where you want it, and does
the event happen at just the right (wrong?) time. Just as a critical gate is
changing states for example. Given the relative rate that modern
Amund,
My experience has been that the labs would prefer to perform the ESD
tests at a rate of 1 pulse/second (pps) for the sake of efficiency. If the
product passes then it was completed in the least amount of time and
everyone's happy. If the product fails at 1 pps, then you are
Does anyone have the text of article 27.4 of IEC 61558-1? That is the only
portion I
beed. Its a transformer standard and about a hot filament test?
Thanks in advance
=
Best Regards
Hans Mellberg
Regulatory Compliance EMC Design Services Consultant
By the Pacific Coast next to Silicon
Check in the Thomas Global Register.
http://www.tgrnet.com/ http://www.tgrnet.com/
Richard Woods
--
From: mkel...@es.com [SMTP:mkel...@es.com]
Sent: Thursday, August 02, 2001 11:12 AM
To: emc-p...@majordomo.ieee.org
Subject: Does anyone have
Hi Terry:
I don't recall the Sony but do recall the Philco and that Zenith held out
with the `hand wired' chassis.
Now that you mention it... I do indeed
recall that campaign. But, I did not --
then -- realize the context.
Today, looking back, that campaign was
really quite absurd!
Rich:
My resolution when we go that far back is +/- 5 years minimum :-) :-)
I don't recall the Sony but do recall the Philco and that Zenith held out with
the `hand wired' chassis.
Terry
Rich Nute ri...@sdd.hp.com 08/02/01 12:38PM
I saw the first PCB show up in TVs,
Would you
I saw the first PCB show up in TVs,
Would you care to put a date on that?
You can't change the facts. So yes! In the Middle to late 50's. :-)
Having been a TV serviceman until 1960 (end of
my college days), I saw no PCBs in USA TVs.
I do recall PCBs in circa 1963 TVs.
Group:
Check my interpretation of EN 61000-6-2:1999 Immunity DC power Port Table 3
Note 3. This is with reference to an industrial application with a DC power
input.
Intended to be either supplied with an AC-DC power supply (`power adapter') or
a distributed DC power from a distant AC-DC
Just to give you an idea of how we handled this in 60601-1-2, we said: The
time between discharges shall have an initial value of 1 s. Longer time
between discharges may be required in order to be able to distinguish
between a response caused by a single discharge and a response caused by a
You can't change the facts. So yes! In the Middle to late 50's. :-)
John Woodgate j...@jmwa.demon.co.uk 08/01/01 03:16PM
sb67c5fe@accusort.com, Terry Meck tjm...@accusort.com inimitably
wrote:
I saw the first PCB show up in TVs,
Would you care to put a date on that?
--
Regards, John
I'm looking for contact information for a company named Rendar in England
or for their rep or distributor in the U.S.
Thanks in Advance,
Max Kelson
Evans Sutherland
---
This message is from the IEEE EMC Society Product Safety
Technical Committee
Hello all,
If I remember correctly the one shot/second was to allow older simulators
time to recharge.
We believe that the probability of identifying an ESD susceptible product is
increased dramatically when subjecting the product to continuous discharges.
Ken Hall
Lonnie please file.
Interesting question and there is a corollary to it. If a crystal
oscillator is stepped up in frequency, with PLL circuitry for example, now
what is the highest frequency.
My current opinion is that for Amund's question it is the crystal
frequency, and to mine, it is the PLL
Please provide price and delivery for the following: 2 each 3871 DC PLISN
and/or 1 each 3874 1 to 10 GHz PLISN with ac adapter to
michael_r_mch...@raytheon.com.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc
Seems to me the time between discharges is the same as the time between
pulses (I believe that was the intent). I don't have the standard in front
of me, but I think the max rate was 1/second, which means you could go
slower. In most tests I've seen, the several discharges at one point are run
at
200108012153.oaa24...@epgc196.sdd.hp.com, Rich Nute ri...@sdd.hp.com
inimitably wrote:
My argument with the equipment class concept is
that few equipment are truly fit one of the
classes. I prefere to replace the word equipment
with the word circuit. Now, I can apply the
different class
We currently have a good process for collecting information from product
safety incidents in the field. We are now trying to develop a matrix which
lists which individuals in our organization should be involved. This
involvement should depend on the severity of the incident.
Types of
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