I hesitate to remind you all, but if anyone has a problem
interpreting the requirements of IEC 60950, there is
the TC74 Chairman's Advisory Panel.
Briefly, the procedure is as follows :
Questions for interpretation should, as a minimum
- define the problem, making reference to a specific
95fbd8b0830ed511b7720002a51363f1319...@exw-ks.ks.lsil.com, Ehler, Kyle
keh...@lsil.com inimitably wrote:
Ah yes, the blissful aroma of hot tubes, ozone and fried flybacks..those
were the days..
Didn't you have selenium rectifiers, too.? Inhaling selenium dioxide in
small amounts can be
sb695074@accusort.com, Terry Meck tjm...@accusort.com inimitably
wrote:
I don't recall the Sony but do recall the Philco and that Zenith held out with
the `hand wired' chassis.
ITT-KB went back to 'hand-wired' as a marketing point in 1963 (IIRC),
because of overheating problems with the
sb69402e@accusort.com, Terry Meck tjm...@accusort.com inimitably
wrote:
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
, ozone and fried flybacks..those
were the days..
I was sooo good that I retired after 10 months..
-kyle =:)
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Thursday, August 02, 2001 12:45 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: Creepage dist. for more than
shops
during school and can remember thoroughly cooked PCB materials.
Regards,
Jack
Xerox EMC
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Thursday, August 02, 2001 10:45 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Creepage dist. for more than 1000V ?
Hi Terry
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
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.
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
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 Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
This message and its contents are not confidential, privileged
Rich:
As always I appreciated your eloquent explanation of the concept of the
creapage requirement. Unfortunately experience has taught me long before your
email.
My question was based on the fact the standard does not SEEM to address the
larger creapage distance 1000 volts. My reasoning
Rich,
Interesting info about how arcs form across PCBs, wish I had knew this a few
years back. In this case I had a situation where PSUs were being taken down by
fabric form ESD coats. The general non conductive cotton and polyester was
settling between comports
and an occasional, very
Terry Meck wrote:
Hi Rich:
I thought the lack of creapage spec. at 1000 V is that the
dielectric
strength of air would be less then the insulating material and
surface
accumulated contaminates. As a result the clearance distance would
be the first to break down 1000 Volts.
Am I wrong?
Hi Rich:
I thought the lack of creapage spec. at 1000 V is that the dielectric strength
of air would be less then the insulating material and surface accumulated
contaminates. As a result the clearance distance would be the first to break
down 1000 Volts.
Am I wrong?
Best regards,
Terry
000601c11881$36e04600$1e44d1d1@stella, Vygovsky, Yury
edes...@inreach.com inimitably wrote:
By interpolation the creepage for 1500v = 15mm or more, for 2000v=20mm or
more.
No, that would be extrapolation, and the standard doesn't say you can do
that.
--
Regards, John Woodgate, OOO - Own
By interpolation the creepage for 1500v = 15mm or more, for 2000v=20mm or
more.
Yuriy Vygovskiy
ENGINEERING DESIGN COMPLIANCE
-Original Message-
From: Israel Yeshurun israel_yeshu...@creoscitex.com
To: 'emc-p...@majordomo.ieee.org' emc-p...@majordomo.ieee.org
List-Post:
f49eb2d9f324d511bfc30008c7860394191...@csilex01.stil.scitex.com,
Israel Yeshurun israel_yeshu...@creoscitex.com inimitably wrote:
I wonder how to specify creepage distance for Information Technology
Equipment.Table 6 in UL1950 or EN60950 specifies minimum creepage of
10 mm for Working
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