$349.00 for a power strip made in China.
And my wife calls me crazy for having so many scopes.
-Don
==========================================================================================
-----Original Message-----
From: Peter Gottlieb
Sent: Tuesday, June 18, 2013 9:46 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] [OT} audiophile outlets.....
Simple, just think of the next snake oil. There's always more.
On 6/18/2013 10:33 PM, Brian, WA1ZMS wrote:
What's gets me is that I didn't think of this snake oil first.
Had I thought of it first I could own a PTI H-MASER by now. :- )
-Brian, WA1ZMS
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Didier Juges
Sent: Tuesday, June 18, 2013 10:01 PM
To: n...@verizon.net; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP and other equipment failure
"audiophile outlets"
You've got to be kidding but not even.
At least, nobody is forcing anybody to buy them...
Didier
Peter Gottlieb <n...@verizon.net> wrote:
The current distortion from simple transformer-rectifier-capacitor
power supplies contains a lot of third harmonic content. In a 3 phase
system (as are all distribution systems for commercial and industrial)
the third harmonic ADDS in the neutral, or creates circulating currents
in a delta configuration. These currents, as you mention, can get very
large and were the cause of many
transformer explosions in cities as these power supplies became common.
The
transformer designs had to be improved, but the PFC supplies make a big
difference.
How many of you have looked at the power line waveform, especially in
an industrial or commercial area? Doesn't look much like a sine wave,
does it? So it's pretty funny to see audiophile outlets
(http://www.dedicatedaudio.com/power_outlets).
Peter
On 6/15/2013 6:56 PM, stan, W1LE wrote:
PFC to me is power factor correction, not only the classical power
factor to
minimize (VAR) volt-amp reactive component, but also to remove the
harmonic load current imposd on the
electrical power
system.
A '90's onward technique. in th 80's and 90's without the harmonic
load
current reduction and having
a few 100 end items of equipment, each withtheir own a switch mode
power
supplly,
it was not uncommon to find hundreds of amps of the third harmonc on
neutra,
in the electrical power distribution system.
Could be a serious EMC problem if you were dealing with voice grade
channels.
And people safety issues.
Stan, W1LE Cape Cod
On 15-Jun-13 5:52 PM, J. L. Trantham wrote:
Sorry for the interruption but what is 'PFC'?
Thanks.
Joe
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
On
Behalf Of Poul-Henning Kamp
Sent: Saturday, June 15, 2013 4:09 PM
To: Robert Atkinson; Discussion of precise time and frequency
measurement
Cc: Perry Sandeen
Subject: Re: [time-nuts] HP and other equipment failure
In message
<1371329221.83869.yahoomail...@web171902.mail.ir2.yahoo.com>,
Robert Atkinson writes:
While I agree with everything else you say, you CAN have too much
filter capacitance. At least where dc rectifier / filter
(smoothing)
circuits are concerned. Increasing C causes increased ripple
current
[...]
And ripple current can be a major source of power-line frequency
noise in
all electronics.
The main reason why switchmode power-supplies today (can) outperform
linear
power supplies with respect to noise, is because the legally
mandated PFC
correction eliminates the bridge-rectifier ripple harmonics.
I would not hessitate to use a good quality switchmode to replace
the linear
supply in a HP5370B.
I did some experiments a couple of years ago, with an
audio-amplifier:
I put a standard PFC corrector chip on the secondary side of the
trafo.
The overall result was not satisfactory, but the 50 Hz "sneer"
we all know and hate was absent, and the "Tzoing!!!!!" power-on
mechanical
shock from the trafo was also eliminated, as was the consequent
dimming of
the lights ;-)
The main reason not to do this, is that you need some physically
gargantuan
coils for a 10A+ PFC-switcher.
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things.
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