[time-nuts] [OT} audiophile outlets.....

dlewis6767 dlewis6767 at austin.rr.com
Wed Jun 19 04:29:02 EDT 2013


$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 at 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-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Didier Juges
> Sent: Tuesday, June 18, 2013 10:01 PM
> To: nerd at 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 <nerd at 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-bounces at febo.com [mailto:time-nuts-bounces at 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.YahooMailNeo at 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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> --
> Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other
> things.
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