Re: Wattmeter

• To: tesla-at-pupman-dot-com
• Subject: Re: Wattmeter
• From: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sun, 24 Jan 1999 15:25:33 -0700
• Approved: twf-at-verinet-dot-com

  Steve -

  For the past 100 years coilers have been using voltmeters and ammeters to
measure the input watts to the Tesla coil. There is a lot of this info
available and the accuracy varies but probably averages about +/- 10%. Or
you can wait another 100 years for info to accumulate using electronic
wattmeters with a speculative +/- 1%.

  John Couture

----------------------------------



At 10:14 PM 1/23/99 -0700, you wrote:
>Original Poster: "Steve Young" <youngs-at-konnections-dot-com> 
>
>Recently, someone asked about the feasibility of using a watt-hour meter as
>a means of measuring wattage, but noone responded.  Suppose one uses a
>watt-hour meter of the type that is commonly used to bill us for our home
>power useage.  If one monitors just the TC HV transformer (pig, nst, pt)
>for a precise time such as 60 or 100 seconds, will one get a fairly
>accurate indication of average power?  Does mechanical inertia, etc. take
>care of the erratic waveforms it must handle?  I like the almost
>indestructable character of watt-hour meters--they seem to live forever.
>
>--Steve
>
> 
>
><SNIP>----------
>> An electronic
>> Wattmeter must take scaled samples of the voltage and the current in the
>> load, multiply them, average the result, and take the square root.
>> Any other approach will not work correctly with arbitrary waveforms.
>> 
>> Antonio Carlos M. de Queiroz
>> 
>> 
>> 
>
>
>

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