>
>measures wrote:
>>>>> ? RMS is equivalent DC heating ability. For example, with a
>>>>> sine-wave,
>>>>> 200w-pk would have the heating ability of 100DC watts. .
>>>>>
>>>>>This "200w-pk" is a peak instantaneous power. Peak instantaneous power
>>>>>is a notion with very little physical meaning, and no practical use.
>>>>>Ignore it - its only power is to confuse.
>>>>>
>>>>This is essentially how the FCC measures PEP.
>>>
>>>I cannot believe that.
>>>
>> I realize this, Ian.
>>
>>With a 50-ohm load, 387.3v-peak indicates 1500w PEP on the wattmeters the
>>FCC uses.
>
>Yes, obviously. There is nothing wrong with that "v-pk" calculation.
>
>What I cannot believe is that the FCC make any use of the quantity that
>you call "w-pk".
>
They don't call it that, but this is essentially how one calibrates such
a meter. When one measures 387.3v-pk across a 50-ohm load with an
NBS-traceable oscilloscope and multiplier-probe, the "PEP" meter is adj.
to read 1500w.
cheers, Ian.
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|