On Thu, 28 Jun 2001 05:32:16 -0000 "Billy Ward"
<billydeanward@hotmail.com> writes:
>
>[WC6W]
>The Bird 43 (without a peak reading module) is an average reading
>meter.
>
>[Billy]
>I thought that the Bird 43 was an RMS meter without the peak reading
>module.
> RMS and average are not the same?
>
>Billy
>
>_________________________________________________________________
Hi Billy,
No, they usually aren't.
For a sine wave, average voltage is equal to .9 * RMS voltage. The
factor is different for other waveshapes. Try figuring the numbers on a
triangle wave for... fun. :-)
The Bird scale is calibrated to read "power" (RMS voltage squared /
line R) even though it is driven by average voltage... accurate as long
as it is measuring a sine wave in a 50 ohm resistive system as Maury
noted.
73 & Good morning,
Marv WC6W
*
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|