TR : [Elecraft] Signal tracing with a scope

[Jean-François Ménard]

Answer I received that does not appear in the newsgroup. Thanks.

-----Message d'origine-----
De : elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] De la part de JEAN-FRANCOIS MENARD
Envoyé : 20 juin 2004 19:07
À : elecraft at mailman.qth.net
Objet : [Elecraft] Signal tracing with a scope


Ok..... I see that on my oscilloscope I can have the "True RMS readout 
(Vrms ac)".... is it the same thing as we get when we take a mesure 
using the RF probe that we built in the K2 kit ???

The RF probe that we built in the kit should convert RF into Vrms when 
we set the DMM in DC 20V-30V.... and in the "Signal tracing" chapter, 
we can take many readouts of certain part of the K2. With the RF probe 
using the DMM, I have correct values in the range that they mentioned, 
but using my scope for the same reading, the values are not same, even 
sometime not near of.

Maybe I missed something or maybe I mixed values and unit used... but 
"True RMS readout Vrms ac" is not the same as we get using the RF probe 
with a DMM ???

Or is there any conversion or formula I could use to have the correct 
answer using my scope ???

Thanks for your patience !!!

73


===============================================
Jean-François Ménard / VA2VYZ
va2vyz at rac.ca

Club d'Astronomie Amateur de Sherbrooke
Club Radio Amateur de l'Estrie

Mon site web personnel : http://homepage.mac.com/jfmenard
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