Hi You should measure the peak to peak voltage divide by 2 and then divide by the square root of 2. A quicker way is to multiply the peak to peak reading by .3535. The conversion only works for sine waves. It will not be correct for digital signals, square waves, pulses or just about anything but sine waves. Many DVMs can measure true RMS on non sine wave signals but the upper frequency limit on DVMs is usually in the audio range. The RF probe detects the RF and converts it to a DC equivalent of the RMS voltage so it can be read on a DVM. The RF probe is also only accurate on sine waves so if you are comparing readings made with a RF probe to readings made with a scope and converted to RMS they will only match on sine waves.
Don Brown KD5NDB ----- Original Message ----- From: GS<mailto:[EMAIL PROTECTED]> To: Mailingliste Elecraft<mailto:[email protected]> Sent: Wednesday, June 23, 2004 7:30 AM Subject: [Elecraft] Vrms measurements with oscilloscope Hi, if I signal trace with my oscilloscope and want to know the Vrms values at certain points in my K2... ... is ist correct to measure the amplitude (not peak to peak) of the signal and then divide by the square root of 2? Will I get values I can check against the given Vrms values in the manual? Thanks Gerhard ___________________________________________________________ Bestellen Sie Y! DSL und erhalten Sie die AVM "FritzBox SL" für 0?. Sie sparen 119? und bekommen 2 Monate Grundgebührbefreiung. http://de.adsl.yahoo.com<http://de.adsl.yahoo.com/> _______________________________________________ Elecraft mailing list Post to: [email protected]<mailto:[email protected]> http://mailman.qth.net/mailman/listinfo/elecraft<http://mailman.qth.net/mailman/listinfo/elecraft> You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm<http://mailman.qth.net/subscribershtm> Elecraft page: http://www.elecraft.com<http://www.elecraft.com/> _______________________________________________ Elecraft mailing list Post to: [email protected] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
