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Date: Tue, 24 Dec 2002 15:46:38 +0100
From: Rene Tschaggelar
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Subject: Re: RF voltmeters
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Paul Burridge wrote:
> Given the difficulty I experienced measuring RF voltage levels using a
> 'scope (given the loading effect of the probe and/or scope itself)
> I've been pondering making up an RF probe for my DVM in the hope of
> getting more accurate readings of RF voltages. Does anyone have a view
> on whether this option would prove less troublesome than using a
> 'scope alone?
The input range of the scope is rather limited.
Meaning there isn't any accuracy in signals below 10mVpp (-36dBm)
and the upper end ist probably at 15Vpp (27dBm=0.5W) due to the
power rating of the internal termination.
A wide range option with bandwidths up too 500MHz is a logamp,
they're doing 90dB or even more.
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
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