View Single Post
Old 24th Jul 2017, 10:47 pm   #13
Craig Sawyers
Dekatron
 
Craig Sawyers's Avatar
 
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,941
Default Re: Home-brew 100:1 'scope probe.

A good read is the Tektronix Circuit Concepts and Measurement Concepts series, the vast majority of which are here http://w140.com/tekwiki/wiki/Concepts_Series

The particular ones of relevance are Oscilloscope Probe Circuits (in particular) and Probe Measurements.

But in a nutshell, the resistive core of the wire is there to provide electrical damping to prevent ringing. Also the resistance wire is very thin, and that reduces cable capacitance by a factor of 3 as compared with RG58.

But - since you aren't going to be really electrically stressing this probe, why not pay £10 - £20 and buy a Chinese Tek ripoff?

Craig

Last edited by Craig Sawyers; 24th Jul 2017 at 10:55 pm.
Craig Sawyers is offline