[sdiy] yard sale find

[John L Marshall]

----- Original Message -----
From: "Theo" <t.hogers at home.nl>
To: "gavin" <elmystico at earthlink.net>; "synth" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, July 29, 2002 1:12 PM
Subject: Re: [sdiy] yard sale find

> As long you don't work with high voltages you don't need a 10x probe.
> A normal 1X probe is just a shielded wire, nothing special really.
<snip>

The primary purpose of a 10X probe is not for working with high voltages,
but rather to work with sensitive circuits. A 1X probe will have an
impedance of only 1 Megohm plus the capacitance of the coaxial cable. A 10X
probe will have 10 Megohm resistance with 1/10 the capacitance.

If all you are using the scope for is to observe signals between modules
then a 1X is fine. But.

Want to look at the integrating capacitor on a VCO? Even the 10X probe will
influence the circuit.

Take care,
John
---------------------------------------------------------------------------
Pacific Northwest DIY Synthesizer meeting, July 20, 2002
See: www.sound-photo.com
---------------------------------------------------------------------------