4 May
2010
4 May
'10
12:50 p.m.
On Saturday 01 May 2010 03:36:59 pm Chris M wrote:
More precisely, the input _resistance_ is 1MOhm. The impediance is
frequency-dependant, and appears to be a 1M resistor in parallel with a
22pF capacitor (or whatever). At high frequencies, that may well be a lot
less than 1MOhm.
-tony
I happen to have a probe I picked up from
somewhere in my garbage
garage. The inputs on these 2 scopes require 1Mohm wit
either 22pF or 47
pF of capacitance.
No...
What does this mean? There's simply a
capacitor between the coax?
The resistance part is strait forward presumably. If
that's the case,
then you can just jury rig an acceptable probe, no?
It means that the input impedance of that connector is 1 Mohm. And
that it has the equivalent of 22-47pF of capacitance across it. The