3 May
2010
3 May
'10
6:59 a.m.
Hi
Replying to my own email here.
You might be able to get the right capacitance
by just running a piece of wire wrap wire along
the resistor. Just only attach it to one end of the
resistor. Like I said, the capacitance needed is
quite small.
Dwight
From: dkelvey at hotmail.com
Hi
I wouldn't call it improving the probe, it is more like
unimproving.
You'd need to add a capacitr across the resistor that
is inside of the probe tip. Not too easy to do with
most probes. Many older probes for old HP scope
would work. Also the Nicolet probes that I see on
ebay will also compensate to 30 pf.
The value of the capacitor is quite small. On the order
of 3 pf. 30/9
Dwight
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From: chrism3667 at yahoo.com
fine, but what do you have to do to improvise a probe.
the 2216 may have a 30pF capacitance IIRC.
> It means the input of the scope has 1 M resistance in
> parallel with 22 or 47 pF of capacitance. This means that a
> 10-1 probe for example would need to be adjustable to
> accomodate this input impedance. Probes are usually marked
> with what input capacitance range they can drive (The 1M
> resistance is standard for all high impedance probes)
>
> Peter Wallace
>
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