Olin Lathrop wrote:
>
> If this is a 10x probe for a existing scope with a known input impedence,
> then you can use the scope as the bottom half of the divider.  The input
> characteristics are usually marked on the scope.  For example the one on my
> bench says 1Mohm in parallel with 16pF.  In theory a 10x probe would
> threfore be 9Mohm and 1.8pF in parallel, all in series with the scope input.
> In practise it'll be rather more finniky than that, with the cable
> characteristics also taken into account.
>
>
> *

all well explained and arrived just after I clicked send on my post. I  
made mistake. I put 10M, which wrong, that would be 11:1

Anyhow if it suits your needs you can make a 2:1, 5:1 20:1 or 100:1, The 
main reason for 10x is that it's easy to move a decimal  point  rather  
than  divide  or multiply by 2
 
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