Joerg a écrit :
Fred_Bartoli wrote:


[...]

How much is the scope probe capacitance consuming ?:-)


Hey, this is a brand new 200MHz scope that came with four spanking
new high speed probes :-D


Joerg,
you probably already checked it but just in case...
I've bought some of the cheap chinease 1/1:10 scope probe for slow 1:1
probing. That's perfectly OK for that. Now, to once do a quick circuit
check I flipped it to the 1:10 mode and scratched my head for the bad
results of my circuit for maybe an hour...
... until I noticed that the 1:10 attenuation was of by more than 20%.
Not AC response, but DC. What a crap!

Now I believe it's fortunate they got the 1:1 ratio right :-)


When the scope came that's one of the first things I checked. Took the
fast pulse generator. To my amazement they had even adjusted the
compensation very close to perfect.


Yep, pulse shape was OK too (for the price). But who would think of
testing DC attenutation? Now I do...

--
Thanks,
Fred.