Author Topic: Bandwidth check of my oscilloscope with simple means ?  (Read 2121 times)

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Offline David Hess

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Re: Bandwidth check of my oscilloscope with simple means ?
« Reply #50 on: December 11, 2020, 10:00:50 pm »
One thing to keep in mind when testing probes like this is that at high frequency the >10pF of probe capacitance starts to really matter and can drag down a 50 Ohm source, but up to 100MHz it's still pretty reasonable.

15pF at 100MHz is ~100ohms. So much for such a probe being "high impedance 10Mohm"!

Indeed, probe bandwidth is specified with a 25 ohm source impedance and a coaxial connection to the probe tip, which is unrealistic for most real world usage up to 100 or even 200 MHz because of the inconvenience.
 


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