Obtaining accurate high freeq measurements with oscilloscope

Hello,

I wish to measure circuits at high frequencues (~10-30 MHz), I was wondeirng if anyone could possibly outline a method of accurately measuring the input impedance & capacitance of an oscilloscope probe so i can have some confidence in the measurments I take.

How can i cancel out the impedance/capacitance effect on the circuit i am measuring?


Also
The oscilloscope I have has an input impedance of 1 MegOhm and 20 pico farad, the probes i have can compensate the capacitance. Appareantly the probes can work upto 200MHz

I have a function generator set to 10MHz square wave, when i measure the result with the oscilloscope there is no sqaure wave at all, its practially a sine wive, which is very poor. I have tried using the probe trimmier but this does not help.

What can i do to ensure good high frequency measurement?

Which probe do people recommend I should use?


Sorry for the stupid questions, but if i don't ask, i don't learn



Regards

Cat

Re: Obtaining accurate high freeq measurements with oscillos

Maybe you can refer to teK oscilloscope site for some application note reading

here's some app notes


For the 10 Mhz type of measurement, i think you might need to use some 50 Ohm match impedance probe

Re: Obtaining accurate high freeq measurements with oscillos

Should i even be using an oscilloscope for such high frequencues? what alternatives are there?

Thanks