Hi. I need to extend the probes about 2 meters. Does anyone have any advice on how to achieve the best result.
I'm thinking about Coax - but what type (impedance) should I choose. And what about a terminator for the cable.
The object to test, is running at about 10 - 20MhZ (5V).
Any advice is appreciated.
/Bo
Conventional scope probes are not designed to be extended.
At 10 to 20MHz, you would be better off making your own 20:1 cable with a 1K input impedance. A 15pF x10 scope probe at 20MHz has an input impedance of 500 ohms, and a homemade 1K probe may actually work much better. probably better risetime.
The cable is a good quality 50 ohm cable - whatever length you need - terminated with 50 ohms at the scope end. At the sensor end, you have a 950 ohm SMD resisistor in series with the inner core of the cable.