Rise time measurements counter/timer vs Oscope?

Hi,

I am trying to measure the rise time of a 10 MHz square wave with a Keysight 53220A universal counter. The source has a specified rise time at 10 MHz of <3 nS. This is confirmed to be about 3 nS when measured on a scope.

However, when measured on the counter I am seeing a rise time of around 40 nS (10-90%).

I suspect that either I am not measuring the same thing or I may be setting up the measurement incorrectly on the counter. (the user manual has very little on this).

Any help or suggestions would be appreciated.

Thanks,

Mark

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0 shabaz over 3 years ago

I didn't think counters measured rise-time. At least mine doesn't but then mine isn't the same instrument. It's unusual (or maybe it is a very modern counter?).

Normally a 'scope is used for this as far as I'm aware - there may be specialized equipment in some industries perhaps, but the general instrument would be the 'scope. And the 'scope should be set to 50 ohm usually, as Jan says (at least most signal generators would expect the load to be 50 ohm).
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0 Jan Cumps over 3 years ago in reply to shabaz

This one has the rise time functionality. It's a rather advanced (and expensive) instrument.
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0 Jan Cumps over 3 years ago in reply to shabaz

This one has the rise time functionality. It's a rather advanced (and expensive) instrument.
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0 shabaz over 3 years ago in reply to Jan Cumps

Interesting, nice feature.
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