Electronics > Beginners

200mhz oscillorscope probe question

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TK:
You have 2 options:

1) Get a fast edge pulse generator and it will push the scope input to the limits and measure the min rise time it is capable of
2) Input a 1Vpp sinewave and measure the attenuation. It should be 3dB attenuation at 200MHz and increase the attenuation as you increase the frequency.  You need a signal generator that can generate higher than 200MHz sinewave.

james_s:
Build an avalanche pulse generator, the classic design by Jim Williams can be built using many common inexpensive transistors, to get rise times well beyond the capabilities of a 200MHz scope you don't need anything exotic.

tggzzz:

--- Quote from: ebastler on March 29, 2019, 05:14:47 pm ---
--- Quote from: tggzzz on March 29, 2019, 04:47:44 pm ---_________________________
There are lies, damned lies, statistics - and ADC/DAC specs.
Gliding aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less

--- End quote ---

Off-topic, but I have meant to ask a few times when I came across your signature:
What do you mean by "span" here, and how can it be bought?

(Honest question from a non-native speaker. Thanks!)

--- End quote ---

I doubt many native speakers would understand it, at least not without thought!

Span as in wingspan. Basically longer thinner wings are better at gliding speeds - you can go further and/or faster between thermals. As you can imagine, longer and thinner tends to be more expensive.

tggzzz:

--- Quote from: james_s on March 29, 2019, 06:24:08 pm ---Build an avalanche pulse generator, the classic design by Jim Williams can be built using many common inexpensive transistors, to get rise times well beyond the capabilities of a 200MHz scope you don't need anything exotic.

--- End quote ---

Pulses don't tell you much, unless you know the shape and size of the pulse, and do the deconvolution to find out the UUT's response.

The latter is tedious, especially with non-digitising scopes.

ebastler:

--- Quote from: tggzzz on March 29, 2019, 07:29:53 pm ---Span as in wingspan. Basically longer thinner wings are better at gliding speeds - you can go further and/or faster between thermals. As you can imagine, longer and thinner tends to be more expensive.

--- End quote ---

Ahaa! Thank you!
I had totally misconstrued the "gliding" bit, although it's obvious in hindsight. Had been wondering how an aphorism can glide...  ;)

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