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Bandwidth check of my oscilloscope with simple means ?
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tggzzz:

--- Quote from: vk6zgo on December 11, 2020, 01:31:57 pm ---
--- Quote from: 2N3055 on December 11, 2020, 10:42:56 am ---This is second topic with exactly same question from OP.

This one also devolved into discussion about creating fast pulses, like most of them..

Again, answer to OP question, no, there is no simple improvised way to measure -3dB point of scope front end without leveled signal generator.
If you had 200-500 signal generator with decent amplitude accuracy across the frequency (like SDG6000X or similar) you could fairly well estimate what the curve is.

OP never explained what he wants to accomplish or why he asked the question.  Without that it is hard to help him.

--- End quote ---

--- End quote ---

Yes, as I asked the OP in reply #2.

It has only been a day; let's hope he will return with some comments.
nctnico:

--- Quote from: Elasia on December 11, 2020, 12:26:42 pm ---The best way to measure just the scope itself is to get one of leo's pulse gens you can directly attach and once you have a reference you can then attach your probes and see what they are rated for.

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Big fat NO
See my earlier reply.
vk6zgo:

--- Quote from: tggzzz on December 11, 2020, 01:18:56 pm ---
--- Quote from: Fungus on December 11, 2020, 10:53:54 am ---Without it I was getting results in the uS range.

--- End quote ---

How do you use your scope to measure conductance?

(That's a pet peeve of mine)

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 1 uSiemens would be about 1M \$\Omega\$, so you could use the 'scope as the null detector for a bridge.
2N3055:

--- Quote from: Elasia on December 11, 2020, 12:26:42 pm ---Someone needs to stay out of the special candies...

Case in point to not always go by what the mfg says... Siglent SDS2100x+.. can ONLY be legitimately raised to 350MHz but actually has a front end on all units that goes to 500MHz+, typically -3db of around 580-620MHz.

The best way to measure just the scope itself is to get one of leo's pulse gens you can directly attach and once you have a reference you can then attach your probes and see what they are rated for.  You can also check things like bnc cables... half the time people dont know just how horrible they are.  On the other hand most of this is moot if you are dealing with 100MHz and lower

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That is absolutely wrong.  You can officially buy 500MHz bandwidth, but officially you can upgrade only from 350Mhz:

Siglent SDS2000XP-4BW50 Upgrade 500 MHz 4 channel
Bandwidth Upgrade from 350 MHz to 500 MHz for the SDS2354X Plus. Only in interleaving mode For this upgrade the latest firmware is required.
Nr: SDS2000XP-4BW50
EAN: SDS2000XP-4BW50

Also, by using Leo's pulser, you can absolutely make a great verification of scope's  risetime.  Bandwidth is measured by sweep with leveled gen. Period.

If you upgrade the scope, you can use fast pulser to check whether upgrade went through, because you will see faster risetime. And that is all.

Sometimes, some people don't really need to know bandwidth, they only need to check how fast is their scope in showing fast digital edges. That is what pulser is born for.
tggzzz:

--- Quote from: 2N3055 on December 11, 2020, 02:01:35 pm ---Sometimes, some people don't really need to know bandwidth, they only need to check how fast is their scope in showing fast digital edges. That is what pulser is born for.

--- End quote ---

Usually if you are interested in bandwidth/frequency, then it is better to use a frequency domain tool such as a spectrum analyser.

(Or, say it quietly, a scope with an FFT)
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