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Bandwidth check of my oscilloscope with simple means ?
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Elasia:

--- Quote from: 2N3055 on December 11, 2020, 02:01:35 pm ---
--- 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

--- End quote ---

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.

--- End quote ---
2N3055:

--- Quote from: tggzzz on December 11, 2020, 02:49:16 pm ---
--- 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)

--- End quote ---

Sometimes amplitude is important...
But for strict frequency domain measurements SA is primary instrument... That is not questionable.

Although, i managed to some nice quick checks with a scope on occasion, at 432 MHz and 868 MHz telemetry transceivers. ^-^
2N3055:

--- Quote from: Elasia on December 11, 2020, 03:10:48 pm ---
--- Quote from: 2N3055 on December 11, 2020, 02:01:35 pm ---
--- 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

--- End quote ---

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.

--- End quote ---

--- End quote ---

OK so I didn't understand what was your point here..  Sorry, still don't, but I see that I responded to something else. Sorry for that.
Bud:
There is a neat method how to measure your oscilloscope's bandwidth that Keysight published in a couple of their Blogs. What you do is connect a fast pulser to input, apply Math "differentiate" function, then apply FFT to the result. This will produce a plot in frequency domain. Now use cursors to read the frequency point where level on the FFT plot drops to -3dB from the top.

https://community.keysight.com/community/keysight-blogs/oscilloscopes/blog/2016/09/01/how-to-measure-your-oscilloscope-and-probe-s-bandwidth-yourself
JDubU:
I have a Rigol DS2000 scope that has a trigger output signal with a surprisingly fast risetime (faster than the scope's bandwidth).
To measure the risetime of the scope, I set the scope to auto trigger on one channel and connect the trigger out to the input of the other channel with a BNC cable.  Since it's auto triggering, the scope will free run and the trigger out pulse shows up, in sync, on the second channel.  Set the second channel to measure risetime and calculate the bandwidth from it (BW= 0.35/risetime).

Don't know if the RTB2000 has a fast trigger output risetime.
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