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Bandwidth limit on Siglent SDS2000X Plus oscilloscope

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pdenisowski:

--- Quote from: swmcl on July 06, 2023, 05:21:49 am ---How do I check what the B/W limit is in my scope ??

--- End quote ---

As @tautech posted above, the easiest way to check the bandwidth of your scope is to use a sinusoidal input signal of a known amplitude and increase the frequency until the measured amplitude has decreased by 3 dB.  That frequency is the "bandwidth" of your oscilloscope as defined by most scope manufacturers.

Bandwidth can also be specified in terms of the rise time of a pulse, but this is a more difficult measurement to make (need a good pulsed signal source) and also requires some knowledge of the frequency response (Gaussian vs. brick wall) of the scope's front end to get an accurate number.

I talk about both of these in my video on oscilloscope bandwidth:

tautech:

--- Quote from: tautech on July 19, 2023, 08:49:00 am ---
--- Quote from: tautech on July 18, 2023, 01:24:41 am ---
--- Quote from: Martin72 on July 17, 2023, 10:24:34 pm ---The "real" bandwidth of a 2104X+ is way over the 100Mhz, would be interesting to know what bandwidth you have now with the 200Mhz upgrade.

--- End quote ---
Yes, this is something I need do for 'the record'.
Hopefully I can fit it in tomorrow after installing the free BW upgrade option.

For the record and as tested before, SDS2104X Plus -3dB BW is ~185 MHz. (checked with 3 different sinewave sources)

--- End quote ---
For the record....
SDS2104X Plus with free BW upgrade promotional license applied to become SDS2204X Plus....

SSG3000X waveform first checked @ 100 MHz to be precisely 1V p-p.
-3dB BW is now 300 MHz + a couple of MHz, an increase of ~115 MHz over SDS2104X Plus

--- End quote ---

And while I have a stock SDS2354X Plus unpacked......

Same setup for the source as above but this time pushed to 491 MHz for the -3dB point....

Result = purchase a 350 MHz model and receive nearly a 500 MHz one.  :o

seronday:
Out of curiosity, what reference frequency did you use for the -3dB bandwidth calculation ?

tautech:

--- Quote from: seronday on July 19, 2023, 11:21:36 am ---Out of curiosity, what reference frequency did you use for the -3dB bandwidth calculation ?

--- End quote ---
No calculations are required when you have a 3.2 GHz RF gen.  ;)

Only a check levels are correct at some base frequency before pushing upward, we used 100 MHz 1V p-p as mentioned here:
https://www.eevblog.com/forum/testgear/bandwidth-limit-on-siglent-sds2000x-plus-oscilloscope/msg4968844/#msg4968844

Otherwise if using the Bodnar pulser, it provides extremely fast edges @ 10 MHz

Martin72:

--- Quote ---Otherwise if using the Bodnar pulser, it provides extremely fast edges @ 10 MHz
--- End quote ---

Besides the approximate formula (0.35/risetime), you could also try this:

https://www.teledynelecroy.com/doc/frequency-response-measurements

This didn't really work for me when I had a SDS2000X+, but since then 2..3 firmware updates have passed.
Maybe it works now.

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