Products > Test Equipment
Bandwidth limit on Siglent SDS2000X Plus oscilloscope
<< < (3/8) > >>
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.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod