Electronics > Beginners
Oscilloscope bandwidth - is jump from 100MHz to 200 MHz significant?
tggzzz:
--- Quote from: Harb on March 05, 2018, 10:22:43 am ---From my experience, few people need more than 100Mhz.........
Usually the extra money is forked out because the bigger the bandwidth number the "Cooler" it looks to have one.......same goes with most test equipment actually......
--- End quote ---
Just so, but it is worth knowing the conditions under which you do need more bandwidth, and the consequences of having less bandwidth. There is no substitute for bandwidth.
(Actually, in some circumstances there is, but it requires skill imagination and knowledge. But you can buy bandwidth)
daybyter:
Found this page recently, and was surprised how good a 500 MHz signal looks on a 100 MHz scope...
https://hackaday.io/project/4327-stretching-the-limits-of-a-rigol-ds-1102e-scope
tggzzz:
--- Quote from: daybyter on March 05, 2018, 10:58:28 pm ---Found this page recently, and was surprised how good a 500 MHz signal looks on a 100 MHz scope...
https://hackaday.io/project/4327-stretching-the-limits-of-a-rigol-ds-1102e-scope
--- End quote ---
I wonder what the phase response is; I would have preferred he did the experiment with a square wave.
My Tek 485 (350MHz) will happily display and trigger on a signal that is >1GHz. The amplitude is somewhat reduced, of course :)
rhb:
To avoid aliasing, an 8 bit, 1 GS/S DSO needs to be 48 dB down at 500 MHz. So a 1 Vpp sine wave input displayed on the 100 mV/div scale needs to be reduced to 4 mV or less at 500 MHz. But you'll be able to view it if you switch to a lower input range.
I would not describe those traces as very good as there is a lot of obvious distortion.
Claudius2k:
Wow. Not the answer I was expecting. I thought people would say if you can afford it go for it. But their rationale was very logical. I just purchased a 100Mhz 1104 and was considering returning it for the 1204. No I think you have me convinced 100 Mhz is adequate for me the hobbyist. Of course this is an old post. porches are now $499 vs $759
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