Products > Test Equipment
New Rigol DS7000
Sighound36:
Indeed but using the 0.45 formula would give a a greater bandwidth in retrospective so in essence stretching things a bit I feel!
You can also use a know signal frequency and amplitude as benchmark and work you work up the frequencies until you reach the point of -3db roll off this you can compare to the rise times to check you are getting for a correlation between the two methods.
If you like (Siglent appreciation society founding member) I am happy to work both methods on our Wavepro 254 for you later if you wish.
The 7000 is with one of my colleagues this week, however I can also perform the same tests on the MSO8000 ?
nctnico:
--- Quote from: Sighound36 on February 21, 2020, 05:25:57 pm ---Indeed but using the 0.45 formula would give a a greater bandwidth in retrospective so in essence stretching things a bit I feel!
--- End quote ---
No. Bandwidth is bandwidth.
--- Quote ---You can also use a know signal frequency and amplitude as benchmark and work you work up the frequencies until you reach the point of -3db roll off this you can compare to the rise times to check you are getting for a correlation between the two methods.
--- End quote ---
Only testing with an RF generator yields valid results. Using the risetime is nothing more than an educated guess.
maginnovision:
Yea, those coefficients are essentially guessing at the filter. That's why you go .45 for >=1GHz because it's likely brickwall. The real test is passband flatness across whatever you consider the bandwidth to be. A Rigol may well see an 870MHz signal but it's definitely not going to be flat or a nice roll off. It'll likely be up and down significantly more than the quoted bandwidth range.
fact:
Measured the bandwidth of my MSO7000 with a RF-generator, -3dB frequency at 760MHz for CH1.
This was pretty close to the estimated bandwidth of 810MHz using a Bodnar fast rise-time generator.
Martin72:
Didn´t really need an rf generator for my works and buying one only for measure once the bandwith would be too expensive.
They are some chinese things on the market for a few bucks (appx 120€) - But i think, they´re too crappy, or ?
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