Products > Test Equipment
REVIEW - Rigol MSO5000. Tests, bugs, questions
tautech:
--- Quote from: vicki20july on September 04, 2022, 09:40:45 pm ---My apology if this is slightly off topic but I think it is still relevant to the MSO5000 tests, bugs, questions. I have been looking to buy my very first oscilloscope...............
3. Once I receive the Oscilloscope, is there a list of some common / basic tests that I can do to verify the proper functionality of the oscilloscope upon receiving. If possible, please highlight some basic / quick tests that I can do to verify this. For peace of mind, I would like to ensure that the Oscilloscope I received is functioning as intended and does not have any hardware related issues. Any help is greatly appreciated.
--- End quote ---
Your very first scope and respectively may I ask what qualifications and equipment you might have to put a modern oscilloscope through its paces ?
Then consider all are built to a design brief yet the model you buy may not be the top model is that series and instead a lesser model with its capabilities restricted by SW, however even when this is the case BW traditionally exceeds that stated on the label, normally by 10-20% but sometimes to a substantial degree as I discovered when checking the -3dB BW of the very first SDS2104X Plus we received that instead of a little above the 100 MHz label as one would expect it was actually ~185 MHz !
So astonished I was I checked it again with 2 further signal sources before posting about it here a couple years back.
Then if we are to check amplitude accuracy, how ?
Scopes typically offer +3% vertical accuracy which is not a particularly challenging specification however it is typically over their entire frequency and attenuation range, and not just a DC value.
When you could maybe use a AWG but then how do we know its output is level over its frequency range which perfectly demonstrates this stuff gets hard.....and fast !
Good luck with your decisions.
Fungus:
--- Quote from: tautech on September 04, 2022, 10:59:37 pm ---Therefore with 4ch active sampling rate is 1GSa/s, sufficient to meet Nyquist at 350 MHz but not at 500 MHz where the SW dictates it to be a 500 MHz 2ch DSO or if 4ch must be used restricts capability to 350 MHz.
--- End quote ---
Does it have a 350Mhz low pass filter in the front end or is it up to the user to understand why the displayed signal is wrong?
tautech:
--- Quote from: Fungus on September 05, 2022, 01:25:55 am ---
--- Quote from: tautech on September 04, 2022, 10:59:37 pm ---Therefore with 4ch active sampling rate is 1GSa/s, sufficient to meet Nyquist at 350 MHz but not at 500 MHz where the SW dictates it to be a 500 MHz 2ch DSO or if 4ch must be used restricts capability to 350 MHz.
--- End quote ---
Does it have a 350Mhz low pass filter in the front end or is it up to the user to understand why the displayed signal is wrong?
--- End quote ---
As written that you chose to delete:
On each active channel tab this info is displayed for the user to be fully informed of how the scopes is configured.
As you should know BW capability is controlled in the analogue section of the input and normally in the same IC that provides 20 MHz limiting which notification also appears in the channel tab when it's engaged.
So this IC controls label BW and depending on how it's SW controlled the signal pass integrity and user indication of what the scope is actually doing so the user can decide how best to use it.
For SDS2000X Plus channel tab BW indications are as follows:
Full = Max label stated BW for the model
350 = 500 MHz model with 2 active channels on either ADC. (auto BW limit to meet Nyquist)
100 = 10 bit mode engaged.
20 = BW limiter engaged.
vicki20july:
--- Quote from: Fungus on September 05, 2022, 01:09:47 am ---
You can use the extra sample rate on the Rigol reduce noise by oversampling. This is a new feature added in a firmware update (it happens!) so it makes all older threads that discuss noise less valid.
--- End quote ---
Thank you all for the replies. Just wondering, Fungus is it there any video showing this functionality / improvement or is it documented anywhere. Is it a respectable improvement.
Fungus:
--- Quote from: vicki20july on September 05, 2022, 02:24:13 am ---
--- Quote from: Fungus on September 05, 2022, 01:09:47 am ---
You can use the extra sample rate on the Rigol reduce noise by oversampling. This is a new feature added in a firmware update (it happens!) so it makes all older threads that discuss noise less valid.
--- End quote ---
Thank you all for the replies. Just wondering, Fungus is it there any video showing this functionality / improvement or is it documented anywhere. Is it a respectable improvement.
--- End quote ---
It's called "high res" mode.
nb. The video also shows also color grading mode which can use "averaging" mode to highlight the true signal inside the noise by averaging various waveforms together.
If you mess around using the two techniques you can probably find what you're looking for.
Siglent owners will counter that they don't need to "mess around", which is true. Again: It all comes down to what you're going to be using your 'scope for. FUD is an easy thing to spread here.
Difference between high res and averaging:
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