Electronics > Beginners

Which Oscilloscope should I purchase for my requirements?

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tautech:

--- Quote from: rstofer on December 14, 2018, 06:44:17 pm ---
--- Quote from: tautech on December 14, 2018, 06:37:33 pm ---
--- Quote from: renegadeandy on December 14, 2018, 06:30:48 pm ---Hi all,

Thanks for your thoughts so far. Do you think settling on the https://www.tester.co.uk/siglent-sds1202x-e-bench-oscilloscope?gclid=Cj0KCQiAxs3gBRDGARIsAO4tqq1wLJiRZvC462onvaNrLn8jZ2fOoXys-3NnZA6rgvdEbzml7bIHmuYaAmbDEALw_wcB would be a good ide?

I am not sure what Oscilloscope based optimisations make sense for my video based workings.....does anybody have any experience around this?

--- End quote ---
Good choice and a best seller.
You do need a DSO rather than a CRO for the nonrepeditive waveform work you propose.

--- End quote ---

It looks like a great scope and I plan to buy the 4 channel version at some point.  However, it still doesn't have anywhere near enough bandwidth to look at HDMI waveforms.  It can't even do the 3rd harmonic of a 165 MHz square wave.

--- End quote ---
Understood.
Maybe you missed this in the OP:

--- Quote ---however I want to understand at a more fundamental level what is going on within my setup. I.e I want to see the RGB signal coming in, understand it's form, and then trace how that gets digitized, before it is passed onto the Cyclone IV (FPGA) for processing.
--- End quote ---
A 200 MHz DSO shouldn't have too much problem with that.

rstofer:

--- Quote from: tautech on December 14, 2018, 07:44:00 pm ---
--- Quote from: rstofer on December 14, 2018, 06:44:17 pm ---
--- Quote from: tautech on December 14, 2018, 06:37:33 pm ---
--- Quote from: renegadeandy on December 14, 2018, 06:30:48 pm ---Hi all,

Thanks for your thoughts so far. Do you think settling on the https://www.tester.co.uk/siglent-sds1202x-e-bench-oscilloscope?gclid=Cj0KCQiAxs3gBRDGARIsAO4tqq1wLJiRZvC462onvaNrLn8jZ2fOoXys-3NnZA6rgvdEbzml7bIHmuYaAmbDEALw_wcB would be a good ide?

I am not sure what Oscilloscope based optimisations make sense for my video based workings.....does anybody have any experience around this?

--- End quote ---
Good choice and a best seller.
You do need a DSO rather than a CRO for the nonrepeditive waveform work you propose.

--- End quote ---

It looks like a great scope and I plan to buy the 4 channel version at some point.  However, it still doesn't have anywhere near enough bandwidth to look at HDMI waveforms.  It can't even do the 3rd harmonic of a 165 MHz square wave.

--- End quote ---
Understood.
Maybe you missed this in the OP:

--- Quote ---however I want to understand at a more fundamental level what is going on within my setup. I.e I want to see the RGB signal coming in, understand it's form, and then trace how that gets digitized, before it is passed onto the Cyclone IV (FPGA) for processing.
--- End quote ---
A 200 MHz DSO shouldn't have too much problem with that.

--- End quote ---

Yes, on the RGB side of the FPGA, that 200 MHz Siglent would be excellent.  Well, close to excellent.  The signals are probably around 50 MHz and we would only clearly see the 3rd harmonic and the 5th would be down somewhat.  It might be entirely adequate.  But hopeless on the HDMI side.

I went to Keysight looking at high bandwidth scopes.  They are pricey!

We don't always realize how good we have it with these entry level DSOs.  Decent bandwidth at very attractive prices.  Maybe 1/10th of what they used to cost for similar bandwidth.

tautech:

--- Quote from: rstofer on December 14, 2018, 07:50:32 pm ---We don't always realize how good we have it with these entry level DSOs.  Decent bandwidth at very attractive prices.  Maybe 1/10th of what they used to cost for similar bandwidth.

--- End quote ---
Indeed.

In just the few years I've been selling, BW has doubled and functionality grown massively and all for the same price.....higher sensitivity, faster processing, good FFT, Decode, more memory, History etc etc.

What will the next 10 yrs advancements bring ?  :scared:

woodchips:
Do you have room for, and don't mind swapping around, for more than one scope?

For high speed signals what about a Tek 7000 with a 7T11 and 7S11 giving 10+ GHz? Can then use a cooking DSO for the lower frequency stuff. HP do a similar sampling scope but be aware that it will only trigger to 1GHz. Yes yes I realise that these old bits of junk are no where near as flash as the scopes mentioned, but do you want to look at signals or not? Will a DSO ever have a 12GHz bandwidth, and trigger at that frequency, for less than the cost of a house?

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