Electronics > Beginners
Is the Rigol DS1054Z still the best buy for a cheap entry level oscilloscope?
Distelzombie:
--- Quote from: larsdenmark on May 16, 2018, 08:55:47 am ---If you haven't ever tried a scope before you may want to start with an analog scope. I have one you can get for free if you are willing to buy your own probes (I live in Copenhagen).
Digital scopes can of course do much more, but having any scope can make the world of a difference from not being able to see any signal values at all. Once you have a little experience with an analog scope you may be able to decide what features and channels you really need.
--- End quote ---
I'm saying it: Buying an analoge scope today, for inevitably 150€ (incl. Repair, probes...), is NOT a good thing to suggest. My opinion is:
1. They are mostly either defect or have been repaired before = High change it will break again soon.
2. They're 20 to 30 years old and have disappointingly low amount of features.
3. You paying so much for them, the same money could go into the 100€ DSO from Banggood. It is better -> because of it's many features, not bandwidth. You can flash your own firmware on it and will do whatever math function you want it to do.
So I will never buy tech that is 30 years old just to... to what? Are you telling me to get it for training purposes? (Do you buy yourself a Z80 computer before you buy a new laptop?) What's the purpose of old, failing hardware that isn't calibrated anymore? Training? Like, those toys you played with when you were 1-4? You can't trust what it tells you, so the only thing you can do with it is play.
rstofer:
--- Quote from: JS on May 17, 2018, 11:30:22 pm ---
I know it's a good piece of equipment, the Agilent was a tempting purchase as it has many features, not only the signal generator and bode plotting. I'm very used to do bode plottings and found them so useful as I work a lot with audio and freq/phase response is all, much more useful than looking at time domain signals. For audio freq is easy with the PC, 24 bits converters and all the toys there. The update rate in the siglent is much faster, record mode always on to catch the glitch you missed, the option to add the mixed sinal after the fact, same with signal gen and wifi(kind of a toy, network is fine).
I guess I should have a code to do the bode in matlab or something and capture the data to the PC, but I'm use to do post processing of osciloscope data in the computer, as many things you can't do just with math data from the scope, would be nice that scope brands let people add it's own software to them as apps to process the data, haven't seen that though or the Rigol at least.
JS
--- End quote ---
Do these scope based Bode' plots include phase? I can see how they can sweep a voltage and measure amplitude but I am curious if they also somehow display phase. More stuff to read, I suppose.
BTW, a Bode' plot without phase is pretty much worthless. I can get the same answers with a DMM and a pencil and paper.
JaspaJami:
I did order Siglent SDS1104X-E today. Little bit more expensive than Rigol DS1054Z, but i think its better for my use.
vk6zgo:
--- Quote from: rstofer on May 18, 2018, 03:15:42 pm ---
--- Quote from: JS on May 17, 2018, 11:30:22 pm ---
I know it's a good piece of equipment, the Agilent was a tempting purchase as it has many features, not only the signal generator and bode plotting. I'm very used to do bode plottings and found them so useful as I work a lot with audio and freq/phase response is all, much more useful than looking at time domain signals. For audio freq is easy with the PC, 24 bits converters and all the toys there. The update rate in the siglent is much faster, record mode always on to catch the glitch you missed, the option to add the mixed sinal after the fact, same with signal gen and wifi(kind of a toy, network is fine).
I guess I should have a code to do the bode in matlab or something and capture the data to the PC, but I'm use to do post processing of osciloscope data in the computer, as many things you can't do just with math data from the scope, would be nice that scope brands let people add it's own software to them as apps to process the data, haven't seen that though or the Rigol at least.
JS
--- End quote ---
Do these scope based Bode' plots include phase? I can see how they can sweep a voltage and measure amplitude but I am curious if they also somehow display phase. More stuff to read, I suppose.
BTW, a Bode' plot without phase is pretty much worthless. I can get the same answers with a DMM and a pencil and paper.
--- End quote ---
When I learnt about these things, a "Bode" plot was an idealised rendition of the response of a network, with
Amplitude & Phase shown as changing sharply at "break points".
The plot you could realise in the real world with a signal generator & level meter or a tracking generator &
Spectrum Analyser was normally called a " frequency response plot".
In real life, the "break points "are not sharp, but gradual.
tautech:
--- Quote from: rstofer on May 18, 2018, 03:15:42 pm ---
--- Quote from: JS on May 17, 2018, 11:30:22 pm ---
I know it's a good piece of equipment, the Agilent was a tempting purchase as it has many features, not only the signal generator and bode plotting. I'm very used to do bode plottings and found them so useful as I work a lot with audio and freq/phase response is all, much more useful than looking at time domain signals. For audio freq is easy with the PC, 24 bits converters and all the toys there. The update rate in the siglent is much faster, record mode always on to catch the glitch you missed, the option to add the mixed sinal after the fact, same with signal gen and wifi(kind of a toy, network is fine).
I guess I should have a code to do the bode in matlab or something and capture the data to the PC, but I'm use to do post processing of osciloscope data in the computer, as many things you can't do just with math data from the scope, would be nice that scope brands let people add it's own software to them as apps to process the data, haven't seen that though or the Rigol at least.
JS
--- End quote ---
Do these scope based Bode' plots include phase? I can see how they can sweep a voltage and measure amplitude but I am curious if they also somehow display phase. More stuff to read, I suppose.
--- End quote ---
Sure they do, the more reading you are looking for:
https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/msg1435854/#msg1435854
https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/msg1436912/#msg1436912
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