| Electronics > Beginners |
| Is the Rigol DS1054Z still the best buy for a cheap entry level oscilloscope? |
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| rstofer:
--- Quote from: tautech on May 20, 2018, 01:35:14 am --- --- Quote from: rstofer on May 18, 2018, 03:15:42 pm ---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 --- End quote --- Thanks for that! I'm getting more interested in the SDS 2104 as time goes by. As your example shows, 4 channels is definitely the way to go. And 200 MHz is as good as it gets in this price range. |
| JS:
--- Quote from: vk6zgo on May 20, 2018, 01:28:36 am ---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. --- End quote --- As tautech said, phase is also measured with the Siglent SDS1104X-E, so, not your signal gen & level meter measurement. Now, what deffinition of bode plot and frequency response plot was given to you I can't tell, Bode plot is a type of frequency response curve. For me Bode Plot is the kind of plots we are talking about, freq(log) on X axis, amplitude (log or lin in Db) and phase (lin) in two separate Y axis. It's quite easy to visualize a lot of things in that plot, hence it has a name. You can plot many different frequency response curves (frequency on the X axis as you like and whatever on the Y axis as you like) The sharply changing graphs are just a simlpification to be able to do by hand with raw approximations, probably exactly the same that where given to me, then you can plot the actual functions on the computer so they are not sharp anymore and they really match what you would measure in real life (if your model is correct). This is a measurement of a RLC audio equalizer. Mid (peak/dip) and high (shelving) band shown, where it says magnitude I'd change it for phase, probably smaart PC software or something like that, made many years away... I can't belive I found it. JS |
| sibeen:
--- Quote from: Distelzombie on May 18, 2018, 01:59:01 pm --- --- 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. --- End quote --- Someone offers a free scope and you bite his/her head off. Must be one of the strangest responses I've seen on this site. |
| Distelzombie:
--- Quote from: sibeen on May 20, 2018, 02:24:31 pm ---Someone offers a free scope and you bite his/her head off. Must be one of the strangest responses I've seen on this site. --- End quote --- I didn't even read that far. No, I don't want it. It will set the day I get a proper scope back even further. |
| Mattjd:
I have a 1054z at home and it serves my purposes, which is learning and very rudimentary hobbying We have a huge range of Keysight scopes at school. The ones I've played with that are similar to 1054z dont seem much different even if they're a few hundred more. I've also gotten to play with an Infinii Vision 6000 series, its pretty to look at, but for nothing special for what I do. Its in the rf lab with 3ghz func gen, all way too overkill for my shit so I can't really compare. We also have a Infiniium Z-Series that's priced to like $250k with the software, that's in a special satellite lab, need special privileges to touch that one! |
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