Electronics > Beginners
Need suggestions on entry level oscilloscopes for EE students
ModernWires:
Hello EEVblog. I'm looking for a cheap (under $500 USD, preferably under $400) digital oscilloscope. What are some important specs or things I should pay attention to when choosing one? I got a crap scope a couple weeks ago with really low memory depth and terrible menu interface. It was quite annoying to use. I have returned it and started looking for a better one for the money. Is the Siglent SDS1102X-C (not the -E model which is a bit more expensive) any good? It seems to me a decent scope for the money. I've heard that the Rigol DS1054Z is a really nice scope. The problem is you need to hack it to get the full 100MHz bandwidth and there always seems to be the risk of the hack not working. Some people have reported that the hack did not work for them for some reason, which makes me a bit hesitant to get the Rigol.
bob91343:
You might consider getting a used unit. I have a few excellent oscilloscopes, both digital and analog, that I obtained for very little money on craigslist and at swap meets and ebay.
What do you inted to do with this unit? That will help you decide what features and capabilities are appropriate. A digital unit is, in my opinion, not the best for a first timer. Analog devices have more intuitive interfaces and there are some jobs the digital ones can't do easily, if at all.
rstofer:
First of all, unlocking the DS1054Z is not a 'hack', it is a known process, used by the factory, to specify the bandwidth of the front end. Dave has a video showing how there is a selection of two capacitors on the input low pass filter. One for 50 MHz and one for 100 MHz. It makes all the sense in the world for Rigol to design the scope this way because all they have to do is unlock the bandwidth and put on a different label. In fact, the options that unlocking affects are those that you pay the dealer to turn on anyway. This is NOT a 'hack'. It is a process used by the factory and the dealers.
Second, there is zero chance that the unlocking fails. If it did, there would be complaints all over the Test Equipment forum - and there aren't.
I bought the scope and unlocked it. It's a 'no brains required' operation. Just use code "DSER" and nothing else.
That said, the newer Siglent SDS1102 1104 1204 X-E scopes probably represent a better value, have a more responsive UI and are just newer. The 1104 can be unlocked to 200 MHz, details elsewhere. I want 4 channels so the 1104 would be my choice. Yes, I would unlock it fairly soon. Maybe not on the first day or even the first week but certainly within the first couple of weeks. Just in case there is a little infant mortality
rstofer:
If I was a student and realized that I needed both a scope and a signal generator and it would be handy to have a spectrum analyzer for Bode' Plots and FFTs along with a couple of power supplies and a logic analyzer along with a digital pattern generator, I might look seriously at the Digilent Analog Discovery 2. This device was invented for students. The AD2 and a laptop form a lab in a backpack.
https://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/
I use mine all the time to demonstrate fundamental circuits. I can couple the Waveform device square wave output directly back into a scope channel and display the FFT of a square wave. Or, I can use the same square wave to charge and discharge an RC circuit and display the waveform. Sure, we all know what it SHOULD look like but with a couple of components, we can see what it DOES look like.
You can download the Waveforms software and look at all the gadgets in "Demo" mode. Having the software running on a Raspberry Pi 4B seems pretty cool.
Look at the weird prices on eBay! They're all over the map and even the original version is selling for a lot of money. After graduation, sell the AD2 and buy something that takes more space. In the meantime, you can do your lab work with the AD2 while sitting in a coffee shop.
A lot of folks just want a bench full of boxes and I'm no different. But when it comes to convenience, the AD2 is way above everything else. It doesn't have huge bandwidth but it has more resolution than you're likely to find in a reasonably priced scope. It is definitely NOT a toy! If I were a EE student, it is the first thing I would buy. I would buy the student kit and add whatever other gadgets and parts kits I could afford. The capability is amazing!
A while back I was helping a friend with an FPGA project while enjoying coffee at Starbucks. Here we were, at a small table, with 3 laptops open, two FPGA boards being programmed while sipping coffee. It doesn't get any more 'geek' than that! Alas, I don't think a pair 70+ year old retired EEs can be considered geeks. Too old... People were probably laughing...
Shock:
I believe the Rigol DS1054Z now ships with all the other features turned on aside from the bandwidth anyway but you might want to check if that is a sticking point for you. As mentioned it's trivial to turn everything on, it's one of the reasons they have sold so many.
I mentioned this just the other day, don't forget you get 4x 150MHz probes with the Rigol as well. It's a really good deal.
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