Great review and some light comic relief at the end there !! talking scope !...Jeez. Still think its good value but as I said last time it's little brother for a third of the price is very capable I'm not sure this is that much better. Thanks for spending so I don't have too !.....cheers.
what is missing on these 'flexible' units is a I2c decoder which would be much more useful than the voltmeter as most wouldn't buy this unit if they didn't already have a multimeter. the limitations of the scope would not affect its ability to decide a bus as a bus would be in scope terms a relatively low frequency, my main scope does have bus decoding, but do I want to carry around a $2000 scope if I could have a throw away unit for playtime at a mates house.
I have the zt702s and the zt703s. They have very buggy firmware so Ive been looking at this one for a few weeks now. It looks like less frustrating experience to me.
Yeah. All teh sub $100 scope have drawbacks, but from what I've seen, this one has the least drawbacks and offers the most in terms of features. Just don't expect to to match a $1000 SHS810X or something like that. It's a good little $80 scope/DMM with a free but limited signal generator.
I really don't see limitations as bugs. My Zotek read a sine wave yesterday but today decides that it won't unless I restart it 3 times. That's a bug not a limitation. This zeeweii seems as you said limited but not very buggy.
Hi sir - you mentioned updated firmware, regarding the frequency counter. Did you update yours, or does the unit have it already updated when purchasing?
Hello, could you check of how the oscilloscope reacts to a 500 kHz squarewave when the time base is set to 200 ns/div? Mine, no matter if it is driven by an internal or an external generator, shows a remarkable fading oscillation (~1.2 MHz) just behind the edges of the square signal. Does this occur for your scope? Just to be mentioned - faster or slower signals look normal. I've excluded probes and the internal generator. Thanks in advance
Okay, I've found the source of the problem and now I will look for a solution. The problem is related to a DC shift circuit. The signal leaks from a high frequency path back to the DC level shifter (which is based on LM358) and there is a frequency peaking around 1 MHz. According to the schematic of the DSO2512G which is available freely, ZEEWEEI has used OPA1612 instead, at least for that model. I will either replace the opamp or I will play with the DC shifter frequency response to attenuate the peaking. Cheers!
I don't get this using the internal generator. I tested 500 kHz square wave with horizontal time base @ 500 ns, 200 ns and 100 ns. How many cycles of oscillation do you see?
@@uni-byte I tried to attach the link to my website, where I placed a documentation of the repair, but it seems prohibited :) anyway - I've played a bit with the feedback loop, however the only result I've obtained was shifting the oscillation to a different frequency. I've removed LM358 and I've installed OPA2863 instead. No the scope seems operating properly. Cheers!
Thank you for such a detailed review! Going to by it as my first oscilloscope instead of fnirsi)
I don't think you will go far wrong with that decision.
Looks like your getting along with that thing nicely!
I am! It will do for the reasons I got it.
Seems like a nice little scope meter. I would buy one if I didn't already have the Dso154 Pro and a bunch of meters.
Thanks for watching!
good review
Glad you enjoyed it!
@@uni-byte Yeah, I also ordered one for myself!
Great review series. Watched it all. Now I don't have to buy one to have a play with it. Thanks.
LOL! Thanks for watching!
I think the video is supposed to end at around 15:45 and some extra footage got accidentally included. Great review, thanks, take care.
Thanks for that! I'll trim if off.
Hey, I was watching that.
@@mikebond6328 Sorry Mike! What happened?
@@mikebond6328 Sorry
Great review and some light comic relief at the end there !! talking scope !...Jeez. Still think its good value but as I said last time it's little brother for a third of the price is very capable I'm not sure this is that much better. Thanks for spending so I don't have too !.....cheers.
Thanks for watching! Yes, a talking scope is pretty hilarious. Well, it's a beginning. Maybe someday the UI will be entirely verbal.
I think a talking scope is pretty dumb. Unless you don't have hands, then it can be usefull..... i guess.
@@bobisyouruncle1 LOL! Who would do the probing then?
what is missing on these 'flexible' units is a I2c decoder which would be much more useful than the voltmeter as most wouldn't buy this unit if they didn't already have a multimeter. the limitations of the scope would not affect its ability to decide a bus as a bus would be in scope terms a relatively low frequency, my main scope does have bus decoding, but do I want to carry around a $2000 scope if I could have a throw away unit for playtime at a mates house.
That would be handy indeed.
I have the zt702s and the zt703s. They have very buggy firmware so Ive been looking at this one for a few weeks now. It looks like less frustrating experience to me.
Yeah. All teh sub $100 scope have drawbacks, but from what I've seen, this one has the least drawbacks and offers the most in terms of features. Just don't expect to to match a $1000 SHS810X or something like that. It's a good little $80 scope/DMM with a free but limited signal generator.
I really don't see limitations as bugs. My Zotek read a sine wave yesterday but today decides that it won't unless I restart it 3 times. That's a bug not a limitation. This zeeweii seems as you said limited but not very buggy.
@@guateque1718 Ahh, okay, I get what your saying.
Hi sir - you mentioned updated firmware, regarding the frequency counter. Did you update yours, or does the unit have it already updated when purchasing?
Mine came with the latest firmware installed.
Hello, could you check of how the oscilloscope reacts to a 500 kHz squarewave when the time base is set to 200 ns/div? Mine, no matter if it is driven by an internal or an external generator, shows a remarkable fading oscillation (~1.2 MHz) just behind the edges of the square signal. Does this occur for your scope? Just to be mentioned - faster or slower signals look normal. I've excluded probes and the internal generator. Thanks in advance
Okay, I've found the source of the problem and now I will look for a solution. The problem is related to a DC shift circuit. The signal leaks from a high frequency path back to the DC level shifter (which is based on LM358) and there is a frequency peaking around 1 MHz. According to the schematic of the DSO2512G which is available freely, ZEEWEEI has used OPA1612 instead, at least for that model. I will either replace the opamp or I will play with the DC shifter frequency response to attenuate the peaking. Cheers!
I don't get this using the internal generator. I tested 500 kHz square wave with horizontal time base @ 500 ns, 200 ns and 100 ns. How many cycles of oscillation do you see?
@@taki_maciek4799 Interesting. Let us know how you make out.
@@uni-byte I tried to attach the link to my website, where I placed a documentation of the repair, but it seems prohibited :) anyway - I've played a bit with the feedback loop, however the only result I've obtained was shifting the oscillation to a different frequency. I've removed LM358 and I've installed OPA2863 instead. No the scope seems operating properly. Cheers!
@@taki_maciek4799 Great result! Thanks for letting us know about your work on this.