EEVblog 1597 - Zoyi ZT-703S $80 2CH 50MHz Oscilloscope/Multimeter Review

Looking at the new $80 Zoyi/Zotech ZT703S Dual channel 50MHz 25,000 count 0.05% handheld oscilloscope/multimeter compared to the single channel 10MHz 10,000 count ZT702S

00:00 - The new $80 ZT-703S vs the $60 ZT-702S
03:40 - Power on and screen differences
06:25 - Multimeter
07:49 - The Bargraph is still a complete JOKE
08:50 - Power-off memory test
09:41 - Dumb Arse Dave BRICKS the ZT-702S !
10:23 - The SAME current measurement FAIL
12:19 - 0.05% ?
13:17 - Same BNC connector issue
13:44 - The signal generator is still a joke
15:53 - Trigger level issue FIXED
16:39 - Range overload bug FIXED
19:10 - Teardown
25:07 - Oops...
25:21 - Battery life and current consumption test
26:54 - Conclusion

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#ElectronicsCreators #Review #Oscilloscope

[kbr]

If you buy the kit that includes two probes, they ship it with the second probe taped to the box containing the scope and wrapped in a mountain of bubble wrap. Unwrap it carefully and don't just cut the wrap off like I did, or you'll end up with a single probe kit plus 6 pieces of scope probe cable.

[AGuyInFargo]

A guy I met on a flight, saw some of the videos I watch and recommended your channel. I wish I could find that guy. He knew me better than half my close friends.

[rogersellers]

Dave, you may have been a little harsh in your evaluation of the Zoyi ZT-703S with regard to its stated 50MHz bandwidth. The scope comes shipped with the bandwidth setting (shown under the menu setting “Run Mode”) set to “Normal Mode”, which limits the bandwidth to a maximum of 30MHz. This is done to lower power consumption. To measure signals up to the 50MHz maximum, you need to change this setting to “High-Speed Mode”, although it states the power consumption will increase. I would like to see you re-evaluate this scope with the setting on High-Speed Mode and see if it does reach its full 50MHz bandwidth and maybe check the power consumption in this High-Speed Mode compared to Normal Mode and let us know how it compares. Thanks!

[JeepinBoon]

I can see a good use in the automotive field. Having a battery operated scope with live feed and trigger save can be a blessing for catching intermittent problems. Intermittent problems are the worst!

[alphabeets]

The bargraph is useful when you are watching to see if the reading is moving up or down. Visually seeing a meter needle move in a direction is easier than remembering and comparing numbers in your head. The needle also shows the rate of change. Quite useful.

[svrs]

love it man.. you cover the entry level stuff with just as much detail and insight as you do the high end gear. thanks

[oldgeezerproductions]

I use my 703 to capture ignition secondary waveforms to see how the coil, wires, plugs and combustion chambers are operating while running. For this application, I can't imagine anything that would be more handy. I use it with motorcycle engines and it works superbly capturing even the little inductive bounces at the end of the burn line. I've been using it with a single inexpensive Hantek HV probe, but I have a second probe arriving tomorrow so I can check and compare two cylinders simultaneously. Earlier, to see if I really needed to go to all that work, I used the 703 and the Hantek probe to check the plugs of a GMC 3/4 ton truck's V8 engine. Although the engine ran smoothly, the scope said 'GET NEW PLUGS NOW!' and yes, they were indeed worn beyond anything I'd ever seen when I pulled them.

The only thing that works better for this kind of ignition testing is my large lab scope that has to be plugged in to AC and isn't really practical to use on the shop floor.

[Gossamer]

Well, I've seen Dave get excited over an oscilloscope AND seen an oscilloscope get excited by Dave all in one video now! Haha!

[TheScarvig]

one of the best things that i learned about these handheld scopes is that they are isolated from ground.... that makes them really useful for analysing signals in machinery where you dont neccesary know if the pin is safe to be grounded or where you need a relative measurement.

ive blown a couple breakers by accidentially hooking up the scope ground to a port that was not happy about getting grounded through the earth of the scope.

[Larry-AKZ]

I won't be upgrading. The 702 suits me fine for measuring all that I do. 10MHz is good for checking power supplies, analog, and switching. Audio circuits. The analog multimeter is great for tuning rf and if circuits. The meter is accurate for most uses. Thanks for the review of the 703.

[flubba]

Oh man, I don't need this, but I want one so bad.

[bxl]

Just taken delivery of 703S using your aliexpress link after watching your video. £76 with two sets of probes delivered to the UK in 7 days. Mine has firmware version 1.2.7 which seems to be the very latest. While testing 703S, I found a bug whereby if you make any changes the function generator settings in the 'Output Setting' menu, the time base cannot subsequently be set to any value less than 100 uS. To fix the problem, go to the 3rd menu and choose 'Default ON' to restore settings back to factory defaults.

[carl-lz]

Dave, I bought a 702 a few months ago and the unit delivered has a defective probe. The switch would not select x1 ... x10. Amazon sent me a new scope and didn't require me to return the original one. So I bought a new probe and now have 2 scopes. Lucky Me!

[reedreamer]

Two years ago I bought the OWON HDS272S 70 MHz Oscilloscope 3 in 1 (2 channels plus built-in function generator) with 20, 000 count multi-meter. Its totally rectangular so its a bit "boxy", but its got two 18650's and every function works as it should. Its a totally usable oscilloscope (and multimeter) when I need isolation or something to carry portable, like finding a bad fuel injector on my truck.
The Zoyi does have the edge on form and style, though. I like the rounded face and the slightly curvy body - it just looks better.

[TheDefpom]

I got one to review too, will be publishing it today, had to split into two videos, with second part being published later… I ended up with 2 hours of footage !

[wtmayhew]

I would recommend paying a little more and going with the Owon HDS242S. That’s a two channel 40 MHz scope, 20, 000 count meter and 25 MHz function generator. I easily found it listed for $140 US, but I assume you could find it for less. It is worth paying a little more because the Owon instrument meets or beats the promised specifications. The Owon uses two 18650s which are easily field swappable under a removable cover. Accessories are similar: carry case, meter probes, one scope probe, alligator clip co-ax cables, charger/cable, manual. I carry the 100 MHz version of the Owon in my tool bag.

[Crookmk]

Would be interesting to see how this compares to some of the cheapest desktop oscilloscopes. At least comparing the problems and jankyness

[sonorangaming]

Just got one of these and i absolutely loved how easy it was to update the firmware. No proprietary software needed like a lot of other instruments. Mine did come with two oscilloscope probs.

[vincentv]

I just bought a FNIRSI 2C23T from aliexpress for a project. Good to know these cheap Oscilloscope Multimeters aren't complete garbage.

[raytry]

They removed the writings of the chips probably because they don't want to see dozens of copies of their product.