#1955 ZOYI ZT-702S Digital Oscilloscope Multimeter

Episode 1955
sent into the channel for review
ZT-702S Digital Oscilloscope Multimeter 9999 Counts Multimeter

[IMSAIGuy]

From the maker:
@zotekmultimeters4774
Hello! I am Jully from ZOYI manufacturer. The 702S model has not been discontinued; it is still in production and remains one of our best-selling products.

[tonyfremont]

This isn't terrible for $50, probably usable for vintage computer (8088, 6502, z-80 etc). I like the font on the meter, and ive definitely seen slower update rates.

Specifically to imsai_guy, if you'd walked into a radio shack in 1975, and this was in the glass case for $49.95, what would you have done. I dont think todays tinkers really understand how cheap good test equipment is, and how cheap and easy it is to get into the "computer trainer" hardware arena compared to those times. Its incredible that microwave motion detection and lidar are hobby items. It sux getting old, but im so glad to have seen the entire home computer evolution. I would love to have had an imsai, altair or even an apple back then, but those were well out of reach. In those days, "adults" didn't understand why anyone would want a computer in their house. I did get to build a cosmac elf ii though. I still have it.

[TheDefpom]

I reviewed the ZT-703S (the dual channel version) a while ago, it did pretty well, tested all accuracies on my calibrators and standards and had no issues with calibrating the probes .

[shagreobe]

I have one of these, and I love it. Just wish I would have maybe waited for the dual scoped version. I loved the digital meter screen.

[KeritechElectronics]

Looks pretty nice and useful. A far shot from a Soviet S1-112A portable analog scope which had a built-in digital VOM. It displayed 7-segment digits as vector graphics on the scope CRT.

[robindeputy]

I have both the ZT-702S and the ZT-703S. The 702S came with a garbage 18650 battery and the meter would show low battery within seconds of turning it on. I replaced the battery and all was fine thereafter. The 703S I bought did not come with a battery, so I installed one of my own and it also worked fine. I do prefer the dual scope version for signal comparisons. The display is easy to read. Menus require a little familiarization time, but both are handy tools.

[fabiotrevisan]

Hello... Just a comment on what you probably didn't pay attention...
When you tried to calibrate the oscilloscope probe, you were at 100KHz...
The change of amplitude while trying to adjust the compensation of the probe at this frequency is pretty much expected (in any oscilloscope).
It's still true though that the step response is horrible as a - say - 5MHz oscilloscope should display a decent square wave at 100KHz.

[zotekmultimeters]

Hi! This is Jully from ZOYI manufacturer. Thank you for the review!

[MrPenguin]

Shame on Zoyi for sending a discontinued one channel oscilloscope. 😮. I hope they read comments.

[RensePosthumus]

There is also a two channel version. I like that one better.

[abijeetrs]

I just searched for this scope yesterday, what a coincidence!

[Homer]

I've got one of these, an early production run. I could not update the F/W in it. I had Windows interrogate the 702's memory & it found that it was corrupted. Windows offered to repair it & it did! I was then able to install the latest F/W.

[jspencerg]

They just sent this for review? It's a year late. Perhaps it's an effort for clearance as they have been selling the 703 model for about 6 months.

[Dr_Mario]

I use Zoyi ZT-703S oscilloscope which is honestly better than 702S in term of oscilloscope measurement specifications.

[Manf-ftzk]

Try to calibrate the probe at 1kHz or below there it might work better.

[bitwiz_]

I ended up with a Zotech 702S which seems to be the same, but with no brand name on the box, and the startup screen just says "digital oscilloscope". Maybe it's a clone?
It's been well worth the 80 bucks, and I haven't even tried to use it as a meter yet.

[SmartPcbRepair]

Where is the duty cycle function, how to show duty cycle please reply my comment. Thanks

[uni-byte]

Shouldn't scope probe compensation be done at about 1KHz, not 100KHz?

For the price this thing seems to be a bit of a stinker. For about the same money one could get the Zeeweii DSO3D12 and have a dual channel 100MHz (50MHz dual) scope with larger screen, just as good a DMM and a rudimentary generator to boot.

[felixcat]

I couldn't finish watching this because I could imagine that you just going to repeat what everyone else million people already reviewed this multimeter oscilloscope are going to say so there's nothing new to say here