New Zoyi multimeter+oscilloscopes - ZT-70xS, up to 50MHz/250MSps (nov 2022)

[cncjerry]

I'm testing my 703s and had a board sitting here with three, 3.0uf electrolytic caps on it.  My ZOYI smart tweezers, pretty amazing device for the money, reads them perfectly but the 703s won't read them at all.  I assume it is because of how the 793s reads the caps vs the 703s which uses an A/C signal?   

Overall, the 703s is doing what I needed it to do.  I can trace SPIDF signals fine and some other things for which I would normally drag out a larger scope. 

Jerry

[Edmiri]

The test leads are to long. Try shorter ones. Also whait a bit and it will show the values.

[cncjerry]

tried very short leads, no luck.  None of my other meters, except for the zoyi tweezers, will read the caps in-circuit on this board reliably.  Sometimes my agilent U1252B will.  Overall, still impressed with the 703s for the money.

[csuhi17]

How much does it not measure them, what's the difference?!
I quickly measured two 4.7u electrolytes and the Zoyi tweezer measured around 4.7uF at 100Hz, the ZT-703s measured around 5.1uF.
The factory Zoyi test leads were bad for me, I had to replace them.

[cncjerry]

it just counts up to OL.  The caps are 3uf, approx.  I don't have a problem with caps out of circuit.  there is a wide range of voltages used by the meters I'm testing.  Something is clearly conducting on this board when the voltage gets above about .3v but I don't see any diodes or transistors. The tweezers use AC sine wave and work perfectly.  I'm using the 703s, agilent and a new SHS820X and none of them will read the caps except the tweezers.

[cncjerry]

I'm trying to save a file and pressing the hold/save key, I get a 'save failed' message.  Doing something wrong?

Thanks

Jerry

[xKertx]

I'm trying to save a file and pressing the hold/save key, I get a 'save failed' message.  Doing something wrong?

https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5632455/#msg5632455

[r6mf49t2]

Firmware V1.5.5 has appeared, has anyone checked it?

[xKertx]

V1.5.5 Version Upgrade details:
1. The measurement speed of AUTO has been optimized

[OLderDan]

Firmware V1.5.5 has appeared, has anyone checked it?

The icon for run mode is different and the trace seems to be less filtered at first glance, but I haven't recalibrated yet to see if that changes the jitter now shown. There is noticable glitching of the display when changing v\div and simply moving through the menu that wasn't there before. They didn't fix triggering slow signals being lost below 500ns and they didn't fix the cursor icon colour not changing to show which trace is selected or that cursors lose position if you change modes. I'm going back to previous firmware.

[xfint34]

Auto is faster now. It struggles to detect at lower then 15hz.

[Luca_Techy]

The Single mode trigger bug is still present <=250ns. Anything you trigger in single mode at 250ns or faster won't trigger at the selecter trigger point. You need to scroll right a good deal (a few pages) to find the correct trigger point after the trigger. I'm amazed nobody has noticed this rather major bug - I wonder if it's only mine at this point!

https://youtube.com/shorts/XRGxF6oBQFs

[indman]

The Single mode trigger bug is still present <=250ns. Anything you trigger in single mode at 250ns or faster won't trigger at the selecter trigger point. You need to scroll right a good deal (a few pages) to find the correct trigger point after the trigger. I'm amazed nobody has noticed this rather major bug - I wonder if it's only mine at this point!

And if you read the previous posts in the thread more carefully or search the topic?
https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5664291/#msg5664291
https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5765033/#msg5765033

[xfint34]

The output settings got buggy in v1.5.5. Sometimes it jumps to the previous setting. The 5khz sine wave can sometimes be glitchy. Like the amplitude is jumping all over the place.

Overall it appears each firmware version is a small step forward and some steps back with new bugs. I wonder if they don't have enough unit testing to catch regressions.

[cncjerry]

I'm trying to save a file and pressing the hold/save key, I get a 'save failed' message.  Doing something wrong?

https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5632455/#msg5632455

Format is removed on version 1.4.2 and FFT is added on that button.  So if that is what you were referring to, I can't do a format.  Maybe the latest firmware corrected it.

[cncjerry]

unless I am doing something wrong, the new firmware, 1.5.5? doesn't fit.  No format button on the menus.

[dn1983]

No format button on the menus.

You can restore factory settings, after it flash disk will be repaired.

[dn1983]

I payed attention, that new menu appeared.
Menu -> SAMPLE: HD or PEAK.
Somebody knows, what does it mean?

[BOPOH]

Format is removed on version 1.4.2 and FFT is added on that button.  So if that is what you were referring to, I can't do a format.  Maybe the latest firmware corrected it.

1.4.2 / 1.5.5
menu -> MoreApps -> menu (ImgView) ->  (There is nothing about Fn keys on the screen) F3 -> F3 (format)

[indman]

1.4.2 / 1.5.5
menu -> MoreApps -> menu (ImgView) ->  (There is nothing about Fn keys on the screen) F3 -> F3 (format)

This is in the style of Chinese logistics - hide the function important and warn others nothing about it!

[cncjerry]

Don't know how you found that menu.  Just pressing function keys hoping for the best I guess.  Thanks

p.s.: 1.5.6 is up there.  Adds switchable Russian interface. Kak raz to, chto mne nuzhno.

[indman]

Overall it appears each firmware version is a small step forward and some steps back with new bugs. I wonder if they don't have enough unit testing to catch regressions.

It's really true!
What's the point of their new versions 1.5.6...1.5.7...1.5.8 if they don't fix old the gross bugs in the software?

[wedgehog]

Anyone got a link to ver 1.55 please?

[fortis]

Anyone got a link to ver 1.55 please?

1.55 - https://drive.google.com/file/d/1xgdgFe6GohxC1WyyIX2O0uyEkZHiOHiv/view
1.56 - https://drive.google.com/file/d/12Gxb3DFtqoraxpqkC3cRqKC9haMOEV1Y/view

[RAPo]

Thank you.