Test/Review of YZXStudio USB meter ZY1270

Yes, from the above review:
The top usb connector has local auto coding, i.e. when using this the power coding on the power supply is ignored.
The bottom usb connector has data connection from the input connector, any usb voltage shown on the display is for this connector and the usb input connectors.

Ok, I think I understand better, thank you!

Thank you for the review of an yzxstudio power monitor. I bought mine a few years ago it was the usb2.0 black version and the newest one. I have not been keeping track of newer products and feel like Rip Van Winkel.

Here is an explanation: https://www.youtube.com/watch?v=IVNA4gvQzKo&index=190&list=PL1t6JkcqG9NkaqDf0TxcfyBgSCxQExoTS

Here is a review of the monitor I have.

Hello to all,
i’ve a question about this YZXstudio1270.
Why it has the usb 2.0 and not the 3.0?
What’s the differences between usb2 and usb3 regarding the charging process?
Can i charge an usb3.0 device using the YZX1270? Which are the limitations?
Thanks a lot
Manuel

The difference between usb2 and usb3 is two extra data connections and has nothing to do with charging, i.e. the only time you need a usb3 voltmeter is if you want to measure current consumption while transferring data at very high speed in the same cable.
With usb-c the charging may be different.

I got two ZY1270 meters. I plug one to top port of another to so see it codings.
So… Top port of ZY1270 has fixed Apple 5V 2.1A coding, and bottom port is using pass through coding from power supply.
So the question is: will Fast Charge feature be working only on Apple devices as it is coded to force Apple 2.1A coding ? Is it possible to choose another coding on fast charge port on ZY1270 meter? For example I would like it to be coded as Samsung 2.0A?

here is the photo of forced top usb coding:

Auto coding chips will usual look like Apple 2.1 or Apple 2.4A coding, but will change to another coding when required.

how is it detected: “when required” ??

Looking at the voltage and pulsing on the data pins.

“2635 could be a usb auto coding chip.”

Do you know where can I find some specification about this chip ?

If I had found any specification I would not have said “could be”, but “is”.
There is very little doubt about it, it has two pins that looks like they are connected to the usb connector.

Okey you were right. The chip name is UC2635. I found specification on this site: http://wenku.baidu.com/view/e3660480f8c75fbfc77db2ec.html###, I dont know how to download full pdf text from this page so I made some screenshots of first 4 (and only?) pages. You can see it here: Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.. I found also UC2631 pdf you can download it also in this folder.

In my opinion Auto Fast Charge on Samsung Devices is not working as it should. It always emulate Apple 5V 2.1A. Even when I connect ZY1270 to DCP 5V 1.5A and try to power Samsung Galaxy Tab it always shows Apple 5V 2.1A but I think it should switch to Samsung 2.0A. When I charge Ipad it works very good and talking much more power compare to port without emulation(direct DCP 5V 1.5A).

The auto coding does not always work perfectly, but for when the charger has forced wrong coding it helps a lot… I had a defective powerbank stuck with “USB 480MBPS” coding and wouldn’t charge anything past 1A, and this meter fixed the issue.

When connected to my A9, the display shows Samsung coding for approx. 2 seconds, then changes back to Apple.

you can download the manual on english here.

http://www.kaayee.com/wp-content/uploads/2016/12/User-Manual-for-USB-Tester-ZY1270.pdf

Regards!

What doy you guys think about this review?
http://www.kaayee.com/yzxstudio-zy1270-usb-meter-review/

Isn’t that the same review as is posted here? It being written by the same person and all…

“Reprinted from www.lygte-info.dk”
Now i see the point :smiley: