Yeah that’s how 
, then the values are saved on a txt file which you can export to excel and transform to proper V and Ah numbers.
The Ah are not very reliable, specially if voltage fluctuates a lot, say you use quick charge and moves from 5 volts to 9 volts. You must use Wh, I presume you have to go adding up, since the meter does not output that value.
What you have is to divide Wh by desired voltage, say 3.7 volts or whatever, then you get flat Ah.
From my experience, even if you use a long interval like 10s the resulting Ah total from the sum of Amp readings will be within <5% of the real capacity value from the meter itself. Same goes for Wh. This method works unless the device being measured drops in and out of QC, but this rarely happens.
Is it possible to read serial data of YZXstudio ZY1270 over microUSB cable and not only bluetooth? So I can read from computer. I would like to do that because I get BT disconnect after a while, and I want to log for several hours. Looks like bluetooth connection is very weak and you have to keep the smartphone very next to meter. I’ve contacted f-t-2000 seller but no answer. No idea if he’s already present on eBay.
Finally got the bluetooth connection with the YZXstudio ZY1270 working for hours. You just have to put the meter and the phone very close (less than half a meter) because connection is so weak.
I have another question: what is the purpose of the micro-usb input of the ZY1270? I’m trying to use it as external power for the meter, but for some reason it sends power to the output, and it’s also counted in statistics. Is the female micro-usb in this case just another input like the male USB-A? Can’t be used int he same way as TC66C?
What’s the difference between ZY1270 and ZY1280? Does the latest have bluetooth option?
I think there’s quite a number of generations that went from 1270 to 1280.
here’s a features chart for 1270 to 1276. The 1280 basically has all features of the 1276, and then adds some more (like min/max, a micro-USB HID external port, more resolution, etc) (the translation is not so well done…)
Compare my reviews of them:
https://lygte-info.dk/review/usbMeter%20YZXStudio%20ZY1270%20UK.html
https://lygte-info.dk/review/usbMeter%20YZXStudio%20ZY1280%20UK.html
No mention to datalogging methods with practical examples.
I did show these two examples:
Albeit the second one was not done by me.
Still not satisfied with the answer. Does the ZY1280 have bluetooth? Is it an extra or all models have it?
The model I reviewed to not have Bluetooth, the backplate with the Bluetooth module is missing.
Checking the official YZXStudio website (Taobao, in Chinese), it seems there’s a slightly upgraded ZY1280M model:
https://item.taobao.com/item.htm?id=38401794937
(courtesy of Google Translate)
So how do yo datalog, using micro-USB interface?
Using the connector marked PC
Bough from your store on Aliexpress The HD35, and have a suggestion for you: the USB-C port is too much close to USB-A port, can’t connect any USB-C meter like TC66C directly to it, because touches the port. Could you please for future revisions put it more separated and with more angle so I can fit RD TC66C, Satechi USB-C or Plugable power meters? It would look something like this:
Original:
Request:
Same would apply to LD 35 and others. Some USB-C meter are quite wide:
Or you could use a small extender, like this:
https://www.amazon.com/Extender-Cellularize-Lifeproof-Otterbox-Nintendo/dp/B07MBWH7QG/ref=sr_1_3?dchild=1&keywords=usb+c+extender&qid=1601553850&sr=8-3
Extender may add some amount of resistance.
Some time before, I bought an adapter that allows interchanging with the various types of USB (mini-USB, micro-USB, lightning, etc). So I can try mixing and matching when testing some stuff. But when I do some measurements, they do add quite a fair bit of resistance (ie. current or voltage may not be that correct measurement anymore)… Although the adapter I used could have higher resistances…
Of course, even the meter will add a little bit of resistance. You can measure the extender resistance first with and then without it. But it would be great if you could connect directly from point A to point B.
The too close ports is something than happens even on computers. Old MacBooks 13” had way too close ports, and even in 17.3 MSI notebooks ports are close enough that if you connect USB-A meter on one port it already partially blocks the next one.
I am new here and looking for a solid USB tester (for USB C and USB A chargers and cables). Two quick questions: where can one buy a genuine ZY1280M (seems like there are some fake ones floating around)? And also are there any comments on the AVHzY CT-3 (same as KT002 / YK001 / UT18) and how it may be better than/differ from ZY1280M?
Any other recommendations?
Thank you all!