USB power meter/tester thread - YZXStudio, Power-Z, RDTech and more.

I wonder if the ZY1275 has still been continued…

KM001 is a bit quirky to use, but the graphing is nice, mainly because it is configurable within the settings (1fps, 10fps, 50fps, 100fps).

The ZY1276 graphing screen is actually also configurable, BUT and it’s a big BUT you need to unplug the meter, go to Extended Settings mode (plug the ZY1276 to power source while holding down the button to get to the Extended Settings), then set the graphing rate. Then push the button to exit Extended Settings mode, then the graphing rate will be the one you set. Now if you want to change the graphing speed again, re-do the above procedure (unplug, hold down button, replug), which is very inconvenient when I just want to adjust graphing sample display rate. I hope a new firmware update will incorporate the feature to change the graphing speed within the graphing options screen, and not have to go thru “Extended Settings” mode.

Can anyone give me a quick summary which models from RD and other manufacturers can be used whith an Android/Windows App ?

Dodge,

Per angerdan reply, I would love to know how you are currently ranking/recommending these USB testers, load testers, etc.

On the high end, I was looking at the AVZzY CT-2 (KT001) tester on Amazon @ $77 & YZXStudio ZY1280 @ $ 51 from fasttech.com

On the low end there is the MakerHawk(?Rui Deng clone?) UM34C $29 and UM25C also $29 on Amazon

I also wanted to buy a USB load tester like the one you used in the UM34c video, and there was a MakerHawk USB Load Tester 150W 200V for about $38. Can’t seem to find many other more powerful load tester reviews, though I read up on a few at Lygte-Info.dk.

My usage is primarily moving to QC 3.0 and Power Delivery wall chargers, and testing them to make sure they work correctly w/my various Android/iPhones/iPADS, etc.

Here is the comment from your KT001 video w/the comparisons between the testers from one of the comments.
Zy1276 pros;

- more accurate data (according to a taobao shop)

- faster data update rate

- Bluetooth (pc software is a little bit disappointing)

- frequent fw update (Upgrading fw needs programmer)

- cheaper than kt001
Zy1276 cons:

- can’t powered externally (only works with input voltage higher than 3.5v)

  • upgrading fw needs stlink programmer

Kt001 pros:

- external power over microusb (this enables measuring rom 0v to maximum voltage it can tolerate)

- datalogging

- firmware upgradable over usb

- better pc software
Kt001 cons:

- less accurate

- more expensive

  • firmware updates are less frequent

I was curious if you have determined if these pros/cons are still accurate after more time w/the KT001/1276(1280similar) since u first tested them?

I still use all of them in a lot of videos. For me, every meter has some use.
The ones you mention I use likely the most, but I can't really say that I use one more than the other...
I don't really use bluetooth logging, I don't like it for testing, a hardline connection via micro-usb is preferred.
But since my old testing nettop can't run W10, I stick to my ZKETech's for datalogging.

@dodge_911 and everybody else, there is something I’ve just discovered about the UM25C compared to all of their other meters.

It’s actually their most precise and most accurate meter that they have by a long shot!

Its datasheet specifies its accuracy in ‰, not in %!

That means compared to the UM24C/UM34C/every other meter, it’s 10 times more accurate.

See for yourselves:

UM25C

UM34C

I think you are confusing resolution with accuracy.

Umm what do you mean?

Precision = resolution.

Accuracy = closeness of the measured value to the real one.

As you can see in the screenshot, I was speaking about the ‰ sign actually.

% = part/100

‰ = part/1000

That means the UM25C is quite a bit more accurate than the UM24C.

Oh, I get it now. My bad. That is pretty impressive.

“% = part/100
‰ = part/1000”

Hopefully, what the specs say are really true and not just some typo…

My ZY1270 (/w BT) is dead with an error code 021. It might be that one of the ADC ICs is toast. If anyone is interested in trying to bring it back to life, PM me. You can send me something thats gathering dust in return if you wish.

Found this nice picture:

I bought 2 QC chargers for my Samsung battery, my only quick charging device. Then I found out Samsung uses their own protocol :\

[quote=EDCba]
I bought 2 QC chargers for my Samsung battery, my only quick charging device. Then I found out Samsung uses their own protocol :\/quote]

A lot of chargers support the Samsung protocols (They have more than one).

[quote=HKJ]

Hmm it’s the 9V one, I think the ZY1276 calls it Samsung AFC. At least Baseus doesn’t support it.

[quote=EDCba]
I bought 2 QC chargers for my Samsung battery, my only quick charging device. Then I found out Samsung uses their own protocol :\/quote]

I have a Samsung S9 myself. I measured the charge rate with a ZY1276 and found I was getting the same results if I swapped chargers for my MacBook Pro charger as well as an Anker 5 port charger with USB C and also an Anker 10000mAH power pack that has QC 3.0. Though an earlier Anker power pack that only supported up to QC 2.0 charged at a lower 5V rate. I know my Samsung S9 uses their own charging protocol but also supports QC 3.0. I am not sure about earlier Samsung models.

[quote=Wrongway]

Yeah the battery, EB-PG950, came from a weird time supporting only the proprietary protocol but before the standard ones. I realized when there were no QC markings on it. Early Apple products were like this too, remember when chargers had dedicated Apple ports? The iPod Touch 2 only charged on Apple ports and not DCP.

Hello can anyone advise me on what would be best tester for my needs?

1. Support DASH for Oneplus Phone (seems not many testers actually support Dash)
2. Test cable resistance for Micro USB and USB C
3. Test voltage and current being supplied to the phone
4. Test chargers to make sure they are actually charging correctly (I assume this is what PD Triggers are?)
5. Bluetooth would be nice as it makes it easier to read when using in a charger and screen is facing in wrong direction to wall

Also what would be a good load tester for this as I know it’s required for proper cable testing.

Thanks for any advice as I had already tried one and it did not properly support Micro USB so I had to send it back.

1. Yes. It’s quite rare for meters to actually support Dash Charge Passthrough
2. Yes.
3. Yes. Most meters can do this.
4. Yes and no for USB PD triggers unless you want to pay hundreds of dollars. There is a USB load which can trigger protocols like QC 2.0 and 3.0, but not PD, which is the HD35.
5. Yes. It’s very nice.

The UM24C supports everything you asked for, and has inputs for micro-USB and USB-C, although you can only see if Dash Charge works via the main USB port:
https://www.aliexpress.com/item/RD-UM24-UM24C-for-APP-USB-2-0-LCD-Display-Voltmeter-ammeter-battery-charge-voltage-current/32845522857.html?spm=2114.search0104.3.11.12cd1853mHfnxf&ws_ab_test=searchweb0_0,searchweb201602_1_10065_10068_10130_318_10890_10547_319_10546_317_10548_10696_10084_10083_10618_452_10139_10307_532_204_328_10059_10884_323_325_10887_100031_320_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=1036ce4e-3306-4eea-9458-dc6f1f8c9557-1&algo_pvid=1036ce4e-3306-4eea-9458-dc6f1f8c9557&transAbTest=ae803_5

It’s a really nice meter, and as you can see, it does support Dash Charge:

The 3,5A current to the phone proves it works with Dash Charge, along with OP3 phone connected to it of course.

Thanks for the advice. Watched reviews and it looks easy to navigate unlike the awful navigation of the AVHzY CT-2 I tried. It was a nightmare for me to get to the screens I wanted to get to and all and I will never pick up another single navigation like that system again.

It appears I will need a load tester for cable resistance testing. What model would you recommend?

RD HD35 - it’s the newest model.
https://de.aliexpress.com/item/RD-HD35-Trigger-QC2-0-QC3-0-Electronic-USB-Load-resistor-Discharge-battery-test-adjustable-current/32935083204.html

Here’s a review of the HD35:
http://budgetlightforum.com/comment/1376269
eevblog.com/forum/testgear/trigger-usb-load-hd2535-test/

Other choices: