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

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molitar
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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.

BlueSwordM
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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-Displa...

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.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

molitar
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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?

angerdan
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BlueSwordM
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There is a choice for the HD35+UM24C in the link above that I provided.

It’s a really useful tester, as it can trigger protocols like QC 3.0, and can draw up to 35W of power if the port can output it.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

molitar
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BlueSwordM wrote:
There is a choice for the HD35+UM24C in the link above that I provided.

It’s a really useful tester, as it can trigger protocols like QC 3.0, and can draw up to 35W of power if the port can output it.

Awesome thanks.. Got the tester and load ordered.

BlueSwordM
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BTW, guess what I just found:
https://www.fasttech.com/products/1023/10048999/9654020

A QC 3.0 to VOOC/Dash Charge converter.

Meaning we can now have powerbanks with Dash Charge Wink

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

angerdan
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Video review about the YZXStudio ZY1280 from dodge_911:

EdT
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There is now also several UM25 clones which are several dollars cheaper than the RuiDeng UM25/25C that are selling for the cost of a UM24, but the AliExpress sellers don’t mention if it is the UT25 or UT25C with Bluetooth options:
DIY More UT25/25C

Also there seems to be another new company selling a unit similar to the UM25 I have never seen before selling on Banggood:
Tese

xnode
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New models out: RD T66 & TC66C

PHeller
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I recently bought a J7-c “4-way” USB Digital Tester and I can’t seem to find anything that’ll put out more than .7 amps. Even my wall chargers listed as 2.1A won’t do it (to my iPhone 8) nor will a battery saying 2.1A output.

Do I need a special cord for my iphone to draw 2.1A?

dodge_911
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xnode wrote:
New models out: RD T66 & TC66C

Got the TC66C incoming for a video Smile

chx
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So if I gather correctly, the ZY1280 can convert QC to PD 2.0? That’d be pretty nice. Any other device with a similar feature but a simpler to use UI? These single button devices are not my favorite.

This would allow reusing all the useless QC ports… the LVSUN LS-PD87-2C / HyperJuice 87W alone would charge both of my laptops and my phone (45W, 30W, 15W, all USB C).

BlueSwordM
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See, the problem is that it’s power limited.

QC Type A chargers, which encompass almost all of the chargers on the market, are limited to 18W output, which would only be useful with some low power USB PD devices like the Pixel.

Something like QC 4.0 would work, but the protocol already includes compatibility with USB PD, so that’s not useful.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

chx
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BlueSwordM
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Oh that’s the second QC 3.0 Type B charger that I’ve seen.

Nice.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

chx
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Excuse me, what…? QC 2.0 had a Class B , QC 3.0 had no thing/ What I am missing?

BlueSwordM
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There are type A and type B QC chargers.

Before USB PD was more standardized, there were different types of QC 2.0/3.0 chargers.

Type A on 2.0/3.0 was limited to 18/24W.

Type B on 2.0/3.0 limit was raised to 60/100W.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

will34
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Considering how quickly usb-C PD is getting standard on laptops and phones, I don’t think USB-A would stay relevant for long for high power charging.

PD is getting things straighten up and more and more reliable chargers are coming to the market. Gone are the days where PD power supplies would maintain high voltage output even after cable reconnect which was the #1 reason for device failures. Most chargers now won’t even put out 5V unless communication with receiving device has been enabled and PD direction has been set.

I have a surface pro 6 which I use a Chinese engineered adapter to charge with a PD adapter and USB C cable. It works by “tricking” the power supply to put out 15V. It’s been working great so far.

Many phones have skipped any other type of quick charging technology and do the jump to PD directly, like iPhones. However data transfer protocols over USB-C is still a big ugly mess and would probably take a few years for most devices to standardize.

I have on the way the new zendure Supertank and Superport, both offering 100W PD 3.0. The powerbank its a bit of overkill because at highest output I would drain it completely in less than an hour. And because it was designed for these large loads, it’s not very efficient at lower power drain levels. I plan to review it when it arrives but I don’t really have the tools for a super detailed review. This is why I haven’t bothered to work on a omnicharge ultimate review either, great device btw, extremely versatile.

chx
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Well, from what I have seen phones go in every direction but USB C PD. Like, Huawei released a 10V 4A (WTF?) charger last fall — I guess 12V 3A USB C PD wasn’t good enough? There’s all that crap Oppo pulls off… And did Samsung stop their bullshit USB A QC – over USB C charger as they did with the Galaxy Book 12? That was some major standard breaking sorcery I am telling you.

Laptops, yeah, those have standardized on USB C PD very quickly.

EDCba
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PHeller wrote:
I recently bought a J7-c “4-way” USB Digital Tester and I can’t seem to find anything that’ll put out more than .7 amps. Even my wall chargers listed as 2.1A won’t do it (to my iPhone 8) nor will a battery saying 2.1A output.

Do I need a special cord for my iphone to draw 2.1A?

You need a “good” cable, but most cables can do it. The thing is, 2.1A is the peak, and phones might only use it for initial charging (<50%). I think I’ve only seen the X series go above 2A. My 7+ maxes out at about 1.8A.

xnode
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EDCba wrote:
PHeller wrote:
I recently bought a J7-c “4-way” USB Digital Tester and I can’t seem to find anything that’ll put out more than .7 amps. Even my wall chargers listed as 2.1A won’t do it (to my iPhone 8) nor will a battery saying 2.1A output.

Do I need a special cord for my iphone to draw 2.1A?

You need a “good” cable, but most cables can do it. The thing is, 2.1A is the peak, and phones might only use it for initial charging (
Most quick charge phones charge at 1.7A up to 80-90%. The iPad Pro charges at more than 2 amps until 90% or so.

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