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?

molitar wrote:

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

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

Other choices:
http://budgetlightforum.com/comment/1359941#comment-1359941

angerdan wrote:

That’s my classification:

wireless data/professional
Electronic load ZKE EBD-USB+

display/advanced
Electronic load 35W 3A with OLed display J7-f
RD Electronic USB load LD25

variable current/multiple use
USB Load 4-13V 3A
YZXStudio Load ZL1000

fixed current/cheap
USB Load resistor 1A
USB Load resistor 1A-2A usb output
USB Load resistor 1A-2A
USB Load resistor 2.2-4.7-10-20ohm with fan
USB Load resistor 2.2-4.7-10-20ohm
USB Load resistor Juwei 2.5-5-10ohm

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.

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.

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

Video review about the YZXStudio ZY1280 from dodge_911:

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

New models out: RD T66 & TC66C

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?

xnode wrote:

New models out: RD T66 & TC66C

Got the TC66C incoming for a video

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).

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.

I dunno man, https://item.jd.com/36832086035.html and https://www.hypershop.com/products/hyperjuice-87w-dual-usb-c-charger-wit... both advertise 40W over USB A.

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

Nice.

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

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.

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.

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.

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.

I’m ready to graduate from the more typical cheap, hard-to-read USB meter I have and onto something better, like an RD UM25 or UM34. Now trying to decide between the two.

I may be missing something, but on balance, I can’t discern why the UM34 would be favorable over the UM25, given the small price difference.

Am I missing something? Are there testing scenarios that escape my mind for which the UM34 is suitable but the UM25 is not?

The UM34 supports Dash Charge/VOOC protocols.

BlueSwordM wrote:

The UM34 supports Dash Charge/VOOC protocols.

According to RD’s own comparison table, they both do, and the UM25 supports Huawei’s fast charge protocols in addition.

That would be a minor consideration anyway, since I don’t envision a device that utilizes yet another proprietary fast charging standard in my future. I’m fine with USB PD and hope that’s where it will be centered. QC has enough critical mass to continue, and QC4 will have PD compatibility, which will help.

On paper, the 25 is superior in almost every regard, except that it has a USB 2 and not USB 3 port, but I’m not sure how relevant that is when these meters are only taking power measurements.

That’s why I’m puzzled.

By my testing, only the UM34 supports Dash Charge/VOOC charging via a USB-A port.

BlueSwordM wrote:

By my testing, only the UM34 supports Dash Charge/VOOC charging via a USB-A port.

Thanks. Those are the kind of nuances I seek.

The sales material associated with the early reviews of the UM25 did not indicate that support like the current table does, so I guess it was added to the UM25 in an update at some point.

Do you have the C version? I figure it’s better to have it, than regret not getting it, but the mention of ads in the smartphone app would be a bummer.

Yes, I do have the UM25C, UM34C, and recently acquired the TC66C.

Only the UM34C supports Dash Charge due to the additional pins of the USB 3 connector on that meter.

No ads in the smartphone version.

I’ve already received the RD TC66C, however when I connect it between the charger’s cable and the smartphone, it doesn’t charge:

If I connect the YZXStudio between the wall charger and the cable it charges to 1.7 amps aprox. Where could the problem be?

Does anybody know how to contact RD’s tech support? On AliExpress’s page there isn’t any email available.

RD TC66/TC66C Type-C PD trigger USB-C Voltmeter ammeter voltage 2 way current meter multimeter PD charger battery USB Tester