Can someone explain to me what this thing does?

I feel silly for asking but it irritates me to not understand :confounded:

I read through the specs but still don’t understand what it does exactly. What can it tell you that a regular usb meter cannot?

Could be wrong but to me it is a dummy load for testing voltage drop at whatever amps.

Cheers David

Great Scott!

It's a Flux Capacitor!

Me neither. I think It might be from North Korea.

3. The main function of this product is the aging discharge test.
4. In order to better experience the work of the load tester, the product has been optimized to upgrade, even below 3V when the fan will work, and will not damage the goods, because before the customer, at 3V, the current is 4.5A Time, the device will be caused by overheating does not work, so now the fan is the whole process changes with temperature, Promise speed, the greater the power, the faster the fan speed! Cooling better!

I find it amusing…
I think it is basically a tester for QC 2 and 3.0 chargers. Those do some odd stuff while charging if the phone is compatible. Looks like the red stick part will trigger those higher voltage charge rates without phone attached. The double adjustment pots lost me. was funny to read it.

the left picture contains 2 modules, the vertical one is QC trigger module( it sends QC signal to the charger, powerbank, whatever you are testing), so that the output can be above 5v(quickcharge uses high voltage to accelerate the charging time)
the other module is dummy load, which basically wasting all energy, it also come with a screen so that you can know how much energy it has wasted and what is the current and voltage now

Aah, okay I was guessing it was a dummy load but didn’t know what the QC trigger module did.

Once in a while I see someone having use for a dummy load but I’m not smart enough to understand why you would need to do that. I like having a meter between the charger and battery/device. It tells me all I need to know.

Thanks for the answers :student: :beer:

What is said above is right. It would be useful to use on a few things. Power banks/battery banks, USB chargers, Cables.

Test how long a charger can supply a Said load.

Smaller chargers might be Quick Charge 3.0 rated but maybe only for 30 min or so before it gets to hot and drops wattage.

Quick charge 2.0 is like 5/9/12v @ 3 amps i think. I guess quick charge 3 may be able to supply more current now.

I have something similar I bought from AliExpress.

The QC trigger is a separate item, not needed for regular testing 5v.
It can be used to trigger your QC-capable powerbank or powersupply to test load drain at say 9 or 12v.

It’s not a regular USB meter, it’s more of a USB load tester (apply a load to your power bank or charger) to test how much voltage sag under specified load. Can be used to test power bank’s capacity at your specified load.

I’m waiting for the HKJ review…

The QC trigger can be a cool stuff for some DIY project, if cheap enough of course. Any product links, d_t_a?

Cheers :-)

I mess around with one for Lightning cable tests, and sometimes use it in charger tests on my YT channel...
If you want to see it in use, check this video :
www.youtube.com/embed/dvQC-xuiWcI
I use both products there, to test the output of a charger...

And at the end of this video I mess around a bit with the QC enabler :
www.youtube.com/embed/Jzb22p422uo

Here's one : https://www.banggood.com/JUWEI-QC2_03_0-Automatic-USB-Tester-Voltage-Ammeter-Quick-Charger-Power-Bank-Voltage-Trigger-p-1193891.html

A short simple and boring video of using the QC2/3 trigger board to trigger 5/9/12/20v from a QC3-capable charger:

This thing in the OP, can it be used to check the output of an led driver?

Yes, a unit like that is a combination of a USB multimeter, usually to monitor voltage, current, et-al, and can also provide it’s own load (the model I have will pull up to 35 watts).
It is very handy for stress testing USB ports on an old computer or laptop, and also for stress testing those USB “power pods” people have for recharging their phones to see if it is time for a new unit or if the batteries are okay.

So if you are charging something, you can put this “in the middle” as a meter.
If you have nothing to charge, or have a “suspect” USB item you can attach this and set a load to test the charger/power bank/etc.

I figured as much but wanted to check first. Thanks zespectre :+1:

Sometimes I want to test a driver but don’t have the right led (or leds) set up to do the check.

I bought one, as I wanted to know whether my USB charger can really supply 2.4A per channel, and to test the accuracy of my existing voltage meter.

(When I turned up the resistance, the current seemed to level out at around 4.4A and it seemed wise to abandon my test!)

I’d also like to see a test from HKJ.

You can change the language interface from Chinese to English (and vice versa) by quick-pressing the button 6 times consecutively.