although for data or some function, it is not better than YZX meter, but for the price , it is already best …
for USB load, there are many choice , LD25/LD35
If someone need more cheaper meter, but colorful display, there is also choice AT34
Also, after reading your testing methodology, I still cannot understand how you perform the “USB coding test” to determine if it has AUTO CODING capability or not. Is there some device that can test that?
Also besides using an oscilloscope, any way we can test the noisiness of the power supply?
I have a problem testing 4 quick charge at a time and also more than 4 independent ports.
I have ordered one.
YZXStudio ZY1280 and ZL1100 are good for that, then scay for many protocols and list what is supported. Earlier I used a home made device that changed the voltage on the data pins, on the response I could see if it was auto coding.
A AC milivoltmeter, but bandwidth is important, something that just works to a few kHz is not good enough.
What kind of specs should have an oscilloscope for this job? I ask because the price for the cheapest is around 20 USD (DSO138) but I don`t know if is good enough.
You either have to use fully shielded setup (Cable from charger to scope is shielded) or you need to run you scope on batteries. I do the last and some of the noise is common mode noise from the charger.
The scope needs bandwidth enough, 10MHz would be fine for most cases and a input sensitivity that can can see the noise. I usual record two traces, the one I publish and another one with better sensitivity to read the actual noise level.
A USB type C cable round up would be nice where you test several cables off Amazon and gearbest. Data is very limited on these cables and they are very important and overlooked component.
I've seen them also on BangGood with another name, they sent me two to test, but as it is exactly the same as teh RuiDeng, I haven't come around to it;
I did release video's on the UM25 and UM34 in the last couple of weeks, so I'm not posting exactly the same video again soon :)
I see you have some cable reviews around there. I recently had to order a lightning cable for my nephew (a friend of him), but saw that the newer BW-MF10 6 feet cord had been downgraded to 23AWG (from AWG21 in the BW-MF8). I wonder what the hell, it is more expensive and already has lots of sales and 5-star reviews… seriously? That must be a piece of shite for high current transfer, maybe it's time to spank Blitzwolf's ass. Poor morons…
Yeah, don't know why they did that, but when testing them at 2A there's no difference in resistance/voltage drop, so maybe they spent what they saved on the wire on better connectors?
I always recommend the BW-MF8's when (notorious cable-busting) friends ask me for a good lightning cable though, because of the thicker wire, and the construction of the plugs.
According to ElectroDroid application voltage drop calculator, when 2A of current go through 1.8m of AWG23 copper wire load distance the resulting voltage drop is 494.246mV, which already is a higher figure than the one you measured. For AWG21 the drop is 310.834mV, which makes sense considering the additional drop in the connectors. Does this means they probably sent you a cable which doesn't exists (with true AWG21 inside, while the actual consumer product is AWG23) for it to look good in the review? :O
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