Comment by mardifoufs
2 years ago
Hahahahaha yes I realized it was a bit stupid as I was writing it.They only mention having 24pin interfaces, not testing though I don't see how they could do one without the other, or how it would support 120w passthrough without those pins being connected! But it's AliExpress! One of my favorite online stores, but you absolutely have to always double check what you buy.
Still, more trustworthy than buying more niche electronics from Amazon imo.
> I don't see how they could do one without the other, or how it would support 120w passthrough without those pins being connected!
I'd imagine simplest one would be just to... passthru pins and leech off power at whatever voltage other device is commanding.
Testing cable is a quite bit more complicated on top of acting as "PD analyzer" and if it isn't advertising it it's probably not doing it.
It does meter the power being used though. It logs power usage and can measure resistance. You are 100% right that actual cable testers are much more capable but wouldn't that be enough to know if the cable can handle the wattage that it advertises? Wouldn't a bad cable have high resistance, or missing emarker tags (they can lie about this though) ?
For data transfer that wouldn't be a good metric though, so again you are right!
Well, it's definitely very useful device and it also seems to have cable resistance which is rare in this. I had some other FNRSI devices and they generally feel pretty solid, if UI/UX crippled a bit.
And maybe it won't just stop working like the one I bought did...
Which makes me sad because it was somewhat of an unique product because outside of the "chinese USB tester functions" (paging thru what negotiation succeeded and monitored voltage) it also had little buck-boost converter so I could use it as power supply (for example connect to bog standard 5V USB and boost it to 12V or current limit it).
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