Usb testers

[Gaogier]

Hello

i have a USB -A tester, I am after a USB-C tester now, however am I using/reading the usage correctly or is it faulty parts my end?

So over the years I have acquired a lot of cables for gadgets. I have a 10 litre box full of spare USB-A to USB micro-b and lightning to both usb c and a types.

when testing on the usb-a the mA reads .16 to .22 when testing usb-a to lightning it reads about 1.1 mA

so, does this mean I am reading it wrong, using inferior micro cable type or is it the device I am charging or using a bad tester?

my tester reads mV and mA

here is a link to Amazon Usb reader

 

[RandomGrinch]

Sorry if I have misunderstood your question
Your tester is designed to measure the current draw of a device plugged into the USB supply *.
Using the tester to 'measure' the current draw of a lead isn't really of any relevance.
It may tell you that the lead is working, and it may possibly tell you that one lead could have a different resistance to another, but with a listed +/-1% accuracy on the current range, any small differences you notice are really in the noise.
I also question your measurements - the listed device has a resolution of 10mA, so I don't know how you get a .16mA reading

*Edit, it's also a useful device to check the USB supply under load. I.e. if when a device is plugged in, the voltage drops far below 5V, there may be a fault with the supply, or the device could be causing an overload.

 

[JohnW2]

I also question your measurements - the listed device has a resolution of 10mA, so I don't know how you get a .16mA reading

As I imagine you have also presumed, given the photos of the display, I suspect he means 0.16 A (i.e. 160 mA).

I have to say that I somewhat struggle to think what useful purpose this gizmo might serve

Kind Regards, John

 

[RandomGrinch]

I have to say that I somewhat struggle to think what useful purpose this gizmo might serve

I think you missed my edit.
I thought I would try and give an example of a legitimate use

BigClive tends to use them regularly to weed out dodgy USB power banks with hugely inflated mAh ratings, as well as testing supplies with a variable load - example here if anyone's interested

 

[JohnW2]

I think you missed my edit.

I did.

I thought I would try and give an example of a legitimate use .... BigClive tends to use them regularly to weed out dodgy USB power banks with hugely inflated mAh ratings, as well as testing supplies with a variable load - example here if anyone's interested

Fair enough. However, I don't think that the power banks with ridiculous claimed capacities (up to at least 20,000,000 mAh, with a size that would fit into my palm!) make any claims about current-supplying capabilities, do they?

Kind Regards, John