Products > Test Equipment
USB current/voltage monitor with mA resolution?
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ebastler:
Well, "Test Equipment" is a big word for this, but it's probably the right category... I bought one of those cheap, no-name USB dongles which measure voltage and current going to a connected device. Turns out that, while its display resolution is 10 mA, it does not detect a 50 mA current at all, which is a bit disappointing.

Can anyone recommend a gadget which actually works? 1 mA resolution would be neat, but 10 mA with the ability to actually measure from 10 mA onward would be ok too. Does the UNI-T UT658B live up to its "0 to 3.5A" spec, or are there other products which have worked well for you? Thank you!

If I get a choice I would prefer a version with a small "pigtail" cable over the all-in-one dongle style, by the way. Less strain on the computer's USB connector, and does not block any adjacent ports.


AVGresponding:
Mine is just a cheap-as-possible Keweisi with 10mA resolution, and though it will register loads lower than 50mA, I wouldn't have much confidence in the accuracy, since it's the LSD and likely at least a count or two either way anyway.

The one Big Clive uses has 1mA resolution iirc, something like this: https://www.ebay.co.uk/itm/394032196307.
These also allege a 1mA resolution, but the low price would make me suspicious, might have to leverage eBay's buyer protection:  https://www.ebay.co.uk/itm/255742466524.

There don't seem to be many on a lead, surely you can just use a USB A extension cable though?
tszaboo:
I have a RUIDENG AT34 for self made  USB stuff at work. It's OK, the display is small. Get a USB extender cable for it if the format bothers you. Haven't tested the accuracy as it's not really critical, measured 9mA on some stuff plugged in.
skander36:
There are a lot of USB testers that can be used for monitoring, and claim that can show uAmps.(attached)
I am using a cheap USB tester that can show a 5 mA current from a RPI Pico.


Hawaka:
I have an UM25C usb tester. Bought because of the extra digit and it claims 100uA resolution. Never checked it against a proper multimeter, but small variation in my circuit are display as small variation in current, so I guess it's not all that wrong. Never used the app tho.

I just check the manufacturer (joy-it) and their USB-C meter claims 10uA resolution, would be interesting to see if that claim hold.



Edit: corrected current resolution, thanks egonotto for noticing the typo.
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