[time-nuts] measuring currents on USB powered devices

[nuts at lazygranch.com]

http://budgetlightforum.com/node/68829
https://lygte-info.dk/review/USBmeter%20USB%20Energy%20Meter%20J7-H%20%28Hidance%29%20UK.html
I managed to find one of these that was bench tested. (Note sample of
one.) Not great, but perhaps good enough. The interesting thing is this
one has bluetooth os you can interface to phone or PC. I noticed the
Android app is a side lode. ;-)

The person testing it managed to blow it up with a 5A load. 

On AliExprese the "manufacturer" is HiDance. Look for J7-H. 

I provided both links because the .dk url looks a little odd. However I
have used that person's battery capacity tests. Seems like a decent
bench tester. 
https://lygte-info.dk/


On Wed, 4 Dec 2019 08:56:25 -0800
jimlux <jimlux at earthlink.net> wrote:

> Any recommendations or brickbats for devices that measure the power 
> drawn by USB powered devices.  I've been using a modified cable that 
> breaks out the red wire to run to a meter, but it would be nice to
> have something that has a ADC and some sort of interface (USB?) that
> would make it possible to log the power draw.
> 
> I've got a bunch of wireless Beagleboards with GPS receivers and
> RTL-SDR pods (to do phased array measurements) and I'm trying to come
> up with better power information.
> 
> (the recent WiFi NTP low power discussion prompts this).
> 
> What would be great is if there were some USB "thru" pod that
> measured this and reported the data over a USB interface (recognizing
> all sorts of isolation issues that are possible), so I could plug the
> USB power "to" the beagle board and the USB power to the RTL-SDR, and
> log them both.
> 
> 
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