[time-nuts] measuring currents on USB powered devices

[Patrick Murphy]

Here is my personal favorite. This is a USB-C compliant unit. There are
also USB 1 and USB 2 devices available. I find their quality to be quite
acceptable. These are new to me so I cannot speak as to their durability.

https://smile.amazon.com/gp/product/B07T2GKDCG

Merry Christmas to all!

On Sat, Dec 21, 2019 at 10:42 AM nuts at lazygranch.com <nuts at lazygranch.com>
wrote:

> 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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