[time-nuts] measuring currents on USB powered devices

[nuts at lazygranch.com]

Only 73 vendors on Aliexpress. ;-) And 6 digits!

I noticed the Amazon page says only 3 left. The BBC did an article on
that. Apparently the webpage generates a random number. That said, I
bought some shoes with only one pair left, liked them, went back to the
website, and none available.

On Sat, 21 Dec 2019 11:00:34 -0600
Patrick Murphy <fgdhrtey at gmail.com> wrote:

> 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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> >
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