[time-nuts] measuring currents on USB powered devices

[Ken Winterling]

Patrick,

I don't have this device but what I like about this one is the ability to
run from an external power supply.  That means the measuring circuit isn't
consuming any current from the device being measured.  That leads to a more
accurate reading.  It also can be device-powered for quick measurements
with less accuracy.  This is the first USB measuring device I've considered
purchasing.

Thanks for posting!

Have a good holiday season.

Ken
WA2LBI





On Sat, Dec 21, 2019 at 12:45 PM 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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