[time-nuts] measuring currents on USB powered devices

[nuts at lazygranch.com]

The microusb on the side I assume does the external power. 

On Sat, 21 Dec 2019 13:03:46 -0500
Ken Winterling <wa2lbi at gmail.com> wrote:

> 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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