I am going the DIY route on this one.  I ordered the hardware and will build a little tester.  No fancy readout or otthr circuitry, just a way to access the 5V for voltage and current readings.  My total cost should be a couple of bucks.  I did look for the price on those units you show but didn't see it; I can research that. Bob K6DDX On Saturday, December 21, 2019, 09:45:22 AM PST, jimlux <jimlux@earthlink.net> wrote: On 12/21/19 12:11 AM, nuts@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. Interesting.. I'm not sure whether "easy to switch between Chinese and English" is a good thing or a bad thing <grin> > > 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@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. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and >> follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

The microusb on the side I assume does the external power. On Sat, 21 Dec 2019 13:03:46 -0500 Ken Winterling <wa2lbi@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@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@lazygranch.com > > <nuts@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@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. > > > > > > > > > > > > _______________________________________________ > > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > > To unsubscribe, go to > > > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > > and follow the instructions there. > > > > > > > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and > follow the instructions there.