[time-nuts] measuring currents on USB powered devices

[jimlux]

On 12/21/19 12:11 AM, 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.

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 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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