[time-nuts] measuring currents on USB powered devices

[Richard Solomon]

Check these out over on that auction
site; Item # 112706101220.

I bought 3 of them and they seem to work.

73 es HH, Dick, W1KSZ

On Wed, Dec 4, 2019 at 2:01 PM 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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