On Sun, 03 Feb 2019 17:30:20 +0000, Markus Robert Kessler wrote:

> I am using such a device
>
>     https://www.amazon.com/PowerJive-Voltage-Multimeter-chargers-
capacity/
> dp/B013FANC9W
>
> between power supply out and raspberry power in.
>
But where is it in relation to the power cable?

Since it has regular sockets I'm guessing you've connected

Wall      Power
plug ---> supply -> Powerjive --cable to RPi--> Pi 3B

in which its (correctly) showing that the PSU is giving 5.01 volts
but will not see any voltage drop in the cable connecting it to the RPi.

This is the cable that people ate telling you to check or just replace.

To measure the voltage into to the RPi you need to put the meter between
the cable and the RPi but, as this uses microUSB connectors which the
Powerjive does not have, you'd also need USB B -> microUSB adapters on
either side of the PowerJive. Since yoyu don't mention them, I assume you
don't have any.


> So, I see exactly what RPi gets. With the same voltmeter I then checked
> the (2 out of 4) USB ports on the RPi.
>
Nope - because you are ignoring voltage drop in the cable.

> The funny thing is, meanwhile I found a power supply which was part of a
> "Raspberry 2 starter kit" from Vilros. This one delivers 5V and 2A also,
> but in reality, there are 5.37 Volts without load, measured with the
> device above.
>
Thats quite normal. Many PSUs show an overvoltage when only tiny currents
are being output. Even pulling 100 mA from such a PSU will reduce its
output voltage to under 5.1v


--
Martin    | martin at
Gregorie  | gregorie dot org

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