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I have got a power source for my RPi. The manufacturer claims that the output voltage is exactly 5V. However, I would like to measure whether it is true, and I would like to find out how stable it is when I connect other devices. Where it is easiest to measure the voltage with a "needle" volt-metre?
I was thinking about the 5V GPIO pins but I'm not sure if the voltage there is the same as on the input to the device.
Look at this section of the eLinux pi hardware page and scroll down a few inches until you see a picture of someone holding multimeter leads. TP1 and TP2 are stencilled clearly on the board.
Image taken from eLinux.org:
