5V and 3.3V Seem high

Arduino Uno R3 SMD 5V output pin showing 7.6V and 3.3V output pin show 4.6V using multi-meter.
When using a 9V get 5.8V and 4V.
Nothing else attached to the Uno.
Same results with USB supplying power vs external adapter.
So is this normal? Is this because there is no load on the device?

No, that’s not normal.

I would first check your multimeter with a known good source.


Probably the battery in your multimeter is flat. That often results in high readings.


Thank you for your replies.

It was indeed the battery in my multi-meter. Guess I was just tired and forgot the obvious.

When in doubt, check the batteries and reboot :slight_smile: