On 25/06/2017 16:03, James Wilkinson Sword wrote:
My microwave turns off the magnetron 15 seconds before the end of the
timer. What's the reason for this?

Do you mean it pings/beeps and the light goes out at the 15 second
point? I assume you have a fancy microwave with a digital timer rather
than a simple rotary knob like mine. All the same, I think mine stops at
the correct time as far as I can tell.

--
Max Demian