Inverter microwave power supplies are effectively continuous at the
power selected. They don't switch on/off in the way that conventional
power supplies do, although they do use pulse-width modulation to
control the power.

This is from http://educypedia.karadimov.info/library/Inverter.pdf
"Inverter Technology In inverter-equipped microwave ovens, the power
transformer is replaced by a circuit board, which converts the 60Hz
incoming line frequency to a variable rate of 20 KHz to 45 KHz. A
relatively small transformer is then required to increase the voltage to
the level required by a magnetron. By varying the pulse width, the
output power can be linearly controlled for more precise cooking and
defrosting levels. The bulky power transformer is replaced by a small,
lightweight circuit board; and, because less heat is dissipated, power
efficiency is increased. Conventional technology uses just a single
power level, which is regulated by switching pulses. In contrast,
inverter technology directly controls the power output. This constant
soft penetration of microwave energy prevents the common problems of
shrinkage, overcooking, and loss of nutrients. The result is even food
temperature and textures throughout."

--

Jeff

On 15/05/2021 08:57, Brian Gaff (Sofa) wrote:
There is no such thing as low power on a Magnetron, they simply put it on
and off to simulate the lower energy over time so to speak.

Is the filament reading OK?

Also, I was intrigued by the diode being such a poor conductor in one
direction, in your previous post. However as you have not actually killed
yourself yet, my guess is there is no eht for whatever reason.
Brian