How do you test a Switched mode power supply using analog multimeter?
A: A VOM can measure the voltage across the load. To test the current if the current surpasses the VOM range just add a very small resistor in series with the load and use ohms law to find the current since you have the voltage drop.
Unless you set the voltmeter to a reading scale equal to or above the supply, you will at the very least blow the meter's fuse(s), and at worst - only too common - destroy the meter. Info for digital multimeters: If you are using a multimeter to just measure the voltage from your power supply, then you can connect it directly to the + and - of any of the rails. (it wont harm the…
A multimeter draws next to no current, so will not effectively test the power supply under load. The voltage on the meter is averaged out and so will not show ripple current, or spurious dips in the supply. You will need an oscilloscope to check for ripple current (poor smoothing) and the supply needs to be under a load.