This video indicates that you can check for voltage drop with a Multi-meter!
The test cabinet has a Danfoss BD50 12VDC compressor and this test shows how the voltage read before and as the compressor starts / tries to start will indicate if the power supply is adequate. That is: Is the supply voltage dropping sufficiently to cause the Motor Driver Module to default into either low voltage or over current mode.
A multi meter used this way will not determine if the Motor Driver is faulty or not but it will indicate if there is the possibility of a bad power supply which is a most common cause of compressor failure. This may prevent a Motor Driver being replaced unnecessarily.
Now I don’t have Superman’s eyesight but even I can see and read the voltage drop indicated on the MULTI-METER…. der!