Is this the correct setting to measure the vref voltage to adjust a trimpot on my A4988 stepper driver?
Is this the correct setting to test this out on a RAMPs 1.4 board?


Well, a RAMPs 1.4 board does not include the stepper driver. So the RAMPs itself does not determine how you set/test VRef.


  Also, does she have the leads plugged into the correct ports?


Is it this you are referring to? Then yes, black probe on ground and red probe on VRef (connected to the trimpot). Although this stepper driver is not A4988 based. (DRV8825 instead)




On an A4988, these are suitable points (basicaly the same):



p.s.: it looks different because on the DRV8825 the trimpot far from the GND pin and on the A4988 the trimpot is close.