8-26C1 B
Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following:
A. You need to know where the filter capacitors are so they can be discharged.
B. If it does not use a line isolation transformer you may destroy the supply with grounded test equipment.
C. It is not possible to cause a component failure by using ungrounded test equipment.
D. So that measurements can be made without referring to the schematic.
