Notes:
A common misconception among students is that the "DC" setting is used for measuring DC signals only, and that the ÄC" setting is used for measuring AC signals only. I often refer to the "DC" setting as direct coupling in order to avoid the connotation of "direct current," in an attempt to reinforce the idea that with "DC" coupling, what you see is all that's really there. With ÄC" coupling, only part of the signal is being coupled to the input amplifier circuitry.