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1. Digital multimeters are very high impedance, they therefore draw very little current from the circuit under test. This makes them very sensitive to stray voltages. A voltage reading may not neccessarily mean that there is a useful voltage available on the circuit under test. Take readings other than expected, with a pinch of salt. Understand the circuit under test.
2. A varying, or fluctuating voltage on the circuit under test, is not easy to see from digits. The numbers may just appear to change at random, whereas with an analogue meter, a pulse or variation will be easy to see from the needle movement.
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Do you unplug before measuring resistance?
Yes. Measuring resistance involves imposing a small current through a device and measuring the voltage drop. If there were any other source of voltage, the reading would be in error. You could also damage the ohmmeter if there were an external voltage source. You should also take the device out of circuit before measuring it, so as to not bias the results by the resistance of other devices in the circuit. It all depends on the situation, for which you are responsible for evaluating before you start.
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