Umm I thought that most VOM/DVM's had a capacitor in series with the input... This ensures that only the ac component is measured.
True, to a point. Don`t expect much from a Harbor Freight type of meter. Depends on the quality (price) of the multimeter (DVM/VOM). More expensive meters do a better job. But for automotive use, were are primarly stuck with the cheaper units. Very little AC involved. Cheaper and older units use averaging counting methods as opposed to the more sophisticated sampling methods. They average highs and lows without displaying the deviation. You don`t know when there has been a dip or a spike . Peak/hold meters (higher end more expensive meters) capture and hold and then display the highest/lowest reading, instead of averaging. They can be programmed for specific hi and low variations. Some even have print outs over a specified time period. (ie power line monitors) This works well for capturing digital pulses, spikes, circuit loading. Fluke, as you are probably aware of, makes both high quality and mid quality units. A few low end units. One of their models is made for auto technicians. Most of their models are designed for touchy computer circuits. They also have one sweet digital display unit that gives digital readouts and also shows waveforms in a compact handheld device. Kind of like a handheld digital o`scope. Nice, but very very pricey.
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