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If the volt meter has the feature of measuring and recording / logging the instantaneous value, one can read the values for a specified period. If the meter does not have that capability, some lower models have the feature to record the minimum, maximum, average values occurred during the said period. An ordinary Voltmeter may not have such recording features.

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Q: When you're measuring a power supply's voltage over time. You want to know how much the voltage changes during that period of time. What feature of a digital vom can be used to monitor this?
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