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How to measure dc offset
Purchase a multimeter.
A multimeter is a handheld device for measuring electrical current, resistance, or voltage. Multimeters are available in either digital or analog models, and can sport a variety of different features.
The important consideration when choosing a meter to measure dc offset is the lowest available voltage range. Because dc offset readings will be quite small (usually under 100 mv), you need a meter with a small range (sensitivity) so that the readings will register correctly.