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All voltmeters have a high measuring impedance so they do not affect the circuit under test by loading it. Look up the specs for your meter. It is usually found right on the meter face itself. It should say something like 10,000 ohms/volt or 20,000 ohms/volt. That means that the input resistance of the meter is that number times the full scale reading selected. If you have a 20,000 ohms/volt meter and you select the 100 volt scale the resistance is 20,000 X 100 or 2 million ohms.

[QUOTE="Captain Kilowatt, post: 423597, member: 39"] All voltmeters have a high measuring impedance so they do not affect the circuit under test by loading it. Look up the specs for your meter. It is usually found right on the meter face itself. It should say something like 10,000 ohms/volt or 20,000 ohms/volt. That means that the input resistance of the meter is that number times the full scale reading selected. If you have a 20,000 ohms/volt meter and you select the 100 volt scale the resistance is 20,000 X 100 or 2 million ohms. [/QUOTE]

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