With dual impedance meters, technicians can safely trouble shoot sensitive electronic or control circuits as well as circuits that may contain ghost voltages, and can more reliably determine whether voltage is present on a circuit. While these tools aren't fooled by ghost voltages, they should only be used for testing power circuits or other circuits where the low impedance will not negatively impact or alter circuit performance. Older troubleshooting tools such as analog multimeters and solenoid testers generally have low impedance input circuitry around 10 kilohms or less. This is the desired effect for most voltage measurement applications, and is especially important for sensitive electronics or control circuits. In simple terms this means that when the DMM is placed across a circuit for a measurement, it will have little impact on circuit performance. Most digital multimeters sold today for testing industrial, electrical, and electronic systems have high impedance input circuits greater than 1 megohm. This application note describes what dual impedance and voltage detection are and why it helps to have them built in to your multimeter.
The Fluke 114, 116 and 117 Digital Multimeter (DMM) series offer several features designed to make electrical measurement easier, safer, and more reliable. Fluke virtual demos and product selectors.
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