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Published on: 22 Feb 2017 by mdafjal786
This tutorial will show you how to use a digital multimeter (DMM), an indispensable tool that can help you diagnose circuits, learn more about electronics designs from others, and even test a battery. Therefore the name "Multi" - "Meter" (multiple measurement). The simplest things we measure is the voltage and current. A multimeter is also ideal for some health checks and basic troubleshooting procedures. Your circuit does not work? The switch does it work?
Put a meter on it! The meter is your first line of defense when a troubleshooting system. In this tutorial we will cover the measurement voltage, current, resistance and continuity. The display usually has four numbers and the ability to display a negative sign. Some multimeters have bright screens for better visibility in low light conditions.
The selection button allows the user to read the multimeter to read various things like milliampere (mA) of current, voltage (V) and resistance (?). Two sensors are arranged in two ports connected to the front of the device. COM stands for common and almost always connected to the earth, or '-' of a circuit.
The probe is usually black COM, but there is no difference between the red probe and the black probe other than color. 10A is the special port used when measuring large currents (over 200 mA). MAV? is the port where the red probe is conventionally connected. This port is used to measure the current (up to 200 mA), voltage (V) and resistance (?). The probes have a banana plug at the end that is inserted into the meter. Any probe with banana plugs will work with this counter. This allows different types of probes.