What check must be made before installing a meter?

Before installing a meter, it is essential to check the polarity. This check is crucial because the correct polarity ensures that the electrical connections are made properly, which allows the meter to function accurately and safely. If the meter is connected with incorrect polarity, it could lead to incorrect readings, damage to the meter, or even hazardous situations.

Understanding polarity is vital when working with electrical systems. It refers to the direction of current flow in a circuit. When connecting a meter, particularly in AC systems, ensuring that the leads are connected to the correct terminals is necessary for accurate voltage readings and operational safety. For example, if a voltmeter is connected in reverse, it may not provide a valid measurement and can damage the instrument.

Other checks such as current, resistance, or power might be important in different contexts or specific applications but do not come before the initial installation to verify that the meter is set up correctly. Ensuring proper polarity takes precedence to establish a reliable connection right from the start.