Jännitemittari

Jännitemittari, also known as a voltmeter, is an instrument used to measure the electric potential difference between two points in an electric circuit. This potential difference is commonly referred to as voltage. Jännitemittarit are essential tools for electricians, engineers, and hobbyists working with electrical systems. They help diagnose problems, verify circuit operation, and ensure safety.

There are several types of jännitemittarit. Analog jännitemittarit use a needle that moves across a calibrated scale to indicate the voltage. Digital jännitemittarit, on the other hand, display the voltage as a numerical value on an LCD or LED screen. These digital versions are generally more precise and easier to read. Specialized jännitemittarit exist for measuring AC (alternating current) voltage and DC (direct current) voltage, though many modern multimeters can measure both.

To use a jännitemittari, it is connected in parallel across the component or points where the voltage is to be measured. This means the positive probe of the jännitemittari is connected to the higher potential side and the negative probe to the lower potential side. Incorrect connection can lead to inaccurate readings or damage to the instrument. Jännitemittarit are rated for specific voltage ranges, and selecting a meter with an appropriate range is crucial to avoid overload. Safety precautions, such as ensuring the circuit is de-energized before connecting or disconnecting the meter, should always be followed when working with electricity.