Voltmeter use and maintenance method - Solutions - Huaqiang Electronic Network

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Using and maintaining a voltmeter is similar to using and maintaining an ammeter, but there are some key points to keep in mind:

1. When measuring voltage, the voltmeter must be connected in parallel with the circuit being tested. This ensures that the meter does not interfere with the current flow.

2. Because the voltmeter is connected in parallel with the load, its internal resistance (Rv) should be significantly higher than the load resistance (RL). This helps prevent the meter from drawing too much current and affecting the measurement.

3. When measuring DC voltage, always connect the negative terminal (—) of the voltmeter to the lower potential point in the circuit first, then connect the positive terminal (+) to the higher potential point. This prevents damage to the meter and ensures accurate readings.

4. For multi-range voltmeters, if you need to change the range, make sure to disconnect the meter from the circuit before adjusting the range. This avoids sudden voltage spikes or incorrect readings due to improper settings.

Additionally, it's important to store the voltmeter in a dry, cool place and avoid exposing it to extreme temperatures or humidity. Regularly check the leads and connections for wear or damage to ensure safe and reliable operation. Always refer to the manufacturer’s instructions for specific guidelines on calibration and maintenance.