Here is a step-by-step guide of using an analog voltmeter:
1. Check the Range and Polarity
First, look at the range selection switch on the dial and make sure we’ve chosen the right voltage range (for example, 20 V or 200 V).
When using an analog voltmeter, you also need to pay attention to polarity. For DC measurements, connect the red probe to the positive side (+) (higher potential) and the black probe to the negative side (-) (lower potential). If the probes are connected incorrectly, the pointer will deflect in the opposite direction and may cause damage to the meter.
2.Connection and Measurement
After connecting the probes to the circuit we want to test, observe how the pointer moves on the dial. To read an analog voltmeter, we need to look at where the needle points on the scale and estimate between the markings to get a more accurate value. Unlike digital meters that show the number directly, reading an analog meter usually requires a bit more judgment and experience.
3. Analyzing the Results
Since an analog voltmeter shows voltage with a mechanical pointer, it can clearly reflect instantaneous voltage changes, like fluctuations or pulses. This makes it very useful when we want to observe how the voltage in a circuit changes over time, which digital meters usually can’t show as clearly.
