Cara mengukur tegangan listrik AC dan DC menggunakan multimeter analog dan digital

Summary

This tutorial demonstrates how to measure both DC and AC voltages using digital and analog multimeters. The speaker provides a clear step-by-step guide, covering essential techniques such as selecting the appropriate scale, correctly identifying positive and negative terminals, and handling used batteries. For AC voltage, the video explains how to measure household voltage and the flexibility of AC measurements with reversed probes. Additionally, it includes a detailed walkthrough on using analog multimeters, covering calibration, scale interpretation, and reading results. Perfect for anyone looking to improve their electrical measurement skills.

Takeaways

• 😀 The video explains how to measure DC and AC voltage using both digital and analog multimeters.
• 😀 The first step when measuring DC voltage with a digital multimeter is to set the dial to the DC voltage mode and choose the correct voltage scale.
• 😀 For DC voltage, you need to know the voltage range of the battery or device you're measuring (e.g., 1.5V or 3.7V).
• 😀 The correct polarity should be observed when measuring DC voltage; the black probe is for negative, and the red probe is for positive.
• 😀 If the polarity is reversed, the multimeter will display a negative value (e.g., -1.7V).
• 😀 When measuring AC voltage, ensure the multimeter is set to AC mode, and choose an appropriate voltage range (e.g., 750V for 220V AC).
• 😀 AC voltage can be measured in either direction, and the multimeter will show the same value regardless of probe orientation.
• 😀 The video also covers how to measure single-phase and three-phase AC voltages, with typical readings for each (e.g., 220V for single-phase, 380V for three-phase).
• 😀 When using an analog multimeter for DC measurement, calibration is essential to ensure the needle reads zero before use.
• 😀 Analog multimeters are less precise than digital ones and are best for approximate voltage readings, especially when using higher scales like 1000V.
• 😀 Proper care is needed when measuring AC voltage with an analog multimeter to prevent damage from using the wrong scale or setting.

Q & A

What is the first step in measuring DC voltage using a digital multimeter?

The first step is to set the selector switch to DC voltage mode on the digital multimeter, and then choose the appropriate voltage scale based on the expected voltage, such as 20V for a 1.5V battery.

How can you determine the polarity when measuring DC voltage with a multimeter?

The polarity is determined by the markings on the multimeter probes. The black probe is used for the negative terminal, and the red probe is used for the positive terminal. The readings will indicate the correct voltage if the probes are connected correctly.

What happens if the probes are connected in reverse when measuring DC voltage?

If the probes are reversed, the digital multimeter will display a negative value. This indicates that the polarity is incorrect, but it won't damage the multimeter.

Why does the measured voltage for a used battery show a lower value than its rated voltage?

The measured voltage of a used battery will often be lower than its nominal value because the battery's charge has decreased over time, leading to a lower output voltage.

What is the correct way to measure AC voltage using a digital multimeter?

To measure AC voltage, you need to set the multimeter to AC voltage mode, choose a scale (such as 750V for household AC), and then connect the probes to the AC source. The display will show the voltage value.

How do you measure AC voltage if the multimeter shows a negative reading?

In AC voltage measurement, polarity is not significant, so whether the probes are connected in reverse or not, the display will show the same value. The negative sign doesn't affect the measurement.

How can you measure the output voltage of a 3-phase system using a multimeter?

To measure the output voltage of a 3-phase system, you measure between the three phase terminals. The voltage between two phases will be around 380V, and the voltage between any phase and neutral will be around 220V.

What is the process of using an analog multimeter to measure DC voltage?

To measure DC voltage with an analog multimeter, first calibrate the meter to ensure the needle is at zero. Then, set the scale to the appropriate voltage range, such as 10V for a 1.5V battery, and read the value indicated by the needle.

What are the limitations of using an analog multimeter compared to a digital one?

An analog multimeter may not provide precise measurements like a digital multimeter, especially when measuring low voltage values or fluctuating signals. The scale reading also requires interpretation based on the position of the needle, which can be less accurate.

How can you prevent damage to an analog multimeter when measuring AC voltage?

When measuring AC voltage with an analog multimeter, ensure the scale is set to an appropriate value (e.g., 250V). Incorrect scaling or using the wrong setting can damage the meter or cause inaccurate readings.