How does a desktop digital multimeter measure voltage?
Preparation
Before using a desktop digital multimeter to measure voltage, you need to make the following preparations:
1. Make sure the power supply is connected. Desktop digital multimeters need to be connected to a power source to function properly.
2. Determine the type of voltage to be measured. Different voltage types require the use of different voltage probes. For example, measuring AC voltage and DC voltage require the use of different probes.
3. Connect the probe to the multimeter. Insert the red and black wires of the probe into the red and black jacks of the multimeter respectively, and make sure the connection is firm.
Measurement steps
1. Turn on the multimeter. Press the power switch and wait for the multimeter self-test to complete, making sure the multimeter screen displays zero.
2. Select the measurement type. Depending on the type of voltage to be measured, select the appropriate measurement type. For AC voltage, you need to select the AC voltage range; for DC voltage, you need to select the DC voltage range.
3. Connect the probe to the circuit under test. Connect the red and black wires of the probe to the positive and negative poles of the circuit under test.
4. Read the measurement results. On the multimeter screen, you can see the current voltage value. If you need to record the measurement results, you can take a photo or record them manually.
5. Turn off the multimeter. After completing the measurement, the multimeter needs to be turned off to save energy and protect the instrument.
Precautions
1. When using a desktop digital multimeter to measure voltage, you need to pay attention to safety issues. Especially when measuring high voltage, you need to ensure that you keep a certain distance from the circuit under test to avoid electric shock accidents.
2. When selecting the measurement type, you need to pay attention to distinguishing between AC voltage and DC voltage. Different types of voltages require the use of different probes and measurement methods, otherwise the measurement results will be inaccurate.
3. During the measurement process, you need to pay attention to whether the screen display of the multimeter and the measurement results are stable. If an abnormality is found, it needs to be dealt with in time and measured again.
4. After completing the measurement, the multimeter needs to be turned off in time to protect the instrument and extend its service life. At the same time, probes and cables also need to be organized and stored properly to avoid damage or loss.
