Methods for Measuring Voltage with a Multimeter
The method of measuring voltage with a multimeter first requires aligning the range switch with the five gear range marked with V (for testing AC voltage, align with the gear of AC voltage, and for testing DC voltage, align with the gear of DC voltage). When measuring voltage, the meter probe should be connected to the tested circuit in parallel. Select a suitable range position based on the approximate value of the tested circuit. The maximum value of each dry battery is 1.5V, so it can be placed in the 5V range.
At this point, the full scale reading of 500 on the panel should be taken as 5. Reduce by 100 times. If the pointer is at the 300 mark, it is read as 3V. Note that the value pointed by the range switch tip is the corresponding value of the full-scale reading of the pointer on the meter head. When reading the meter, simply convert it accordingly to read the actual value. Except for the resistance mode, all modes of the range switch should read the measurement results using this method.
In actual measurement, when encountering an uncertain approximate value of the measured voltage, the switch can be turned to the maximum range first, and then the range can be gradually reduced to the appropriate position. When measuring DC voltage, attention should be paid to the positive and negative polarity. If the probe is reversed, the needle will reverse. If you don't know the polarity of the circuit being tested, you can set the range of the multimeter to the maximum setting and quickly test it on the tested circuit to see how the pen needle deflects, in order to determine the positive and negative polarity.
Measure 220V AC power. Set the range switch to AC 500V. At this time, the full scale is 500V, and the reading is read according to the scale 1:1. Insert the two probes into the power socket, and the scale indicated by the probe is the measured voltage value. When measuring AC voltage, there is no positive or negative distinction between the probes.
1. Measurement of DC voltage, such as batteries, portable audio power supplies, etc. First, insert the black probe into the "com" hole and the red probe into the "V Ω" hole. Select the knob to a range larger than the estimated value (note: the values on the dial are all maximum ranges, "V -" represents DC voltage range, "V~" represents AC voltage range, "A" represents current range), and then connect the probe to both ends of the power supply or battery; Maintain stable contact. The value can be directly read from the display screen. If it shows "1.", it indicates that the range is too small, and then a large range needs to be added before measurement. If a "-" appears on the left side of the value, it indicates that the polarity of the probe is opposite to the actual power polarity, and the red probe is connected to the negative terminal.
2. Measurement of AC voltage. The probe socket is the same as measuring DC voltage, but the knob should be turned to the required range at the AC gear "V~". There is no positive or negative distinction in AC voltage, and the measurement method is the same as before. Whether measuring AC or DC voltage, attention should be paid to personal safety and do not touch the metal part of the probe with your hands casually.
