How to measure voltage with a multimeter
The voltage measurement method of the multimeter is to first align the range switch within the five-speed range marked with V (the AC voltage should be aligned with the AC voltage gear, and the DC voltage should be aligned with the DC voltage gear). When measuring the voltage, connect the meter leads to the circuit under test in parallel. According to the approximate value of the circuit under test, select a suitable range position. The maximum value of each dry cell is 1.5V, so it can be placed in the 5V range.
At this time, the 500 of the full scale reading of the needle on the panel should be read as 5. That is 100 times smaller. If the needle points at the 300 mark, it reads 3V. Note that the index value indicated by the tip of the range switch is the corresponding value of the full-scale reading of the needle on the meter head. When reading the meter, you can read the real value as long as it is converted accordingly. Except for the resistance gear, all gears of the range switch read the measurement results in this way.
In the actual measurement, when the approximate value of the measured voltage cannot be determined, the switch can be turned to the maximum range first, and then the range can be reduced to the appropriate position. When measuring DC voltage, you should pay attention to the positive and negative polarities. If you don't know the positive and negative polarity of the circuit, you can put the range of the Wantian meter in the maximum gear, try it on the circuit under test quickly, and see how the pen needle is deflected, you can judge the positive and negative polarity.
The principle of measuring voltage with a multimeter _ how to measure voltage with a multimeter _ how to measure voltage with a multimeter
Measure 220V AC. Turn the range switch to AC 500V. At this time, the full scale is 500V, and the reading is read according to the scale of 1:1. Insert the two test pens into the power supply socket, and the measured voltage value is at the scale pointed by the pointer. When measuring AC voltage, there is no positive or negative test lead.
The principle of measuring voltage with a multimeter _ how to measure voltage with a multimeter _ how to measure voltage with a multimeter
1. Measurement of DC voltage, such as battery, walkman power supply, etc. First insert the black test lead into the "com" hole, and the red test lead into "V Ω". Select the knob to a range larger than the estimated value (note: the values on the dial are the maximum range, "V-" represents the DC voltage range, "V～" represents the AC voltage range, and "A" is the current range), then set the Connect the test leads to the power supply or both ends of the battery; keep the contact steady. The value can be read directly from the display screen. If it is displayed as "1.", it means that the range is too small, so it is necessary to increase the range before measuring. If "-" appears on the left side of the value, it means that the polarity of the test lead is opposite to that of the actual power supply. At this time, the red test lead is connected to the negative pole.
2. Measurement of AC voltage. The test pen jack is the same as the DC voltage measurement, but the knob should be turned to the required range at the AC gear "V~". There is no positive or negative AC voltage, and the measurement method is the same as the previous one. Whether measuring AC or DC voltage, pay attention to personal safety and do not touch the metal part of the test pen with your hands.
