I don't know whether it is AC or DC voltage, how do I measure it with an electrician's multimeter?
If the AC and DC voltage range of the multimeter and the AC and DC type of the voltage being measured are correct, when measuring the DC voltage, the digital multimeter will display the - sign, and the pointer of the pointer multimeter will swing in the positive direction.
The DC voltage setting of the digital multimeter when measuring the AC voltage will give a very small or basically zero reading, and the pointer multimeter measuring the AC voltage in the DC voltage range will also have a very small or no swing when measuring the AC voltage. The same is true for measuring DC voltage using the AC voltage setting of a multimeter. At this time, you should realize that the voltage type being measured is incorrect, and you should reselect the correct AC and DC voltage type range of the multimeter.
In addition, when the level of the power supply voltage to be measured is unclear, the high voltage level and then the low voltage level should be switched gradually to the level with the most appropriate reading resolution and the most accurate reflection of the measured value to ensure safety.
You can first measure with an AC voltage of 750V and look at the displayed value. If it is very small or does not display at all, you can use the DC voltage level to test!
First use the maximum AC voltage for measurement. After determining the range, use the appropriate range for accurate measurement. If the stable value cannot be found, it is DC. Change to the highest DC voltage to measure the approximate value. After determining the range, change to the appropriate range for accurate reading.
Use the maximum AC voltage level to measure the positive and negative voltages once each. If the two voltages are consistent, it is AC, otherwise it is DC~
AC electricity has no positive and negative poles; DC electricity has positive and negative poles.
This is a common sense for using a multimeter correctly. When you want to measure the voltage of an unknown power source, set the multimeter to the maximum AC voltage range, and then adjust the range to the appropriate range based on the approximate measurement results to make accurate measurements.
It's very simple. Use a mechanical multimeter, start from the maximum gear and downshift to measure, use AC gear and DC gear to measure respectively. If the AC gear cannot measure, the DC gear can measure direct current, and the same is true in reverse. Actually, you can judge whether it is AC or DC through the device structure pins.
