I don't know if it's AC or DC voltage how to measure it with an electrician's multimeter.
Multimeter AC and DC voltage gear and the measured voltage AC and DC type if correct, when measuring DC voltage, digital multimeter will show - number, pointer multimeter pointer will swing in the positive direction.
The digital multimeter DC voltage file measuring AC voltage reading will be very small or basically zero, the pointer multimeter DC voltage file measuring AC voltage swing is also very small, or no swing. Multimeter AC voltage gear DC voltage measurement is also the same. At this point should be aware of the measured voltage type is not correct, should be re-selected multimeter correct AC and DC voltage type gear.
In addition, for the power supply voltage to be measured is not clear, should be the first high-voltage gear after the low-voltage gear gradually switched to the most appropriate reading resolution, the most accurate reflection of the measured value of the gear to ensure safety.
You can first measure with AC voltage 750V, look at the display value, very small or basically does not show, you can use DC voltage gear test!
The first AC voltage when the maximum measurement, to determine the range in the appropriate range for accurate measurement, if the reality is not a stable value is the DC, DC voltage into the highest level of measurement of the approximate value, to determine the range of the range into the appropriate range for accurate readings!
Use the maximum AC voltage gear first positive and negative measurements once, if the two voltages are the same AC, and vice versa is DC ~!
AC does not have positive and negative poles; DC has positive and negative poles.
This is the correct use of the multimeter a common sense, when you want to measure the voltage of an unknown power supply, the multimeter to the maximum AC voltage gear, and then according to the approximate results of the measurement of the gear will be adjusted to the appropriate gear, to make accurate measurements.
It is very simple, with a mechanical multimeter, from the largest gear to start gear reduction measurements, respectively, with the AC block and DC block measurements, while the AC file can not be measured, DC file can be measured is the DC power, the opposite is also the same. The actual structure of the device through the pins can be judged by its AC or DC.
