How to measure voltage and current levels with a digital multimeter
How to measure voltage range with digital multimeter
1. Measurement of DC voltage, such as batteries, walkman power supplies, etc. First, insert the black test lead into the "com" hole and the red test lead into the "V Ω" hole. 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" represents the current range), and then Connect the test leads to both ends of the power supply or battery; keep the contact stable. The value can be read directly from the display. If it is displayed as "1.", it means that the measuring range is too small, so it is necessary to increase the measuring range before measuring industrial electrical appliances. If "-" appears on the left side of the value, it means that the polarity of the test lead is opposite to the actual power supply polarity. At this time, the red test lead is connected to the negative pole.
2. Measurement of AC voltage. The test lead 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 distinction between AC voltage, and the measurement method is the same as before. Regardless of whether you are measuring AC or DC voltage, you must pay attention to personal safety and do not touch the metal parts of the test leads with your hands.
How to measure current level with digital multimeter
1. Measurement of DC current. First insert the black test lead into the "COM" hole. If you measure a current greater than 200mA, insert the red test lead into the "10A" jack and turn the knob to the DC "10A" position; if you measure a current less than 200mA, insert the red test lead into the "200mA" jack and turn the knob to a suitable range within DC 200mA. After adjustment, you can start measuring. Insert the multimeter into the circuit and keep it stable to get a reading. If it displays "1.", then the range needs to be increased; if "-" appears on the left side of the value, it means that the current flows from the black test lead into the multimeter.
