Voltage and current stage measurement with digital multimeter
1, DC voltage measurement, such as batteries, Walkman power supply. First of all, the black pen into the "com" hole, the red pen into the "V Ω". Select the knob to a range larger than the estimated value (Note: the values on the dial are the maximum range, "V-" that the DC voltage gear, "V ~" that the AC voltage gear, "A " is the current gear), then connect the meter pen 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 shown as "1.", it indicates that the range is too small, then it is necessary to increase the range and then measure the industrial appliance. If the value of the left side of the "-", it indicates that the polarity of the pen and the actual power supply polarity is reversed, when the red pen is connected to the negative pole.
2, AC voltage measurement. Pen jack and DC voltage measurement, but should be played to the knob AC file "V ~" at the required range can be. AC voltage without positive and negative points, the same measurement method with the previous. Whether measuring AC or DC voltage, pay attention to personal safety, do not touch the metal part of the pen with your hand.
The method of measuring current file of digital multimeter
1, DC current measurement. Insert the black pen into the "COM" hole. If the measurement of current greater than 200mA, the red pen should be inserted into the "10A" jack and the knob to DC "10A" gear; if the measurement of current less than 200mA, the red pen should be inserted into the "200mA" jack and the knob to DC "10A" gear; if the measurement of current less than 200mA, the red pen should be inserted into the "10A" jack. 200mA" jack, the knob to DC 200mA within the appropriate range. After adjusting, you can measure. String the multimeter into the circuit, keep stable, you can read. If the display is "1.", then we need to increase the range; if the value of the left side of the "-", it shows that the current from the black pen into the multimeter.
