How to use the multimeter to measure the short circuit, open circuit and short circuit of the line?
Measurement of current1 、 measurement of DC current. The first black probe into "COM" hole. If the measured current is more than 200mA, will be the red pen into the "10A" Jack and the knob to direct "10A"; if the current measurement is less than 200mA, the red pen into the "200mA" Jack will knob to the appropriate range of DC within 200mA. When adjusted, it can be measured. String the multimeter into the circuit and keep it steady until you read it. If the display is "1.", then to increase the range; if the numerical left "-" appears, indicates that the current from flowing into the black pen multimeter.Measurement of alternating current. The measuring method is the same as that of 1, but the gear should be switched to the AC gear. After the current measurement is finished, the red pen should be inserted back into the "V" hole. If you forget this step and measure the voltage directly, ha ha! Your table or power in "a wisp of smoke in the sky" - scrap!
Measurement of alternating current voltage. The measurement probe Jack and the DC voltage, but should be the knob to exchange files can range "V ~" desired. The AC voltage has no positive or negative points, and the measurement method is the same as before. Whether measuring AC or DC voltage, should pay attention to personal safety, do not touch the metal part of the pen.
Now basically with digital multimeter, I'll tell about its use. If it is the circuit breaker (insert pen with 1 methods) (resistance measurement) both in the stalls (resistance gear) measurement should display is "1" has been open. The open circuit is also broken. The short circuit is also measured in the resistance shift. What should be shown is "0" indicating no resistance. If you measure the position of the 2 pole, you will call an alarm. More multimeter usage: 1, DC voltage measurement, such as batteries, batteries and so on. The black pen is inserted into the "com" hole, the red pen is inserted into the V. "". The knob to large range than the estimated value (Note: on the face of each value is the maximum range, "said DC voltage V", "V" said AC voltage grade, "A" is the current file), then the probe connected to power supply or battery ends; keep stable contact. The value can be read directly from the display screen. If it is shown as "1.", the measurement range is too small. Then, a large number of measurements should be added. If the left appears in the numerical "-" indicates that the pen polarity and the actual power of opposite polarity at the anode is connected the red pen.
