Use of digital multimeter_Digital multimeter tutorial
The digital multimeter mainly includes: DC voltage, DC current, AC voltage, AC current, resistance, circuit continuity test, diode test and other common measurement functions; with the development of electronic technology, the multimeter has many application functions: data storage, data Transmission, oscilloscope, etc.: Some of them are developed into professional application fields: power meter, leakage current tester, insulation resistance tester for electric power test, infrared thermometer used in industrial and mining industries, noise meter and anemometer for environmental test wait. Let's take the UT136B hand-held ordinary digital multimeter of Unilever Company as an example to talk about the knowledge of using the multimeter. UT136B is a 3l/2-digit digital multimeter, but in addition to the voltage, current, and resistance test functions, it also has capacitance, frequency, diode, on-off buzzer, automatic range, and the gears are clear.
AC and DC voltage measurement:
Put the power switch in the ON position, turn the range switch to DCV (direct current) or ACV (alternating current) as required, insert the red test lead into the V/Ω hole, insert the black test lead into the COM hole, and then connect the two test leads to the measured point On the LCD, the voltage of the measured point will be directly displayed on the LCD. When measuring the flow voltage of the instrument, the black test lead should be used to touch the low potential end of the measured voltage (such as the common ground end or the case of the signal generator), so as to reduce the measurement error. The automatic range multimeter does not need to consider manual range conversion, and it can be solved by measuring 380V and 220V in one gear, which is simple and clear at a glance, and prevents misoperation.
Resistance measurement:
Insert the red test lead into the V/Ω hole, insert the black test lead into the COM hole, and then connect the two test leads to the two ends of the backside resistor, and the resistance value of the measured resistor will be directly displayed on the LCD screen.
Continuity test:
Insert the red test lead into the V/Ω hole, insert the black test lead into the COM hole, and connect the test lead to both ends of the tested line. If it is on-off, the buzzer will make a sound.
Capacitance test:
Discharge the capacitor (especially the large-capacity electrolytic capacitor must be discharged first), otherwise the multimeter will be burned out. Insert the red test lead into the V/Ω hole, and the black test lead into the COM hole, and connect to the capacitance measurement.
