The use of digital multimeter_Tutorial on the use of digital multimeter
Digital multimeter mainly has: DC voltage, DC current, AC voltage, AC current, resistance, circuit on-off test, diode test and other commonly used measurement functions; with the development of electronic technology, the multimeter has a lot of applications: data storage, data transmission, oscilloscope, etc.: and some of them to the development of professional applications: power test power meter, leakage current tester, insulation resistance tester The infrared thermometer used in industrial and mining industries, noise meter and anemometer used in environmental testing. The following is an example of Unidux handheld general type digital multimeter UT136B, the use of multimeter knowledge. UT136B is a 3l/2 digital multimeter, but in addition to the voltage, current, resistance test function, there are capacitance, frequency, diode, on and off the beeping, automatic ranging, the stalls are clear and unambiguous.
AC and DC voltage measurement:
The power switch is placed in the ON position, according to the need to range switch to DCV (DC) or ACV (AC), the red pen inserted into the V / Ω holes, the black pen inserted into the COM holes, and then the two pens are connected to the point being measured, the liquid crystal display will be directly displayed on the voltage of the point being measured. When measuring the wavenumber voltage of the instrument, the black pen should be used to contact the low potential end of the measured voltage (e.g., the common ground terminal of the signal generator or the chassis), so as to reduce the measurement error. Automatic range multimeter does not need to consider the manual conversion range, measuring 380V and 220V a gear solution, simple and clear, at a glance, to prevent misuse.
Resistance measurement:
The red pen is inserted into the V/Ω hole, the black pen is inserted into the COM hole, and then the two pens are connected to the back side of the resistor terminals, the LCD display will directly display the resistance value of the measured resistor!
On-off test:
Red pen inserted into the V / Ω hole, black pen inserted into the COM hole, the pen is connected to the line under test at both ends, if it is through the buzzer will sound.
Capacitance test:
1, the capacitor will be discharged (especially large-capacity electrolytic capacitors must be discharged first), otherwise it will burn the multimeter, the red pen inserted into the V / Ω holes, the black pen inserted into the COM holes, connected to the capacitance measurement.
