5 ways to use a digital multimeter
a. Before use, read the relevant instruction manual carefully, and be familiar with the functions of power switch, range switch, socket and special socket.
b. Put the power switch in the ON position.
c. Measurement of AC and DC voltage: Turn the range switch to the appropriate range of DCV (DC) or ACV (AC) as required, 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 the circuit under test in parallel , the reading is displayed.
d. Measurement of AC and DC current: Turn the range switch to the appropriate range of DCA (DC) or ACA (AC), insert the red test lead into the mA hole (<200mA) or 10A hole (>200mA), and insert the black test lead into the COM hole , and connect the multimeter in series to the circuit under test. When measuring DC flow, the digital multimeter can automatically display the polarity.
e. Measurement of resistance: Turn the range switch to the appropriate range of Ω, insert the red test lead into the V/Ω hole, and insert the black test lead into the COM hole. If the measured resistance value exceeds the maximum value of the selected range, the multimeter will display "1", and a higher range should be selected at this time. When measuring resistance, the red test lead is positive and the black test lead is negative, which is just the opposite of the pointer multimeter. Therefore, when measuring polar components such as transistors and electrolytic capacitors, you must pay attention to the polarity of the test leads.
