How to use a digital multimeter

a, before use, should carefully read the relevant instructions, familiar with the power switch, range switch, jack, special jack function.

b. Put the power switch in the ON position.

c, AC and DC voltage measurement: according to the need to dial the range switch to DCV(DC) or ACV(AC) appropriate range, the red pen into the V/Ω hole, the black pen into the COM hole, and the pen and the measured line in parallel, the reading is displayed.

d, AC-DC current measurement: the range switch to DCA(DC) or ACA(AC) appropriate range, red pen into mA hole (<200ma) or 10a hole (>200mA), black pen into COM hole, and the universal meter in series in the measured circuit can be. When measuring direct flow, digital multimeter can automatically display polarity. <200ma) or 10a hole (><200ma) or 10a hole (><200ma) or 10a hole (>

e, resistance measurement: switch the range to the appropriate range of Ω, red pen into the V/Ω hole, black pen into the COM hole. If the measured resistance exceeds the selected range, the multimeter will display "1". In this case, a higher range should be selected. When measuring resistance, the red watch pen is positive and the black watch pen is negative, which is the opposite of the pointer type multimeter. Therefore, when measuring transistors, electrolytic capacitors and other polar components, we must pay attention to the polarity of the marker.