På-av-test av digitalt multimeter
⒈Insert the black test lead into the COM jack and the red test lead into the V/Ω jack (the polarity of the red test lead is " plus "), set the function switch to the "what" block, and connect the test lead to the diode to be tested, the reading is that the diode is positive Approximate value of the pressure drop.
⒉ Connect the test leads to both ends of the line to be tested. If the resistance between the two ends is lower than about 70Ω, the built-in buzzer will sound.
