How to test leads on multimeter | multimeter test leads

Voltage measurement

1. Measure DC voltage, such as battery, Walkman power supply, etc. First insert the black test lead into the “com” hole, and insert the red test lead into the “VΩ”. Select the knob to a range greater than the estimated value (note: the value on the dial is the maximum range, “V-” represents the DC voltage range, “V~” represents the AC voltage range, and `”A” is the current range ), then connect the test leads to both ends of the power supply or battery; keep the contact stable. The value can be read directly from the display. If it displays “1”, it means the range is too small, and the range must be increased before measurement. If “-” appears on the left side of the value, it means that the polarity of the test lead is opposite to the polarity of the actual power supply. At this time, the red test lead is connected to the negative pole.

2. Measure AC voltage. The test lead jack is the same as the DC voltage measurement value, but the knob should be set to the required range for the AC range “V~”. There is no positive or negative AC voltage, and the measurement method is the same as before. Regardless of measuring AC or DC voltage, please pay attention to personal safety and do not touch the metal part of the test pen with your hands.

Current measurement

1. Measure DC current. First insert the black test lead into the “COM” hole. If the measured current is greater than 200mA, insert the red test lead into the “10A” jack and turn the knob to the DC “10A” range; if the measured current is less than 200mA, insert the red test lead into the “200mA” jack , And then turn the knob to an appropriate range within 200mA DC. After adjustment, measurement can be performed. Insert the multimeter into the circuit, make it stable, and then you can read it. If “1” is displayed, the range must be increased. If “-” appears on the left side of the value, it means that the current flows from the black test pen into the multimeter.
Measurement of alternating current. The measurement method is the same as 1, but the gear should be set to AC gear. After the current measurement, the red pen should be reinserted into the “VΩ” hole.

Resistance measurement

Insert the test wire into the “COM” and “VΩ” holes, turn the knob to the desired “Ω” range, and then connect the test wire to the metal part at both ends of the resistor. During the measurement, you can touch the resistor with your hand, but do not hold your hand at the same time. Touch the two ends of the resistor, which will affect the accuracy of the measurement-the human body is a conductor with a large resistance but a limited size. When reading, keep the test wire in good contact with the resistance; pay attention to the unit: the unit within the range of “200” is “Ω”, the unit within the range of “2K” to “200K” is “KΩ”, and the unit is “2M” and above. MΩ”.