The multimeter detects short circuits in wires and provides results in seconds without any effort.
There are a bunch of newly purchased wires, and it is necessary to check whether there are short circuit problems in the wires, which will affect subsequent use. At this time, a multimeter comes in handy. Use a multimeter to detect short circuits in the wires. It is effortless and the results are available in seconds.
1. Detection method
Separate the wire cores at the two ends of the wire. Be careful not to cross or touch each other. Then move the multimeter to the upper position (Figure 1). Place the test leads on the wires of two different colors. Start checking whether the wires are connected. Short circuit measurement operation.
2. Test results
The measurement result is 0, which means there is a short circuit between the two wires. If the measurement result shows infinity, it means there is no problem with the line.
3. Things to note
When measuring a short circuit on a circuit, first turn off the main gate of the power supply, then adjust the multimeter switch to the 1 or 10 ohm range, and measure the two wire ends of the same group of circuits. If the resistance is almost 0, it means a short circuit.
Basic measurement methods:
Use the ohm x1 scale of the multimeter to measure both ends of the line. If the resistance value is close to zero, it means a short circuit. When there is a certain resistance value (depending on the load in the line), it cannot be judged whether it is a short circuit. When the voltage is constant, the resistance value The smaller it is, the greater the current flowing through the line.
Use the 1k or 10k ohm range of a multimeter to measure both ends of the line. If the resistance is infinite, it means an open circuit.
Multimeter measures DC voltage and AC voltage
(1) Measurement of DC voltage
Such as batteries, batteries, etc. Insert the black test lead into the "com" hole and the red test lead into the "V Ω" hole. Select the knob to a range larger than the estimated value (note: the values on the dial are the maximum range, "V-" represents the DC voltage range, "V~" represents the AC voltage range, and "A" represents the current range), and then Connect the test leads to both ends of the power supply or battery; keep the contact stable.
The value is read directly from the display. If it is displayed as "1.", it means that the range is too small, so you need to increase the range before measuring. If "-" appears on the left side of the value, it means that the polarity of the test lead is opposite to the actual power supply polarity. At this time, the red test lead is connected to the negative pole.
(2) Measurement of AC voltage
The measurement of the test lead jack is the same as that of DC voltage, but the knob must be turned to the required range of the AC gear "V~".
There is no positive or negative distinction between AC voltage, and the measurement method is the same as before. Regardless of whether you are measuring AC or DC voltage, you must pay attention to personal safety and do not touch the metal parts of the test leads with your hands.
