the same
The principle is simple. Measure with resistance.
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It is better to use the kind of digital multimeter with sound, hit the diode file, it is best to unplug all the appliances in the home, put the switch down, and then randomly find a plug to insert the watch pen. If there is a short circuit, the multimeter releases a beep, beep, beep sound. If there is no short circuit in the line itself, then connect the appliance one by one to find the short circuit location.
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Second, the line leakage
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It is difficult to measure, but it can measure the resistance of the line to the ground. If the electrical leakage is generally neutral or live wire, it will be communicated or poorly insulated with the housing (already grounded housing), which can be measured by the resistance file.
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Multimeter, also known as multimeter, multimeter, three-purpose meter, complex meter, etc., is the most basic tool in the field of electronic testing, and is also a widely used test instrument. It consists of three main parts, such as the meter head, the measuring circuit and the transfer switch. Generally to measure voltage, current and resistance as the main purpose.
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According to the display mode, it is divided into pointer multimeter and digital multimeter. It is a multi-function, multi-range measuring instrument, general multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio electrical equality, and some can also measure AC current, capacitance, inductance and some parameters of semiconductors. The basic principle is to use a sensitive magnetoelectric DC ammeter (microammeter) as the watch head. When a small current passes through the meter head, the multimeter will have a current indication
Multimeter is a national standard, under normal circumstances, the refrigerator multimeter and ordinary multimeter is not much different, if the refrigerator multimeter function is simpler on special equipment, not as complete as the ordinary multimeter function.
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answer
Refrigerator multimeter and ordinary multimeter are the same, when using the multimeter to measure the relay coil in the case of power failure, there is no short circuit or open circuit, the normal resistance value is generally several hundred euros to several thousand euros. You can also measure the contact on and off to judge, but pay attention to safety.
To remove the back cover of the refrigerator, locate the compressor, remove the black electrical box cover, and then locate the part where the power cord connects to the compressor. There will be three wires, red, blue, yellow and green. Be sure to remember that the red line is the live line, the blue line is the neutral line, and the yellow and green lines are grounded. Finally, set the multimeter to the ammeter and measure the current of the red and blue lines with the probe.