1、 Resistance test method
Resistance test method is a common measurement method.
It usually refers to a method of measuring whether the motor, line and contact meet the nominal value and whether they are on and off by using the resistance gear of multimeter, or measuring the insulation resistance between phase and phase, phase and ground by megger. When measuring, pay attention to the selection of the range used and the accuracy of the calibration table. Generally, when using the resistance method for measurement, the general practice is to select the low-grade first. At the same time, pay attention to whether the measured line has a circuit, and live measurement is strictly prohibited.
2、 Voltage test method
Guizhou high and low voltage distribution equipment tells you that the voltage test method refers to a method of measuring the voltage value in the circuit by using the corresponding voltage gear of the multimeter.
In general, sometimes the voltage of power supply and load is measured, and sometimes the open circuit voltage is measured to judge whether the line is normal. When measuring, pay attention to the gear of the meter and select the appropriate range. Generally, when measuring unknown AC or open circuit voltage, the highest gear of voltage is usually selected to ensure that it will not operate under high voltage and low range, so as to avoid damaging the meter; Pay attention to the positive and negative polarity when measuring DC at the same time.
3、 Current test method
Guizhou high and low voltage distribution equipment tells you that the current test method is usually a method to measure whether the current in the line meets the normal value to judge the cause of the fault. For weak current circuit, ammeter or multimeter current gear is often connected in series in the circuit for measurement; Clamp on ammeter is often used to detect strong current circuit.
4、 Instrument test method
With the help of various instruments and meters to measure various parameters, such as observing the change of waveform and parameters with oscilloscope, so as to analyze the cause of fault, which is mostly used in weak current lines.
5、 Routine examination method
Rely on people's sensory organs (such as burning smell, ignition and discharge of some electrical equipment in use) and with the help of ~ some simple instruments (such as multimeter) to find the cause of the fault. This method is the most commonly used and first used in maintenance.
6、 Replacement of original parts
Guizhou high and low voltage power distribution equipment tells you that when you suspect that a device or circuit board is faulty, but you are not sure, and there are substitute parts, you can replace the test to see whether the fault disappears and returns to normal.
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