How to use a multimeter to measure leakage:
First, disconnect the power supply main switch, followed by the multimeter to RX10K gear; then a pen reception measurement of the firewire, the other pen ground, and so on the multimeter digital display stabilized, look at the value of the resistance; if the value of the resistance is less than 0.5 megohms, indicating that the main line leakage. The same way to measure the other wire and its look at the split circuit of the appliance.
What are the precautions for the use of multimeter:
1, charged measurements:
First of all, when measuring 250 volts of AC voltage with a multimeter, a meter can be connected to the shell of the appliance, and another meter grounded, if the indicator needle voltage is higher than 30-50 volts, will be adjusted to the 50-volt multimeter, the general power supply is lower than 30 volts belong to the normal, and vice versa, higher than 30 volts. for leakage.
2, input resistance and zero current:
Secondly, the multimeter measurement device will have some measurement error, then we have to see how much the device allows the measurement of the limit value. Therefore, it is best to choose a high input, low current measuring instrument, otherwise it will be affected by it.
3, serial mode rejection ratio and *** mode rejection ratio:
In the measurement of some of the measurement without distance, if the surrounding electric field, magnetic field and other interference signals, then it will also cause the multimeter readings are not allowed, so in order to avoid the occurrence of this problem, the multimeter measurement, according to the environment, such as the issue of the choice of digital multi-meter with a protective end of the G, can effectively inhibit the signal interference.
4, display form and power supply:
Finally, the digital multi-meter not only has the role of displaying numbers, but also display symbols, text and other functions, and according to its dimensions and so on is divided into four categories of small, large, medium and ultra-large, and so on, so in order to better observation of the operation, it is recommended that the choice of the actual needs.
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