25422-5

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25422-5 is a standard (IEC25422-5), which classifies the safety of electronic equipment. Its application field is very extensive and its working principle is quite simple.

The broad applications of 25422-5 include house appliances, industrial control systems, audio-visual equipment, telecommunication systems, medical equipment and so on. It is used to screen and check the safety of those electronic systems, make sure it meets the regulations.

The core working principle of 25422-5 is a system of testing and measurement. It uses the most recent safety-related technology DSS (Device Self-Safety) to monitor different signals (such as current, voltage, temperature, etc.) and identify the possible risks. The testing covered by IEC25422-5 includes insulation monitoring and monitoring of over Current, excessive voltage, earth over Voltage, Ground Fault, arcs, flashes and shock hazards.

The insulation test and over Current measurements are carried out through the application of a series of DC and AC voltage tests on the power supply and components. The over Voltage and earth over Voltage tests are performed with a two-channel Low Resistance Tester, and the Ground Fault tests are made using a two channel High Resistance Tester.

The monitoring of arcs, flashes and shocking hazard is done using a capacitance measurement method, a slight variation of capacitance measurement. With this technique, the current flowing through a thin wire is used to measure the voltage generated by any arcs or flashes. The measurements are carried out in both the time and frequency domains, and any arcs or flashes are found by analysing the frequency components. Shock hazard is identified by observing the changes in voltage and current over time.

These tests and measurements confirm the safety of the equipment and prevent any possible risk. 25422-5 helps companies guarantee that their electronic systems meet the safety regulations set by the International Electrotechnical Commission, and so they can proceed with their business with confidence.

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