In the EMC test, what are the influencing factors of the failure of the test during the lightning su

Add some lightning and surge protection devices at the power supply and signal line interfaces.

Varistors. TVS transistor (Zener diode).

Gas discharge tubes.

Solid discharge tubes.

The specific products of these devices have their own parameters, if you set the voltage very high when you do the test, and the selected device can't prevent such a high voltage is useless. So see if the parameters of the device you choose are right, and whether it can withstand such high voltages and currents.

2 ohm impedance bai indicates low pressure.

Source resistance of the power grid.

DU anti-body. a signal generator with an equivalent output impedance of 2 ohms;

The 12 ohm back impedance indicates the source impedance of the low-voltage grid to the ground. A signal generator with an additional resistance of 10 ohms in series is used.

0. The electrical environment with good protection is often in a special room 1. The electrical environment with partial protection.

2. The electrical environment with good isolation of class cables and even short traces is well isolated 3. The electrical environment of parallel laying of class cables.

4. Class interconnection lines are laid along the power supply cables according to outdoor cables, and these cables are used as electrical environments for electronic and electrical circuits.

5. Class electrical environment in which electronic equipment is connected with communication cables and overhead power lines in non-populated areas Class 1 4: (8 20us).

Category 5: Power line port and short distance signal circuit line port to long distance signal circuit line port: 10 700us

Of course, it is impossible to exactly correspond to the surges, voltages and currents generated by nature. If you wear an inductor or capacitor on the load, it will change the current waveform that the EUT is weighted on.

Combined waves simulate the actual situation in nature.

There are also devices that measure both open-circuit voltage waveforms and short-circuit current waveforms separately. Or is it because there are various waveforms of induced surges in nature?

Internal resistance refers to the resistance inside the surge generator, which plays the role of current limiting.

The test waveform in IEC 61000-4-5 is the same, and the signal port is 42 ohm internal resistance. The only reason why the internal resistance is different is because the actual induced current will be different. For example, the signal line and network cable can only be 100 meters, but the 220V power line may be kilometers.

Therefore, when the induction surge occurs, the inrush current at the power port will be greater than that at the signal port. In order to simulate this situation, the laboratory naturally has to reduce the internal resistance of the power port.

1.In addition to the above two waveforms of du, there is also a 10 700 waveform, the waveform is for the test of the special power supply part, and the 10 700 and 8 20 are for the test waveform of the signal line, which is explained in detail in the specific waveform standard; There will definitely be voltage and current at the same time during the test; The current and power supply are also affected by the impedance of the EUT, but after all the test terminal voltages are specified, different samples are tested in any place that meets the standard, although the impedance of the EUT has an effect on the current, but it is the same in each laboratory and the test can be repeated, so it does not matter, which is also the reason why the standard specifies the terminal voltage.

2.Regardless of whether it is common mode or differential mode, the terminal voltage of the combined wave is the same; The difference between 2 ohms and 12 ohms is that 2 ohms are used for general testing, and 12 ohms are rarely used.

Summary. Hello dear! What is the method to pass a lightning surge test?

In order to pass the lightning surge test, the following steps are generally required: 1. Determine the lightning surge test specification; 2. Carry out factory debugging and test the performance of the equipment according to the factory standard; 3. Conduct actual scenario tests; 4. Use the simulator to realize the scene test; 5. Conduct data analysis and analyze test results; 6. Take improvement measures to ensure the reliability of the equipment.

Hello dear! What is the method to pass a lightning surge test? In order for the lightning surge test to pass, it is generally necessary to follow the following steps:

1. Determine the lightning surge test specification; 2. Carry out factory debugging and test the performance of the equipment according to the factory standard; 3. Conduct actual scenario tests; 4. Use the simulator to realize the scene test; 5. Conduct data analysis and analyze test results; 6. Take improvement measures to ensure the reliability of the equipment.

In order to pass the lightning surge test, the following steps are generally required: 1. Determine the lightning surge test specification; 2. Carry out factory debugging and test the performance of the equipment according to the factory standard; 3. Conduct actual scenario tests; 4. Use the simulator to realize the scene test; 5. Conduct data analysis and analyze test results; 6. Take improvement measures to ensure the reliability of the equipment.

Now test the lightning surge, and the thyristor plastic body explodes.

2500v test lightning surge thyristor plastic body explosion 2500v is due to the following reasons:1The voltage limit of the plastic used in the thyristor body is lower than that of a short circuit near the circuit or the component burns out, and an overvoltage situation occurs.

3.The withstand voltage and insulation failure of the circuit causes the insulation performance to be impaired, which causes the thyristor to blow up. To solve this problem, you can:

1.Check for short circuits, check the installation status of the thyristor and nearby circuits. 2.

The thyristor body was replaced with a higher grade of plastic material, so that it can safely withstand the withstand voltage of 2500V. 3.Check the insulation of the circuit to ensure that the insulation is reliable to avoid leakage or overvoltage.

Lightning surges are part of EMC testing. Lightning surge refers to the instantaneous high voltage generated by the lightning strike line on the power line, signal line, and control line, and is generally suppressed by TVS.