Electromagnetic compatibility (EMC) standard BS EN IEC 61000-4-6 updated to 2023 version

Compared with BS EN 61000-4-6:2014 version, the differences are as follows:

1. Modified the principle of injection method selection; deleted the requirement to check the impedance of the AE end before using the clamp injection method

- For shielded wires, when EM clamp test is not suitable, direct injection or current clamp injection can be selected, and the current clamp injection option is added compared to the old version;

- For shielded wires, when EM clamp test is suitable, the new version can use EM clamp test, while the old version needs to detect whether the AE end meets the 150Ω system impedance, and then decide to use the EM clamp or current clamp injection test method;

- For unshielded wires, the new version chooses to use EM clamp or current clamp injection; the old version needs to detect whether the AE end meets the 150Ω system impedance, and then decide to use the specific test method of EM clamp or current clamp.

2. Updated the amplifier saturation check method. In the conducted immunity test, the amplifier needs to be tested in an unsaturated state. The 2023 version of the standard has made some updates to the method for confirming saturation, as follows:

1. Determine the maximum forward power P formax required during the level setting process of each frequency step in all coupling devices used.

2. Repeat the following steps for each frequency:

a. Set the power amplifier output level to P formax;

b. Increase the control level of the RF signal generator by 5.1 dB;

c. Record the new forward power P formax, inc;

d. If the difference between P formax, inc -P formax is between 3.1 dB and 7.1 dB for all frequency steps, the amplifier is within tolerance and the test system is sufficient for testing at the selected test level. If the difference is less than 3.1 dB or greater than 7.1 dB, the amplifier is nonlinear and not suitable for testing.

3. Annex H is changed to: Multi-signal test
The addition of multi-signal test applications is to shorten the test time for products that require multiple signal tests. However, if multiple signals are used for testing and the test result is still FAIL, the result of the single signal test will prevail.