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Power Emission

1. Introduction to the test

　　The absorbing clamp measurement method (ACMM) is an alternative to the radiated emission measurement method for small test items connected to only one mains lead (or other type of lead), such as household appliances and power tools. ACMM uses absorbing clamps to determine the disturbance power. The advantage of ACMM for radiated emission measurement is that it shortens the test time and saves the cost of the site (it can be carried out in a shielded room).

　　The principle of ACMM is that for a small EUT, the radiation emission caused by the common mode current on the lead is far greater than the outward radiation from the surface of the object under test. The power line of the EUT can be regarded as a radiating antenna. At this time, the disturbance power is approximately equal to the position where the absorbing clamp is at the maximum value of the common mode current, which is the measured power provided by the EUT to the line under test (LUT). In order to find the "maximum value of the common mode current", the absorbing clamp needs to be able to move, so there needs to be a absorbing clamp slide rail with a length of 6 meters in the test system.

　　ACMM method, the standard frequency range is 30MHz~300MHz.

2. System connection diagram

3. Typical configuration

Disturbance power test system
serial number	product	illustrate	brand
1	ESR3	EMI fully compatible test receiver, frequency range 9 kHz~3.6GHz	Rohde&Schwarz/Germany
2	EMC32	testing software	Rohde&Schwarz/Germany
3	MDS 21	Absorbing clamp, frequency range 30~1000MHz, 50ohm	Rohde&Schwarz/Germany
4	CGR5.4	Power disturbance test environment, including 6-meter automatic guide rail, 6dB attenuator and 9-meter RF cable	MATURO/ Germany
5	SCU	rail controller	MATURO/ Germany
6	CE-TAB	CE test environment, including solid wood test table, insulation support, etc.	Century Huize/China
7	SR	Shielded room, size can be customized according to customer site	Frankonia/Germany

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