The purpose of our measurement is to characterise the properties (uniform field area, UFA) of the anechoic room according to IEC 61000-4-3 Ed. 3.1 b or EN 61000 4 3.
16 points in a vertical plane of 1.5 m x 1.5 m, 26 MHz to 40 GHz, 1 % frequency step size, horizontal and vertical polarisation of the transmit antenna. Up to 18 GHz the transmit antenna is fixed at one position to test the uniformity of the 16 points.
For Windowing the transmit antenna is set up at 9 different points to test the uniformity. This windowing may be used in the frequencies above 1 GHz and it must be used for frequencies higher than 18 GHz.
The calibration of the radiated susceptibility test setup for irradiating the EUT with the customer’s equipment according to IEC 61000-4-3 Ed. 3.1 b or EN 61000 4 3 is not included. The recording of the field strength, 40 cm above the earth reference plane, is only done at additional costs upon request.
During the susceptibility testing, other calibrated measurement equipment is used than for our site validation. As a result, different UFA homogeneity results may occur and therefore the customer needs to adapt the requirements and procedures for regular radiated susceptibility tests.