WTD 81 Greding

Anechoic Chamber for 10m testing on MIL STD & Industrial Electronics (ISM) applications

The largest chamber in Europe for testing military components and vehicles is located in South Germany; it was originally commissioned into operation in 1988 and in 2008, was refurbished and upgraded to become an industrial equipment test site. The 10m Semi-Anechoic Chamber, for MIL STD and CISPR testing, is used for full-compliance radiated emission measurements in 3m and 10m test distances and for radiated immunity testing in 1m and 3m test distance. All walls and ceiling are completely lined with absorbing material.
The chamber covers the whole frequency range from 10kHz to 40GHz and is compliant to the latest edition of MIL STD 461 and MIL STD 462. Typical EUTs (Equipments Under Test) are military and civil vehicles and components and large industrial equipment of any kind.


The chamber’s modularity for RF shielding and RF absorber lining is a proven advantage should the chamber ever be relocated or expanded.


Technical Data

Dimensions: 45.1m x 20.0m x 18.4m (L x W x H)


Radiated Measurements

  • 30MHz to 1GHz: Full compliance with ANSI C63.4 and CISPR 16-1-4 in 10m measuring distance
  • 1GHz to 18GHz: Full compliance with CISPR 16-1-4 in 3m and 10m measuring distance
  • Quiet Zone: Ø9m, cylinder height 2m


Military Test and Measurement Standards

  • MIL STD 461F
  • MIL STD 462



The EUT entrance is by means of a 10 x 10 (m) sliding gate with access rampe for track vehicles; RF absorber lining by means of 80 and 100 inches hollow pyramidal absorbers. The chamber features a positioning system that includes a 9m diameter turntable, this being modified from its original use in a full anechoic chamber to the facilities present semi-anechoic chamber design; there are also antenna masts with controller.

Other features such as a RF shielded CCTV camera system, audio intercom, smoke detection, fiber optic converters, RFI power line and signal line filters were retained from the earlier chamber configuration.

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