Reverberation chambers

A reverberation chamber is a specialized EMC test chamber generating very high field strength using modest amplifier power. The reflections between the RF shielded walls are optimized to add up to maximum of as many standing waves as practically possible. The chamber is mainly used for testing electrical immunity. The RF shielding is established by constructing the reverberation chamber from a 2 mm pan-type ZMA-140 galvanized or 3mm aluminum panel system. RF shielded doors and cabling access to the reverberation chamber are specially shielded for RF signals. This ensures that unwanted electrical noise from the outside world does not affect the test results and electrical immunity testing can be made without disturbing the surroundings. 

EMC testing in a reverberation chamber
When performing electrical or electromagnetic testing (EMC testing) the reverberation chamber is mode-stirred or mode-tuned by means of a stirrer. A stirrer system is a (large) structure of aluminum plates that is stepwise turned during testing. The objective is to maximize the standing wave pattern in the usable test volume. These EMC tests are statistically evaluated and the “worst case” data are used for the final evaluation of the test result. Electrical emission tests or specialized EMC testing in accordance to military, aerospace or automotive EMC test standards can be made in the reverberation chamber.

Multi functional EMC test facility
The reverberation chamber creates a multi functional EMC test facility for commercial, military and automotive testing. Comtest reverberation chambers comply with the following standards: IEC 61000-4-21prt 4-21, EUROCAE/ED-14F, MIL-STD 461F, RTCA/DO-160 as well as various automotive standards. The reverberation chamber can also be used for immunity and shielding effectiveness tests as well as for measuring total radiated power. Another application for the reverberation chamber is simulating complex multipath environments like computer rooms and other electrically congested areas.

Advantage of a reverberation chamber
The main advantage of testing in a reverberating chamber over the traditional semi anechoic chamber tests is that less power input is required to achieve the same field levels which make expensive amplifiers obsolete.

Reverberation chamber solutions
Comtest Engineering can supply the following reverberation chamber solutions:
- Reverberation chamber model 1716-0080 (LUF 80MHz)
- Reverberation chamber model 1716-0200 (LUF 200MHz)
- Reverberation chamber model 1716-0400 (LUF 400MHz)
- Reverberation chamber model 1716-1000 (LUF 1GHz)