RF Reverbration Chamber
An RF Reverberation Chamber, sometimes referred to as a mode tune / mode stirring chamber, is a shielded enclosure or resonance cavity for RF testing. This cell is a statistical isotropic, random polarity, with RF uniformity within specified limits. Typically, RF reverberation chambers consist of paddles (or tuners) that stabilize the field, randomizing the boundary conditions. There are two types of Reverberation test methods. “Mode tuned” refers to when the paddle is moved to a position and then RF is applied for sufficient time to exercise the equipment. In Ecotone, the tuner can be run by a computer-controlled stepper motor that also runs RF generation and monitoring equipment. The second type is “mode stirring”, when paddles are applied for complete paddle revolutions with constant RF energy. The paddle speed is varied to meet the specific requirements of the device under test. In both methods, one full turn of the paddle applies RF energy to all sides of the device in one pass. This greatly simplifies the process compared to direct illumination testing.
What are the benefits of RF Reverberation Chamber Testing?
The benefits of recycled testing are many. RF is applied to all exposed sides of the device under test during one complete 360 ° turn of the pad, rather than one side. For direct illumination testing, several standards require that all DUT apparatuses be illuminated. This can be difficult – impossible even on complex objects. The required window impact test is not necessary to apply direct illumination during RF Reverberation Chamber Testing because the intensity of the field is constantly changing. Test iteration is much easier to obtain in a reverb chamber with proper procedures, and running the test is much less complex than a single aspect angle test. The distance of the antenna, the target (focus), the width of the 3dB beam, the location of the field probe, the EUT layout, and the EUT location in the amount of work are all less than a factor in the iteration of the test.
When is the RF Reverberation Chamber Used?
RF Reverberation Chamber are useful for radiation sensitivity, radiation emission (total radiation power), shielding effectiveness, and many other troubleshooting scenarios for equipment used in the aerospace, defense, and automotive sectors. The reverb test method in SAE ARP 5583 is called the preferred method, stating that reverb method testing is the recommended and preferred method to show compliance for large and / or complex level A (flight critical) systems.
FAO, AEROCAE, RTCA, and major airframe manufacturers (i.e., Boeing, Airbus, etc.) are “preferred” on the anechoic chamber, due to time and cost savings, as well as the robustness of the Reverb test method. Technique of direct illumination.
You should know if recombination testing is right for your program. RF Reverberation Chamber are random in polarity, which makes it challenging to determine the directivity of RF energy. Testing multiple field levels on a system, such as outside the pressure vessel level and inside the pressure vessel level, can be difficult; All the instruments in the chamber are in contact with the same area. Pulse widths have limitations due to the large amount of stored energy in the high Q (efficient) chamber. If you have small, simple instruments, single aspect angle tests may be fast and sufficient for test coverage. There are ways to compensate for each, and an Ecotone engineer can help with suggestions or assist you with a test plan.
Both direct illumination and regeneration test methods are acceptable routes for authentication. They both have advantages and drawbacks that each champion has as a test method. Fortunately, Ecotone has the ability to test in both methods and engineering expertise to support its path to certification.
Quality:-
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