Superior RFI Test Methods
The Radio Frequency Interference (RFI) test method used by
ADEMCO's Quality Assurance department is superior to the methods used by most
A Transverse ElectroMagnetic (TEM) cell used by most other
manufacturers is a small chamber in which products are placed and then
irradiated with RF energy at an established level to try to induce a false
alarm. Unfortunately, TEM cells are susceptible to standing waves and other
phenomena which have a tendency to overstate the level of immunity.
ADEMCO uses a full-size, shielded RF chamber that more
realistically emulates real world conditions. To maintain high accuracy, the
chamber is calibrated to the desired RF energy level at every test frequency
prior to running each test. Comparison tests between and ADEMCO's full-size
chamber and a TEM cell have shown that an immunity of 10V/m in ADEMCO's chamber
corresponds to an immunity of 20-30V/m in a TEM cell.