Rather than try to measure antenna output and calculate received field strength, we measure the level at the DUT with an isotropic probe. The typical coverage for an E-field radiator is 10 kHz to 30 MHz, but the AT3100 Generator from Amplifier Research uses two sets of radiating elements to extend the spectrum coverage to 100 MHz. If your product is relatively small, investing in a test cell and the related instruments could provide you with precompliance testing capability at your company, saving you trips to a test laboratory. Isolation chambers come in various sizes, some even small enough to fit on a laboratory bench. These chambers give you an excellent indication of the capability of a product to pass the official certification tests.
Several companies offer test cells that help make precompliance testing flow smoothly.
Going a step further, the company provides turnkey immunity and emissions test capabilies in its ARcell Systems. The equipment includes a TEM cell, a signal generator, an RF power amplifier, and a directional coupler. Additionally, cables and a preamplifier, a power meter, and a field probe with a fiber-optic interface are provided. Each system comes with a computer, a printer, and operating software. It gives operators independence from the weather and isolation from ambient interferences, and a user can test both emissions and immunity of small products up to 5 GHz.