Beta is a measurement similar to Asymmetry that is easier to make. Also, since beta is directly related to the writing power in a CD-R writer, this measurement is used by CD writers to optimize their writing power. Connect the oscilloscope to the HF output on the rear panel. Unlike the other measurements, the scope must be set to AC coupling. Now when observing the HF eye pattern, it will center itself around 0 volts. If we call A1 the distance that the waveform reaches above 0 volts, and A2 the distance that the waveform extends below 0 volts, then

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