| Definition: | ratio between the time period (t1), in which the output voltage is above a specified level, and the time period (t2), in which the output voltage is below the specified level X Figure 17 – Characteristics of an output waveform Note 1 to entry: The symmetry is expressed in percent of the duration of the full signal period. Note 2 to entry: The specified level may be the arithmetic mean between levels VOL and VOH, or 50 % of the peak-to-peak amplitude. The ratio is expressed as: 
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