Is it standard practice to use degrees to represent the phase in frequency response analysis?

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It usually is standard practice to use degrees to represent the phase or phase margin, although you can certainly use radians (use the formula Phase = 2*pi*(deltaT/T) or Phase = 360*(deltaT/T), as long as you are consistent. For example, in electronic amplifiers, phase margin is the difference, measured in degrees, between the phase angle of the amplifier's output signal and -360° (wikipedia). --Soto 18:36, 22 October 2007 (PDT)