circuit noise level การใช้

• The circuit noise level is usually expressed in dBrn0, signifying the reading of a circuit noise meter, or in dBa0, signifying circuit noise meter reading adjusted to represent an interfering effect under specified conditions.
• Although today, the valve audio amplifiers attract the most attention from enthusiasts, the quality of Radford's designs continued into the transistor age with the " Zero distortion " series of solid state power amplifiers produced in the mid 1970s, in which THD was reduced to less than the circuit noise level.