1. The process of adjusting the dimensions a resonator so that the primary resonance falls within a specified frequency band.
    Example: for a specified frequency band between 19950 Hz and 20050 Hz (i.e., nominally 20 kHz), an axial resonator is correctly tuned when its axial resonance falls within this frequency band.
  2. An electrical adjustment of the power supply that adjusts the operating characteristics of the power supply to those of the stack.