Audio Waveform AM Menu Key Sequence: Measure or (Shift + 4) > Audio Waveform > Audio Waveform Audio Waveform AM Menu Sweep Time Press to set the sweep time. If you use the numeric keypad to enter a value, then the submenu keys change to Time in units of s, ms, µs, ns, or ps. Squelch Power Press to set the squelch power level. Back Press to return to the Measurements menu.