Audio Waveform PM Menu Key Sequence: Measure or (Shift + 4) > Audio Waveform > Audio Waveform Audio Waveform PM 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. Scale milli-Rad Press to set the sweep scale in milliradians. Use the numeric keypad, the rotary knob, or the arrow keys to enter a value. Back Press to return to the Measurements menu.