Press this button to place a comment label in the display. Right click on the comment label to edit the displayed text or the comment label itself.

Press the Window button to select a windows function for the FFT, e.g. Blackman-Harris, Hanning, Hamming or simply rectangle.

This causes the continuous measurements to halt. When the same button is pressed again, the measurement is started again.

Make a hard copy of the current signal using the Windows default printer.

Measure the Total Harmonic Distortion. The results can also be printed.

Double click here to switch channel 2 on. The spectrum analyzer will now show both channels simultaneously, while the amplitude axes can be set up independently.

Press the right mouse button to setup the frequency axis.

Dragging this slider adjusts the horizontal position of the signal. Pressing the right mouse button allows setup of the frequency axis.

Drag this end of the slider (or the other end) to adjust the horizontal magnification. Press the right mouse button to setup the frequency axis.

Drag this label of the axis and adjust the vertical magnification. Press the right mouse button to setup channel 1.

Drag the axis and adjust the vertical position of channel 1. Pressing the right mouse button also allows to setup channel 1.

This led indicates whether the input signal is clipped (creates higher harmonics) or not.