The hum measurement mode provides a graph view of the measurement results. The amount of hum in 50 or 60 Hz steps (depending on region) is displayed on a bar graph. A marker provides step size and hum percentage for the current bar in the region below. Use the up and down arrows to move the marker. With each key press, the marker shall increment or decrement to the next or previous step in the hum measurement.

The measurement is continually updated for the current channel. Available channels are specified by the currently selected channel plan.
 

Use the left and right arrows to adjust the active channel.

Bar Graph Shading

When the marker is on a channel, the top of the marker is dark, and overstrike portion of the channel is of the color light gray.