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.