EXFO MaxTester 635 - Manual (Page 198)

Frequency Tests
190 MAX-635
WB Attenuation

Select Graph button changes to Graph Selected when pressed and
opens a new selection of function keys which allow you to maneuver
the graph as follows:

Cursor - press the left/right arrow keys to decrease/increase the
values by moving the cursor. Press and hold the left/right arrow
keys to accelerate the cursor. Press
to recall the cursor and
place it in the middle of the current x-axis limits.

Zoom references the middle of the x/y axis and not the cursor
position. Press the arrow keys as follows:
Right = x-axis zoom in.
Left = x-axis zoom out.
Up = y-axis zoom in.
Down = y-axis zoom out.

Pan - use left/right arrow keys to pan the x-axis and the up/down
arrow keys to pan the y-axis.

1:1 resets the x-axis and y-axis limits to full scale.

Return To Results removes these function keys and displays the
Attenuation results page.