HP 54620A User's And Service Manual page 41

Getting Started
Learn the front panel
Channel Numbers and Labels
The channel numbers are always shown along the left edge of the display.
You can assign channel labels to help you remember the function of each
channel in your circuit, or disable the labels to increase the waveform display
area. See chapter 2, "Making Analyzer Measurements," for more information
on using labels.
When using the HP 54620C color logic analyzer, you can assign colors to
channels using the Label menu. See "Using Color" in this chapter for more
information about assigning colors to channels.
Waveform Display
The waveform display area shows all acquisition results. You can change the
graticule or turn it off entirely using the Display menu. See chapter 2,
"Making Analyzer Measurements."
When using the HP 54620C color logic analyzer, the waveform display shows
all activity and selections pertaining to a particular channel in the color
assigned to that channel. See "Using Color" in this chapter for more
information about assigning colors to channels.
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