HP 54645A User's And Service Manual page 40

Front-Panel Areas Description
Channel Numbers The channel numbers are always shown along the left edge of the
display.
Channel Labels 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.
Analog channel Voltages for channels 1 and 2 (analog channels 1 and 2 on
voltage levels HP 54645D) are set to 100 mV by default, and range from 1.0 mV to
5.0 V.
Front-Panel Overview
Description of Front-Panel Areas
Applies to Unit:
HP 54645A/D
HP 54645D only
HP 54645A/D
2-15