HP 54645A User's And Service Manual page 85

MegaZoom Concepts and Oscilloscope
Operation
This chapter gives an overview of some oscilloscope concepts that will
help you make better measurements. It discusses the relationship
between the time base setting and other time-dependent oscilloscope
functions, explains how to achieve the most accurate signal fidelity
through good probing practices, and describes how glitch detection
works.
Oscilloscopes with HP's MegaZoom Technology
The information in this chapter applies to both the HP 54645A and
HP 54645D Oscilloscope models because both are based on HP's
MegaZoom technology.
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