HP 54645A User's And Service Manual page 13

Getting Started
When you use the HP 54645A/D Oscilloscopes to help test and
troubleshoot your systems, you will do the following:
Prepare the oscilloscope by connecting it to power and setting up
the handle and screen brightness as desired.
Define the measurement problem by understanding the parameters
of the system you wish to test and the expected system behavior.
Set up channel inputs by connecting the probes to the appropriate
signal and ground nodes in the circuit under test.
Define the trigger to reference the waveform data to a specific
event of interest.
Use the oscilloscope to acquire data, either in continuous or
single-shot fashion.
Examine the data and make measurements on it using various
features.
Save the measurement or configuration for later re-use or
comparison with other measurements.
Repeat the process as necessary until you verify correct operation or
find the source of the problem.
MegaZoom Technology Operates with Untriggered Data
With the MegaZoom technology built into the HP 54645A/D, you can
operate the oscilloscope with untriggered data. All you do is press Run
or Single while in Auto trigger mode, then examine the data to set up
a trigger.
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