HP 54645A User's And Service Manual page 27

Front-Panel Overview
Before you make measurements using the HP 54645A Oscilloscope and
HP 54645D Mixed-Signal Oscilloscope, you must first set up the instrument
using front-panel controls. Then, make the measurement and read the
display results. See the following pages for descriptions of controls.
The HP 54645A/D operates much like an analog scope, but it can do much
more. Spending a few minutes to learn some of this capability will take you a
long way toward more productive troubleshooting. The "MegaZoom Concepts
and Oscilloscope Operation" chapter has more detail on the things to
consider while operating your oscilloscope.
The grey keys on the front panel bring up softkey menus on the display that
allow access to oscilloscope features. The white keys are instant action keys
and menus are not associated with them.
Throughout this book, the front-panel keys are denoted by a box around
the name of the key, and softkeys are denoted by a change in the text
type. For example,
Display
panel, and Normal is a softkey appearing at the bottom of the display
directly above its corresponding softkey.
Important Oscilloscope Considerations
IMPORTANT: Read This Information!
It is extremely important that you read and understand the following information!
Using Single versus Run/Stop
The HP 54645A/D both have a Single key and a Run/Stop key. When you
press Run, the trigger processing and screen update rate are optimized over
the memory depth. Single acquisitions always use the maximum memory
available—at least twice as much memory as acquisitions captured in Run
mode—and the scope stores at least twice as many samples. At slow sweep
speeds, the oscilloscope operates at a higher sample rate when Single is used
to capture an acquisition, as opposed to running, due to the increased
memory available.
2-2
is the grey front-panel key on the front