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Glossary
TDS 620A, 640A & 644A User Manual
GlossaryĆ9
Side menu
Menu that appears to the right of the display. These selections
expand on main menu selections.
Side menu buttons
Bezel buttons to the right of the side menu display. They allow you
to select items in the side menu.
Slope
The direction at a point on a waveform. You can calculate the direcĆ
tion by computing the sign of the ratio of change in the vertical
quantity (Y) to the change in the horizontal quantity. The two values
are rising and falling.
Tek Secure
This feature erases all waveform and setup memory locations (setup
memories are replaced with the factory setup). Then it checks each
location to verify erasure. This feature finds use where this digitizing
oscilloscope is used to gather security sensitive data, such as is
done for research or development projects.
Time base
The set of parameters that let you define the time and horizontal axis
attributes of a waveform record. The time base determines when
and how long to acquire record points.
Trigger
An event that marks time zero in the waveform record. It results in
acquisition and display of the waveform.
Trigger level
The vertical level the trigger signal must cross to generate a trigger
(on edge trigger mode).
Vertical bar cursors
The two vertical bars you position to measure the time parameter of
a waveform record. The oscilloscope displays the value of the active
(moveable) cursor with respect to the trigger and the time value
between the bars.
Waveform
The shape or form (visible representation) of a signal.
Waveform interval
The time interval between record points as displayed.
XY format
A display format that compares the voltage level of two waveform
records point by point. It is useful for studying phase relationships
between two waveforms.
YT format
The conventional oscilloscope display format. It shows the voltage of
a waveform record (on the vertical axis) as it varies over time (on the
horizontal axis).