Glossary
Glossary–10
TDS 500B, TDS 600B, & TDS 700A User Manual
Sampling
The process of capturing an analog input, such as a voltage, at a discrete
point in time and holding it constant so that it can be quantized. Two general
methods of sampling are: real-time sampling and equivalent-time sampling.
Setup/Hold trigger
A mode in which the oscilloscope triggers when a data source changes state
within the setup or hold time relative to a clock source. Positive setup times
precede the clock edge; positive hold times follow the clock edge. The clock
edge may be the rising or falling edge.
Select button
A button that changes which of the two cursors is active.
Selected waveform
The waveform on which all measurements are performed, and which is
affected by vertical position and scale adjustments. The light over one of the
channel selector buttons indicates the current selected waveform.
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.
Slew Rate trigger
A mode in which the oscilloscope triggers based on how fast a pulse edge
traverses (slews) between an upper and lower threshold. The edge of the
pulse may be positive, negative, or either. The oscilloscope can trigger on
slew rates faster or slower than a user-specified rate.
Slope
The direction at a point on a waveform. You can calculate the direction 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 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.
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