Tektronix CSA8000B - Manual (Page 338)

Glossary
Glossary- 6 CSA8000B & TDS8000B User Manual
when horizontal scale adjustments are made. The horizontal reference point
remains anchored as the rest of the waveform grows or shrinks around it.
Icon
See Channel Icon.
Initialize
Setting the instrument to a completely known, default condition by pressing
executing a Default Setup.
Internal clock
A trigger source that is synchronized to the internal clock, with a selectable
repetition rate. It is most often used with TDR to synchronize the generation
of TDR step pulses with subsequent acquisition.
Interpolation
The way the instrument calculates additional values to display when the
acquired record length is less than 500 points. The instrument has three
interpolation options: linear, sin(x)/x, or none.
Linear interpolation calculates record points in a straight-line fit between the
actual values acquired. Sin(x)/x computes record points in a curve fit between
the actual values acquired. It assumes all the interpolated points fall in their
appropriate point in time on that curve. None displays only the acquired data
points.
Knob
A rotary control.
Live Waveforms
Waveforms that can update as the acquisition system acquires data. Channel
waveforms are live waveforms; reference waveforms are not. Math
waveforms are live if they contain live waveforms in their expressions:
C1 + R1 defines a live math waveform; R1 + R2 does not.
Low
The value used as the 0% level in amplitude measurements, such as Peak and
+Overshoot. See Levels Used in Taking Amplitude, Timing, and Area
Measurements on page 3--79 for more details.
LowRef
The waveform low reference level. Used in fall and rise time calculations.
Typically set to 10%. See Levels Used in Taking Amplitude, Timing, and
Area Measurements on page 3--79 for more details.
Math Waveform
A waveform defined by a combination of one or more operands (channel
waveforms, reference waveforms, and automatic measurement scalars). Math
waveforms may also contain math operators and functions.