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Glossary
TDS 620A, 640A & 644A User Manual
GlossaryĆ5
Interpolation
The way the digitizing oscilloscope calculates values for record
points when the oscilloscope cannot acquire all the points for a
complete record with a single trigger event. That condition occurs
when the oscilloscope is limited to real time sampling and the time
base is set to a value that exceeds the effective sample rate of the
oscilloscope. The digitizing oscilloscope has two interpolation opĆ
tions: linear or sin(x)/x interpolation.
Linear interpolation calculates record points in a straightĆline 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.
Intensity
Display brightness.
Knob
A rotary control.
Logic state trigger
The oscilloscope checks for defined combinatorial logic conditions
on channels 1, 2, and 3 on a transition of channel 4 that meets the
set slope and threshold conditions. If the conditions of channels 1,
2, and 3 are met then the oscilloscope triggers.
Logic pattern trigger
The oscilloscope triggers depending on the combinatorial logic
condition of channels 1, 2, 3, and 4. Allowable conditions are AND,
OR, NAND, and NOR.
Low
The value used as 0% in automated measurements (whenever high
ref, mid ref, and low ref values are needed as in fall time and rise
time measurements). May be calculated using either the min/max or
the histogram method. With the min/max method (most useful for
general waveforms), it is the minimum value found. With the histoĆ
gram method (most useful for pulses), it refers to the most common
value found below the mid point. See Appendix B: Algorithms for
details.
Main menu
A group of related controls for a major oscilloscope function that the
oscilloscope displays across the bottom of the screen.
Main menu buttons
Bezel buttons under the main menu display. They allow you to select
items in the main menu.
Maximum
Amplitude (voltage) measurement of the maximum amplitude.
Typically the most positive peak voltage.