Tektronix 222PS, Operator'S Manual

Page: 219 / 232

Glossary
222PS Operator Manual
GĆ7
TimeĆOut Feature
A feature that shuts off the instrument after two minutes without
changes to the controls, when the instrument is running under
battery power. This feature prevents the battery from being
discharged when the instrument is left unattended.
Trigger
The event that tells the oscilloscope to start acquiring and displayĆ
ing a waveform.
Trigger Coupling
See Channel Coupling .
Trigger Level
The voltage threshold that a signal must cross in order for the
instrument to trigger.
Trigger Light
A light on the 222PS front panel, labeled TRIG'D , that indicates
when the instrument has acquired a trigger.
Trigger Mode
The way in which the instrument acquires a trigger. The 222PS
has four trigger modes:normal, auto level, auto baseline, and
singleĆsequence. (See those definitions.)
Trigger Slope
The parameter that determines whether the oscilloscope triggers
as the voltage of the displayed signal is rising or falling.
Trigger Source
The signal that provides the trigger event. The trigger source can
be a signal acquired through either channel or an external trigger.
Trigger Position
The location of the trigger event relative to the waveform on the
display. When the 222PS is in store mode, the trigger position can
be at the beginning, in the middle, or at the end of the waveform.
This allows you to view the waveform data distributed around the
trigger point in three ways.
Uncalibrated Channel
A channel manipulated with the variable voltsĆperĆdivision ( VAR
VOLTS/DIV ) knob. This knob allows you to scale a waveform
vertically so that it takes up an arbitrary number of vertical diviĆ
sions. However, after this manipulation, the exact number of
voltsĆperĆdivision for that signal is unknown.
Glossary
222PS Operator Manual
GĆ7
TimeĆOut Feature
A feature that shuts off the instrument after two minutes without
changes to the controls, when the instrument is running under
battery power. This feature prevents the battery from being
discharged when the instrument is left unattended.
Trigger
The event that tells the oscilloscope to start acquiring and displayĆ
ing a waveform.
Trigger Coupling
See Channel Coupling .
Trigger Level
The voltage threshold that a signal must cross in order for the
instrument to trigger.
Trigger Light
A light on the 222PS front panel, labeled TRIG'D , that indicates
when the instrument has acquired a trigger.
Trigger Mode
The way in which the instrument acquires a trigger. The 222PS
has four trigger modes:normal, auto level, auto baseline, and
singleĆsequence. (See those definitions.)
Trigger Slope
The parameter that determines whether the oscilloscope triggers
as the voltage of the displayed signal is rising or falling.
Trigger Source
The signal that provides the trigger event. The trigger source can
be a signal acquired through either channel or an external trigger.
Trigger Position
The location of the trigger event relative to the waveform on the
display. When the 222PS is in store mode, the trigger position can
be at the beginning, in the middle, or at the end of the waveform.
This allows you to view the waveform data distributed around the
trigger point in three ways.
Uncalibrated Channel
A channel manipulated with the variable voltsĆperĆdivision ( VAR
VOLTS/DIV ) knob. This knob allows you to scale a waveform
vertically so that it takes up an arbitrary number of vertical diviĆ
sions. However, after this manipulation, the exact number of
voltsĆperĆdivision for that signal is unknown.