Glossary
TDS 340A, TDS 360 & TDS 380 User Manual
Glossary–3
Ground (GND) Coupling
Coupling option that disconnects the input signal from the vertical system.
Hard Copy
An electronic copy of the display in a format useable by a printer or plotter.
Holdoff, Trigger
A specified amount of time after a trigger signal that elapses before the
trigger circuit will accept another trigger signal. This helps ensure a stable
display.
Horizontal Bar Cursors
The two horizontal bars that you position to measure the voltage parameters
of a waveform. The oscilloscope displays the value of the active (moveable)
cursor with respect to ground and the voltage value between the bars.
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.
Normal Trigger Mode
A mode on which the oscilloscope does not acquire a waveform record
unless a valid trigger event occurs. It waits for a valid trigger event before
acquiring waveform data.
Pixel
A visible point on the display. The oscilloscope display is 640 pixels wide
by 480 pixels high.
Pop-Up Menu
A submenu of a main menu. Pop-up menus temporarily occupy part of the
waveform display area and present additional choices associated with the
main menu selection. You can cycle through the options in a pop-up menu
by repeatedly pressing the main menu button underneath the pop-up.
Pretrigger
The specified portion of the waveform record that contains data acquired
before the trigger event.
Record Length
The specified number of samples in a waveform.
Reference Memory
Memory in an oscilloscope used to store waveforms or settings. You can use
that waveform data later for processing. The oscilloscope saves the data even
if you turn it off or unplug it.
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