Glossary
&
Digitizing
The process of converting a continuous analog signal such as a wave
form to a set of discrete numbers representing the amplitude of the
signal at specific points in time. Digitizing is composed of two steps:
sampling and quantizing.
Direct current (DC)
An electric current that flows in only one direction with essentially
constant value.
Display system
The part of the oscilloscope that shows waveforms, measurements,
menu items, status, and other parameters.
Display menu
The setup menu on the 2221A Digital Storage Oscilloscope that allows
the user to select the type of cursor time readout, digital smoothing, or
data-point vectors.
Fall time
A measurement of the time it takes for trailing edge of a pulse to fall from
90% to 10% of its amplitude.
Frequency
A timing measurement that is the reciprocal of the period. Measured in
Hertz (Hz) where 1 Hz = 1 cycle per second.
Ground
A connection or reference to the zero voltage potential of earth ground.
GPIB {General Purpose Interface Bus)
An interconnection bus and protocol that allows you to connect multiple
instruments in a network under the control of a controller. Also known as
IEEE 488 bus. It transfers data with eight parallel data lines, five control
lines, and three handshake lines.
Graticule
A grid on the display screen that creates the horizontal and vertical axes.
You can use it to visually measure waveform parameters.
Hardcopy
An electronic copy of the display in a format useable by a printer or
plotter.
Hertz
The unit of frequency, one cycle per second.
Holdoff, trigger
A specified amount of time after a trigger signal that elapses before the
trigger circuit will accept another trigger signal. Holdoff helps to stabilize
the display of a signal that is otherwise difficult to trigger.
Intensity
Display brightness.
Knob
A rotary control.
G"3
2221A User Manual
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