Oscilloscope Glossary E-P
Effective Bits – A measure of a digital oscilloscope's ability to accurately
reconstruct a sine wave signal’s shape. This measurement compares the
oscilloscope's actual error to that of a theoretical “ideal” digitizer.
Envelope – The outline of a signal’s highest and lowest points acquired
over many displayed waveform repetitions.
Equivalent-time Sampling – A sampling mode in which the oscilloscope
constructs a picture of a repetitive signal by capturing a little bit of
information from each repetition. Two types of equivalent-time sampling:
random and sequential.
Frequency – The frequency equals 1/period.
Frequency Response – A Bode plot of input to output response of an
amplifier or attenuator for sine waves with constant amplitudes at
different frequencies over a frequency range.
Gain Accuracy - An indication of how accurately the vertical system
attenuates or amplifies a signal, usually represented as a percentage error.
Glitch - An intermittent, high-speed error in a circuit.
Graticule - The grid lines on a screen for measuring oscilloscope traces.
Horizontal Sweep – The action of the horizontal system that causes a
waveform to be drawn.
Intensity Grading – Frequency-of-occurrence information that is
essential to understanding what the waveform is really doing.
Interpolation – A “connect–the–dots” processing technique to estimate
what a fast waveform looks like based on only a few sampled points.
Two types: linear and sin x/x.
Loading – The unintentional interaction of the probe and oscilloscope with
the circuit being tested which distorts a signal.
Mixed-Signal Oscilloscope (MSO) - Digital oscilloscopes that have a
larger number of channels for viewing both analog and
digital signals together. MSO scopes typically have two tor four analog channels and at
least 8 bits of vertical resolution. There are usually 16 digital channels
but they typically have only 1 bit of vertical resolution.
Peak (Vp) – The maximum voltage level measured from a zero
Peak Detection – An acquisition mode available with digital oscilloscopes
that enables you to observe signal details that may otherwise be missed,
particularly useful for seeing narrow pulses spaced far apart in time.
Peak-to-peak (Vp-p) – The voltage measured from the maximum point of a
signal to its minimum point.