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TDS 620A, 640A & 644A User Manual
GlossaryĆ1
Glossary
AC coupling
A type of signal transmission that blocks the DC component of a
signal but uses the dynamic (AC) component. Useful for observing
an AC signal that is normally riding on a DC signal.
Accuracy
The closeness of the indicated value to the true value.
Acquisition
The process of sampling signals from input channels, digitizing the
samples into data points, and assembling the data points into a
waveform record. The waveform record is stored in memory. The
trigger marks time zero in that process.
Acquisition interval
The time duration of the waveform record divided by the record
length. The digitizing oscilloscope displays one data point for every
acquisition interval.
Active cursor
The cursor that moves when you turn the general purpose knob. It is
represented in the display by a solid line. The @ readout on the
display shows the absolute value of the active cursor.
Aliasing
A false representation of a signal due to insufficient sampling of high
frequencies or fast transitions. A condition that occurs when a
digitizing oscilloscope digitizes at an effective sampling rate that is
too slow to reproduce the input signal. The waveform displayed on
the oscilloscope may have a lower frequency than the actual input
signal.
Amplitude
The High waveform value less the Low waveform value.
AND
A logic (Boolean) function in which the output is true when and only
when all the inputs are true. On the digitizing oscilloscope, that is a
trigger logic pattern and state function.
Area
Measurement of the waveform area taken over the entire waveform
or the gated region. Expressed in voltĆseconds. Area above ground
is positive; area below ground is negative.