Tektronix CSA8000B User Manual download pdf (Page 333)

CSA8000B & TDS8000B User Manual

Glossary- 1

Glossary

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.

Active cursor

The cursor that moves when you turn the general purpose knob. It is

represented in the display by a solid line.

Active (or Selected) view

The view in multiple view displays that is currently targeted for adjustment

by the horizontal controls. The front-panel button of the active view is

always lit amber.

Aliasing

A false representation of a signal due to insufficient sampling of high

frequencies or fast transitions. A condition that occurs when a sampling

instrument digitizes at an effective sampling rate that is too slow to

reproduce the input signal. The waveform displayed on screen may have a

lower frequency than the actual input signal.

Annotations

Lines displayed on screen to indicate measurement reference levels and

points that an automatic measurement is using to derive the measurement

value.

Attenuation

The degree the amplitude of a signal is reduced when it passes through an

attenuating device such as a probe or an external attenuator. That is, the ratio

of the input measure to the output measure. For example, a 10X attenuator

will attenuate, or reduce, the input voltage of a signal by a factor of 10.

Automatic measurement

An automatic measurement of a parameter and its numeric readout that the

instrument takes and updates directly from a channel, math, or reference

waveform in real time, without operator intervention.

Automatic trigger mode

A trigger mode that causes the instrument to automatically acquire if

triggerable events are not detected within a specified time period.

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Tektronix CSA8000B User Manual Page 333