A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 41)

(Alternating Current) A signal in which the current

and voltage vary in a repeating pattern over time.

ADC

(Analog-to-Digital Converter) A digital electronic

component that converts an electrical signal into

discrete binary values.

Alternate Mode

A display mode of operation in which the oscillo-

scope completes tracing one channel before begin-

ning to trace another channel.

Amplitude

The magnitude of a quantity or strength of a signal.

In electronics, amplitude usually refers to either

voltage or power.

Analog Oscilloscope

One of three prevalent oscilloscope architectures

(the other two are DSOs and DPOs – see definitions

below). An instrument that creates a waveform

display by applying the input signal (conditioned

and amplified) to an electron beam moving across a

CRT screen. A chemical phosphor coating on the

CRT creates a glowing trace wherever the beam

hits.

Attenuation

A decrease in signal voltage during its transmission

from one point to another.

Averaging

A processing technique used by digital oscillo-

scopes to eliminate noise in a signal.

Bandwidth

A frequency range.

CRT

(Cathode-Ray Tube) An electron-beam tube in

which the beam can be focused on a luminescent

screen and varied in both position and intensity to

produce a visible pattern. A television picture tube

is a CRT.

Chop Mode

A display mode of operation in which small parts

of each channel are traced so that more than one

waveform can appear on the screen simulta-

neously.

Circuit Loading

The unintentional interaction of the probe and

oscilloscope with the circuit being tested,

distorting the signal.

Compensation

A probe adjustment for 10X probes that balances

the capacitance of the probe with the capacitance

of the oscilloscope.

Coupling

The method of connecting two circuits together.

Circuits connected with a wire are directly

coupled; circuits connected through a capacitor or

a transformer are indirectly (or AC) coupled.

Cursor

An on-screen marker that you can align with a

waveform to take accurate measurements.

(Direct Current) A signal with a constant voltage

and current.

Digital Phosphor Oscilloscope (DPO)

A digitizing oscilloscope that closely models the

display characteristics of an analog oscilloscope

while providing traditional digitizing oscilloscope

benefits (waveform storage, automated measure-

ments, etc.). The DPO uses a parallel processing

architecture to pass the signal to the raster-type

display. This provides intensity-graded viewing

characteristics.

Digital Storage Oscilloscope (DSO)

An oscilloscope that acquires signals via digital

sampling (using an analog-to-digital converter). It

uses a serial architecture that employs a single

processor to control acquisition, user interface, and

the raster display.

Division

Measurement markings on the CRT graticule of the

oscilloscope.

Earth Ground

A conductor that will dissipate large electrical

currents into the Earth.

Envelope

The outline of a signal’s highest and lowest points

acquired over many 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 repe-

tition.

Focus

The oscilloscope control that adjusts the CRT elec-

tron beam to control the sharpness of the display.

Frequency

The number of times a signal repeats in one

second, measured in Hertz (cycles per second). The

frequency equals 1/period.

Gigahertz (GHz)

1,000,000,000 Hertz; a unit of frequency.

Glitch

An intermittent error in a circuit.

Graticule

The grid lines on a screen for measuring oscillo-

scope traces.

Ground

1. A conducting connection by which an electric

circuit or equipment is connected to the earth to

establish and maintain a reference voltage level.

2. The voltage reference point in a circuit.

Hertz (Hz)

One cycle per second; the unit of frequency.

Kilohertz (kHz)

1000 Hertz; a unit of frequency.

Interpolation

A “connect-the-dots” processing technique to esti-

mate what a fast waveform looks like based on only

a few sampled points.

Glossary

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