A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 42)

Megahertz (MHz)

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

Megasamples per second (MS/s)

A sample rate unit equal to one million samples

per second.

Microsecond (µs)

A unit of time equivalent to 0.000001 seconds.

Millisecond (ms)

A unit of time equivalent to 0.001 seconds.

Nanosecond (ns)

A unit of time equivalent to 0.000000001 seconds.

Noise

An unwanted voltage or current in an electrical

circuit.

Oscilloscope

An instrument used to make voltage changes

visible over time. The word oscilloscope comes

from “oscillate,” since oscilloscopes are often used

to measure oscillating voltages.

Peak (V

)

The maximum voltage level measured from a zero

reference point.

Peak-to-peak (V

p-p

)

The voltage measured from the maximum point of

a signal to its minimum point, usually twice the V

level.

Peak Detection

An acquisition mode for digital oscilloscopes that

lets you see the extremes of a signal.

Period

The amount of time it takes a wave to complete one

cycle. The period equals 1/frequency.

Phase

The amount of time that passes from the beginning

of a cycle to the beginning of the next cycle,

measured in degrees.

Probe

An oscilloscope input device, usually having a

pointed metal tip for making electrical contact with

a circuit element and a flexible cable for transmit-

ting the signal to the oscilloscope.

Pulse

A common waveform shape that has a fast rising

edge, a width, and a fast falling edge.

RMS

Root mean square.

Real-time Sampling

A sampling mode in which the oscilloscope

collects as many samples as it can as the signal

occurs.

Record Length

The number of waveform points used to create a

record of a signal.

Rise Time

The time taken for the leading edge of a pulse to

rise from its minimum to its maximum values

(typically measured from 10% to 90% of these

values).

Sample Point

The raw data from an ADC used to calculate wave-

form points.

Screen

The surface of the CRT upon which the visible

pattern is produced – the display area.

Signal Generator

A test device for injecting a signal into a circuit

input; the circuit’s output is then read by an oscil-

loscope.

Sine Wave

A common curved wave shape that is mathemati-

cally defined.

Single Shot

A signal measured by an oscilloscope that only

occurs once (also called a transient event).

Single Sweep

A trigger mode for displaying one screen full of a

signal and then stopping.

Slope

On a graph or an oscilloscope screen, the ratio of a

vertical distance to a horizontal distance. A posi-

tive slope increases from left to right, while a nega-

tive slope decreases from left to right.

Square Wave

A common wave shape consisting of repeating

square pulses.

Sweep

One horizontal pass of an oscilloscope’s electron

beam from left to right across the CRT screen.

Sweep Speed

A measurement of how fast the time base “sweeps”

the electron beam across the CRT screen.

Time Base

Oscilloscope circuitry that controls the timing of

the sweep. The time base is set by the seconds/divi-

sion control.

Trace

The visible shapes drawn on a CRT by the move-

ment of the electron beam.

Transducer

A device that converts a specific physical quantity

such as sound, pressure, strain, or light intensity

into an electrical signal.

Transient

A signal measured by an oscilloscope that only

occurs once (also called a single-shot event).

Trigger

The circuit that initiates a horizontal sweep on an

oscilloscope and determines the beginning point of

the waveform.

Trigger Holdoff

A control that inhibits the trigger circuit from

looking for a trigger level for some specified time

after the end of the waveform.

Trigger Level

The voltage level that a trigger source signal must

reach before the trigger circuit initiates a sweep.

Volt

The unit of electric potential difference.

Voltage

The difference in electric potential, expressed in

volts, between two points.

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