A&D Series 57ZZ Uživatelský manuál stáhnout pdf (Strana 7)

What is an oscilloscope, what can you do with it,

and how does it work? This section answers these

fundamental questions.

The oscilloscope is basically a graph-displaying

device – it draws a graph of an electrical signal (see

Figure 1). In most applications the graph shows how

signals change over time: the vertical (Y) axis repre-

sents voltage and the horizontal (X) axis represents

time. The intensity or brightness of the display is

sometimes called the Z axis. This simple graph can

tell you many things about a signal. Here are a few:

• You can determine the time and voltage values of

a signal

• You can calculate the frequency of an oscillating

signal

• You can see the “moving parts” of a circuit repre-

sented by the signal

• You can tell how often a particular portion of the

signal is occurring relative to other portions

• You can tell if a malfunctioning component is

distorting the signal

• You can find out how much of a signal is direct

current (DC) or alternating current (AC)

• You can tell how much of the signal is noise and

whether the noise is changing with time

An oscilloscope’s front panel includes a display

screen and the knobs, buttons, switches, and indica-

tors used to control signal acquisition and display.

Front-panel controls normally are divided into

Vertical, Horizontal, and Trigger sections, and in

addition, there are display controls and input

connectors. See if you can locate these front-panel

sections in Figures 2 and 3 as well as on your

oscilloscope.

Figure 2. The TAS 465 Analog Oscilloscope front panel.

Figure 1. X, Y, and Z Components of a displayed waveform.

The Oscilloscope

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A&D Series 57ZZ Uživatelský manuál Strana 7