A&D Series 57ZZ Bedienungsanleitung PDF herunterladen (Seite 13)

Learning a new skill often involves learning a new

vocabulary. This idea holds true for learning how to

use an oscilloscope. This section describes some

useful measurement and oscilloscope performance

terms.

Measurement Terms

The generic term for a pattern that repeats over time

is a wave – sound waves, brain waves, ocean waves,

and voltage waves are all repeating patterns. An

oscilloscope measures voltage waves. One cycle of a

wave is the portion of the wave that repeats. A wave-

form is a graphic representation of a wave. A voltage

waveform shows time on the horizontal axis and

voltage on the vertical axis.

Waveform shapes tell you a great deal about a signal.

Any time you see a change in the height of the wave-

form, you know the voltage has changed. Any time

there’s a flat horizontal line, you know that there’s

no change for that length of time. Straight diagonal

lines mean a linear change – rise or fall of voltage at

a steady rate. Sharp angles on a waveform mean

sudden change. Figure 13 shows some common

waveforms and Figure 14 shows some common

sources of waveforms.

Types of Waves

You can classify most waves into these types:

• Sine waves

• Square and rectangular waves

• Triangle and sawtooth waves

• Step and pulse shapes

• Complex waves

Sine Waves

The sine wave is the fundamental wave shape for

several reasons. It has harmonious mathematical

properties – it’s the same sine shape you may have

studied in high school trigonometry class. The

power line voltage at your wall outlet varies as a sine

wave. Test signals produced by the oscillator circuit

of a signal generator are often sine waves. Most AC

power sources produce sine waves. (AC stands for

alternating current, although the voltage alternates

too. DC stands for direct current, which means a

Oscilloscope Terminology

Figure 13. Common waveforms.

Figure 14. Sources of common waveforms.

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