A&D Series 57ZZ Bedienungsanleitung PDF herunterladen (Seite 8)

What Can You Do With an

Oscilloscope?

Oscilloscopes are used by everyone from television

repair technicians to physicists. They are indispens-

able for anyone designing or repairing electronic

equipment.

The usefulness of an oscilloscope is not limited to

the world of electronics. With the proper transducer,

an oscilloscope can measure all kinds of phenomena.

A transducer is a device that creates an electrical

signal in response to physical stimuli, such as

sound, mechanical stress, pressure, light, or heat. For

example, a microphone is a transducer that converts

sound to an electrical signal.

An automotive engineer uses an oscilloscope to

measure engine vibrations. A medical researcher

uses an oscilloscope to measure brain waves. The

possibilities are endless.

Analog, Digital Storage, and Digital

Phosphor Oscilloscopes

Electronic equipment can be divided into two types:

analog and digital. Analog equipment works with

continuously variable voltages, while digital equip-

ment works with discrete binary numbers that may

represent voltage samples. For example, a conven-

tional phonograph is an analog device, while a

compact disc player is a digital device.

Oscilloscopes also come in analog and digitizing

types (see Figure 5). Fundamentally an analog oscil-

loscope works by applying the measured signal

voltage directly to an electron beam moving across

the oscilloscope screen (usually a cathode-ray tube,

CRT). The back side of the screen is treated with a

coating that phosphoresces wherever the electron

beam hits it. The signal voltage deflects the beam up

and down proportionally, tracing the waveform on

the screen. The more frequently the beam hits a

particular screen location, the more brightly it glows.

This gives an immediate picture of the waveform.

The range of frequencies an analog scope can display

is limited by the CRT. At very low frequencies, the

signal appears as a bright, slow-moving dot that’s

difficult to distinguish as a waveform. At high

frequencies, the CRT’s “writing speed” defines the

limit. When the signal frequency exceeds the CRT’s

writing speed, the display becomes too dim to see.

The fastest analog scopes can display frequencies up

to about 1 GHz.

In contrast, a digitizing oscilloscope uses an analog-

to-digital converter (ADC) to convert the voltage

being measured into digital information. The digi-

tizing scope acquires the waveform as a series of

Figure 3. The TDS 784D Digital Phosphor Oscilloscope front panel.

Figure 4. An example of scientific data gathered by an oscilloscope.

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