A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 17)

This section briefly describes how to set up and start

using an oscilloscope – specifically, how to ground

the oscilloscope, set the controls in standard posi-

tions, and compensate the probe.

Proper grounding is an important step when setting

up to take measurements or work on a circuit.

Properly grounding the oscilloscope protects you

from a hazardous shock and grounding yourself

protects your circuits from damage.

Grounding

Ground the Oscilloscope

Grounding the oscilloscope is necessary for safety. If

a high voltage contacts the case of an ungrounded

oscilloscope, any part of the case including knobs

that appear insulated, can give you a shock.

However, with a properly grounded oscilloscope, the

current travels through the grounding path to earth

ground rather than through you to earth ground.

To ground the oscilloscope means to connect it to an

electrically neutral reference point (such as earth

ground). Ground your oscilloscope by plugging its

three-pronged power cord into an outlet grounded to

earth ground.

Grounding is also necessary for taking accurate

measurements with your oscilloscope. The oscillo-

scope needs to share the same ground as any circuits

you are testing.

Some oscilloscopes do not require the separate

connection to earth ground. These oscilloscopes

have insulated cases and controls, which keeps any

possible shock hazard away from the user.

Ground Yourself

If you are working with integrated circuits (ICs), you

also need to ground yourself. Integrated circuits have

tiny conduction paths that can be damaged by static

electricity that builds up on your body. You can ruin

an expensive IC simply by walking across a carpet or

taking off a sweater and then touching the leads of

the IC. To solve this problem, wear a grounding strap

(see Figure 23). This strap safely sends static charges

on your body to earth ground.

Setting the Controls

After plugging in the oscilloscope, take a look at the

front panel. It is divided into three main sections

labeled Vertical, Horizontal, and Trigger (see Figure

24). Your oscilloscope may have other sections,

depending on the model and type (analog or digi-

tizing).

Notice the input connectors on your oscilloscope.

This is where you attach probes. Most oscilloscopes

have at least two input channels and each channel

Setting Up

Figure 23. Typical wrist type grounding strap.

Figure 24. Front-panel control sections of a typical oscilloscope.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 43 44

Comentários a estes Manuais

Sem comentários

A&D Series 57ZZ Manual do Utilizador Página 17

Comentários a estes Manuais

Manuais e produtos relacionados com Medição, teste e controlo A&D Series 57ZZ