A&D Series 57ZZ Uživatelský manuál stáhnout pdf (Strana 21)

This section briefly describes the basic controls

found on analog and digitizing oscilloscopes.

Remember that some controls differ between analog

and digitizing oscilloscopes; your oscilloscope prob-

ably has controls not discussed here.

Display Controls

Display systems vary between analog oscilloscopes

and digitizing scopes, including both DSOs and

Digital Phosphor Oscilloscopes (DPOs). Common

controls include:

• An intensity control to adjust the brightness of

the waveform. As you increase the sweep speed

of an analog oscilloscope, you need to increase

the intensity level.

• A focus control to adjust the sharpness of the

waveform. Digitizing oscilloscopes may not have

a focus control.

• A trace rotation control to align the waveform

trace with the screen’s horizontal axis. The posi-

tion of your oscilloscope in the earth’s magnetic

field affects waveform alignment. Digitizing oscil-

loscopes may not have a trace rotation control.

• On DPOs, a contrast control.

• On many DSOs and on DPOs, a color palette

control to select trace colors and intensity grading

color levels.

• Other display controls may let you adjust the

intensity of the graticule lights and turn on or off

any on-screen information (such as menus).

Vertical Controls

Use the vertical controls to position and scale the

waveform vertically. Your oscilloscope also has

controls for setting the input coupling and other

signal conditioning, described later in this section.

Figure 28 shows a typical front panel and on-screen

menus for the vertical controls.

Position and Volts per Division

The vertical position control lets you move the

waveform up or down to exactly where you want it

on the screen.

The volts per division (usually written volts/div)

setting varies the size of the waveform on the screen.

A good general purpose oscilloscope can accurately

display signal levels from about 4 millivolts to 40

volts.

The volts/div setting is a scale factor. For example, if

the volts/div setting is 5 volts, then each of the eight

vertical divisions represents 5 volts and the entire

screen can show 40 volts from bottom to top

(assuming a graticule with eight major divisions). If

the setting is 0.5 volts/div, the screen can display 4

volts from bottom to top, and so on. The maximum

voltage you can display on the screen is the volts/div

setting times the number of vertical divisions.

(Recall that the probe you use, 1X or 10X, also influ-

ences the scale factor. You must divide the volts/div

scale by the attenuation factor of the probe if the

oscilloscope does not do it for you.)

Often, the volts/div scale has either a variable gain or

a fine gain control for scaling a displayed signal to a

certain number of divisions. Use this control to take

rise time measurements.

Input Coupling

Coupling means the method used to connect an elec-

trical signal from one circuit to another. In this case,

the input coupling is the connection from your test

circuit to the oscilloscope. The coupling can be set to

DC, AC, or ground. DC coupling shows all of an

input signal. AC coupling blocks the DC component

of a signal so that you see the waveform centered at

Figure 28. Typical Vertical controls.

The Controls

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