A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 24)

(called pretrigger viewing). Thus it determines the

length of the viewable signal both preceding and

following a trigger point.

Digitizing oscilloscopes can provide pretrigger

viewing because they constantly process the input

signal whether a trigger has been received or not. A

steady stream of data flows through the oscilloscope;

the trigger merely tells the oscilloscope to save the

present data in memory. In contrast, analog oscillo-

scopes only display the signal (that is, write it on the

CRT) after receiving the trigger.

Pretrigger viewing is a valuable troubleshooting aid.

For example, if a problem occurs intermittently, you

can trigger on the problem, record the events that led

up to it and, possibly, find the cause.

Zoom

Your oscilloscope may have special horizontal

magnification settings that let you display a magni-

fied section of the waveform on-screen. On a DSO,

the operation is performed on stored digitized data.

XY Mode

Most analog oscilloscopes have the capability of

displaying a second channel signal along the X-axis

(instead of time). This is known as XY mode. The XY

mode is further explained in the Measurement

Techniques section of this document.

The Z Axis

The Z axis brings a third dimension – intensity – to

the traditional waveform display. One application of

the Z-axis is to feed special timed signals into the

separate Z input to create highlighted “marker” dots

at known intervals in the waveform.

XYZ Mode

DPOs can use the Z input to create an XY display

with intensity grading. In this case, the DPO samples

the instantaneous data value at the Z input and uses

that value to intensify a specific part of the wave-

form. XYZ is especially useful for displaying the

polar patterns commonly used in testing wireless

communication devices.

Trigger Controls

The trigger controls let you stabilize repeating wave-

forms and capture single-shot waveforms. Figure 33

shows a typical front panel and on-screen menus for

the trigger controls.

Figure 33. Typical Trigger controls.

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