A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 23)

Math Operations

Your oscilloscope may also have operations to allow

you to add waveforms together, creating a new wave-

form display. Analog oscilloscopes combine the

signals while digitizing oscilloscopes create new

waveforms mathematically. Subtracting waveforms

is another math operation. Subtraction is possible

with analog oscilloscopes by using the channel

invert function on one signal and then using the add

operation. Digitizing oscilloscopes typically have a

subtraction operation available. Figure 31 illustrates

a third waveform created by adding two different

signals together.

Horizontal Controls

Use the horizontal controls to position and scale the

waveform horizontally. Figure 32 shows a typical

front panel and on-screen menus for the horizontal

controls.

Using the power of their internal processors, digi-

tizing oscilloscopes offer many advanced math oper-

ations: multiplication, division, integration, Fast

Fourier Transform, and more.

Position and Seconds per Division

The horizontal position control moves the waveform

left and right to exactly where you want it on the

screen.

The seconds per division (usually written as sec/div)

setting lets you select the rate at which the waveform

is drawn across the screen (also known as the time

base setting or sweep speed). This setting is a scale

factor. For example, if the setting is 1 ms, each hori-

zontal division represents 1 ms and the total screen

width represents 10 ms (ten divisions). Changing the

sec/div setting lets you look at longer or shorter time

intervals of the input signal.

As with the vertical volts/div scale, the horizontal

sec/div scale may have variable timing, allowing you

to set the horizontal time scale in between the

discrete settings.

Time Base Selections

Your oscilloscope has a time base usually referred to

as the main time base and it is probably the most

useful. Many oscilloscopes have what is called a

delayed time base – a time base sweep that starts

after a pre-determined time from the start of the

main time base sweep. Using a delayed time base

sweep allows you to see events more clearly or even

see events not visible with the main time base sweep

alone.

The delayed time base requires the setting of a delay

time and possibly the use of delayed trigger modes

and other settings not described in this book. Refer

to the manual supplied with your oscilloscope for

information on how to use these features.

Trigger Position

Horizontal trigger position control is only available

on digitizing oscilloscopes. The trigger position

control may be located in the horizontal control

section of your oscilloscope. It actually represents

“the horizontal position of the trigger in the wave-

form record.”

Varying the horizontal trigger position allows you to

capture what a signal did before a trigger event

Figure 31. Adding channels.

Figure 32. Typical Horizontal controls.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 43 44

Comentários a estes Manuais

Sem comentários

A&D Series 57ZZ Manual do Utilizador Página 23

Comentários a estes Manuais

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