Wavetek 132 Especificações descarregar pdf (Página 46)

D

=

2

V/div

TRIGGER:

Normal

VBEWTIME:

0.0s

DISPLAY

TYPE:

Variable

Full

Scale

c)

Set

up

the

Wavetek

142

to

produce

a

1kHz

square

wave

that

varies

between

0

and

+5

volts

(to

raise

the

upper

voltage,

adjust

the

attenuation

and

the

vernier).

Verify

the

square

wave

characteristics

by

connecting

the

Wavetek

output

to

DOP

channel

A.

Using

a

splitter,

send

the

square

wave

to

the

logic

input

of

the

Sample

and

Hold

chip

(pin

8),

as

well

as

channel

A.

This

signal

is

your

sample

pulse.

Connect

the

output

of

the

sample

and

hold

chip

to

channel

C

on

the

RAPIDS

system.

d)

Connect

the

DMM

to

a

free

power

supply

and

verify

that

you

can

manually

adjust

the

output

between

0

and

10

volts.

Turn

the

output

down

to

zero

volts

and

connect

to

the

input

of

the

Sample

and

Hold

chip

(pin

3)

while

maintaining

your

visual

display

on

the

DMM.

This

is

your

DC

input.

e)

Vary

the

DC

input

between

0

and

10

volts.

Q:

You

will

not

be

able

to

make

sense

of

the

output,

why

not?

What

is

the

sample

period

and

the

sample

pulse

duration?

Lower

the

sampling

frequency

to

.1

Hz.

Vary

your

DC

value.

Sketch

the

output.

Q:

What

is

happening?

What

kind

of

sampling

is

this?

f)

Using

a

Wavetek

132,

connect

5sin

2rcl000t

to

DOP

channel

B.

Q:

What

is

the

Nyquist

rate

of

this

signal?

Disconnect

the

DC

input

and

connect

the

sinusoid.

Vary

the

sample

pulse

frequency

and

print

plots

of

channels

A

B

and

C

(on

one

plot)

for

frequencies

below,

at

and

above

the

Nyquist

rate.

Q:

Attach

plots

and

comment

on

results.

Lab

2

Page

3

36

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