Wavetek 132 Especificações descarregar pdf (Página 48)

the

spectra

averaged

equals

eight.

You

may

want

to

plot

both

dB

scale

and

volts

scale

to

make

measurements

easier.

Label

the

baseband

frequency

and

specra

components

(freq

and

amp)

Q:

How

do

these

compare

to

the

calculated

results

in

part

If?

Vary

the

frequency

of

the

input

while

viewing

the

spectrum

of

the

output

of

the

LPF.

Q:

Does

this

behave

as

expected?

Q:

What

is

the

cutoff

frequency

of

the

LPF?

Part

2:

D-AandA-D

a)

The

D-A

and

A-D

circuits

have

been

pre-wired

for

you.

Obtain

a

sketch

of

this

circuit

from

the

lab

technicians.

Make

the

appropriate

±

15

volt

and

5

volt

connections.

Connect

a

DC

input

to

the

board

and

the

DMM,

as

was

done

in

part

la.

Connect

the

analog

out

to

a

second

DMM

ensuring

0.001

accuracy.

Using

a

Wavetek

132,

connect

a

0

to

5

volt,

10

kHz

sine

wave

to

the

sample

input.

b)

Vary

the

voltage

in,

monitor

the

analog

out.

The

output

should

closely

follow

the

input

but

be

opposite

in

sign.

Verify

that

the

digital

output

is

representative

of

the

input.

Q:

Calculate

the

quantization

step

size

for

this

signal

(0

to

10

volt

analog

input

converted

to

an

eight

bit

digital

output).

Q:

Measure

the

quantization

step

size

and

compare

with

your

calculations.

Q:

Draw

a

quantizing

characteristic

plot

for

the

first

three

bits.

c)

Apply

the

a

5sin2n

1000t

signal

to

the

analog

input

and

view

it

on

the

RAPIDS

oscilloscope.

Connect

the

analog

output

to

a

different

channel

on

the

oscilloscope.

Q:

What

is

happening

at

the

output?

What

happens

when

you

vary

the

frequency?

Lab

2

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5

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