Wavetek 132 Especificações descarregar pdf (Página 53)

Lab

2:

Sampling

and

Analog

to

Digital

Conversion

Solutions

le)

Q:

You

will

not

be

able

to

make

sense

of

the

output,

why

not?

What

is

the

sample

period

and

the

sample

pulse

duration?

A:

The

sample

pulses

are

too

short

to

see

a

response.

The

sample

period,

T

=

1

Hz.

The

duty

cycle,

d=0.5.

The

pulse

duration,

T

=dT=(.5)(l)=5

sees.

Q:

What

happens

when

you

vary

the

DC

signal?

What

kind

of

sampling

is

this?

A:

The

DC

value

can

only

be

varied

during

the

actual

pulse

of

the

sample

signal.

At

zero

volts

(sample

pulse)

the

output

is

not

sampled.

This

is

natural

sampling.

If)

Q:

What

is

the

Nyquist

rate

of

5

sin

27i(1000)t?

A:

f

=

2f1=2000Hz

■

*s

"o

Q:

Attach

plots

and

comment

on

results.

A:

The

plots

are

attached.

Below

the

Nysquist

rate,

the

shape

of

the

signal

is

unidentifiable.

The

signal

is

aliased.

At

the

Nyquist

rate,

the

shape

of

the

signal

becomes

apparent.

Above

the

Nyquist

rate,

the

shape

of

the

signal

becomes

more

obvious

as

the

sampling

frequencies

get

higher.

Lab

2

Solutions

Page

1

43

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