Wavetek 132 Spezifikationen PDF herunterladen (Seite 118)

c)

Display

a

100

kHz

sine

wave

with

an

amplitude

of

.25

mv

from

the

Wavetek

186,

on

the

oscilloscope

channel

2.

Adjust

the

Wavetek

186

settings

to:

Waveform:

sinusoid

norm

symmetry:

norm

Gen

mode:

cont

atten:

20dB

Adjust

the

oscilloscope

settings

(see

lab

1

for

operation)

to:

Chl:5v/div,AC

Ch2:

500mv/div,AC

After

you

have

verified

that

the

signal

looks

as

expected,

connect

it

in

series

with

the

capacitor

that

is

connected

to

pin

2.

Maintain

a

reading

of

the

signal

on

channel

2.

Monitor

the

output

of

the

free

running

PLL

from

pin

4

on

channel

1

of

the

oscilloscope.

Adjust

the

vertical

position

of

each

signal

so

they

do

not

overlap.

Vary

the

frequency

of

the

186

output

and

watch

the

output

pulse

of

the

PLL.

During

the

capture

and

lock

range,

the

frequency

of

the

output

should

be

equal

to

the

frequency

of

the

input

(ie:

it

is

locked).

Q:

By

varying

the

frequency,

determine

the

range

that

the

PLL

remains

locked

(upper

and

lower

frequencies).

Bring

the

frequency

outside

the

lower

lock

frequency.

Slowly

increase

the

frequency

to

determine

the

lower

capture

frequency

at

which

the

PLL

follows

the

input

frequency.

Repeat

for

upper

capture

frequency.

Determine

the

center

frequency.

Q:

What

is

the

amplitude

of

the

output?

d)

Q:

Recalculate

the

theoretical

values

of

f

0

,

f„

and

£

using

the

actual

values

of

the

resistors

and

capacitors.

Compare

these

values

to

the

measured

frequencies.

Lab

5

Page

3

108

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