Sencore PS163 User Manual

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BASE

-

FREQUENCY

switch

is

10uSec/DIV,

so

this

pulse

is

1luSec

wide.

The

horizontal

distance

for

one

™

complete

cycle

of

the

drive

signal,

as

measured

be-

tween

points

A

and

C

is

6.3

divisions,

so

one

complete

cycle

is

63uSec

long.

10

uSec./

DIV

Fig.

6.

Time

measurement

with

PS163.

FREQUENCY

MEASUREMENTS

USING

CALIBRATED

TIME

BASE

The

formula

for

finding

frequency

if

time

is

known

is:

ٍ

ل

NEE

=

nn󰾰

Time

in

seconds

for

one

cycle󰾰

The

time

for

one

cycle

in

Fig.

6

was

63

uSec.,

or

.000063

seconds.

1

divided

by

.000063

equals

15,850Hz,

or

very

close

to

the

horizontal

frequency

of

15,750Hz.

FREQUENCY

MEASUREMENTS

USING

LISSAJOUS

FIGURES

The

sensitivity

and

bandwidth

of

the

PS163

VECTOR

mode

allow

this

type

of

measurement

to

be

made

from

even

the

output

of

an

RF

generator

up

to

5MHz.

1.

Connect

the

known

frequency

to

the

CHANNEL

B

input,

and

the

unknown

frequency

to

the

CHANNEL

A

input.

2.

Press

the

VECTOR

VERTICAL

INPUT

button,

and

adjust

the

PS163

controls

so

that

the

entire

pattern

is

visable

on

the

screen.

3.

Adjust

the

known

signal

frequency

so

that

the

pattern

holds

steady,

and

count

the

number

of

vert-

ical

and

horizontal

loops.

4.

Use

the

following

formula

to

find

the

unknown

frequency.

Known

frequency

X

Number

of

hor.

loops

Number

of

vert.

loops

The

examples

of

Fig.

7

show

several

patterns,

and

the

frequency

that

they

represent.

The

known

fre-

quency

used

in

the

example

is

600Hz.

OOD

CLM)

UNKNOWN

UNKNOWN

UNKNOWN

1200

Hz

1800

Hz

2400Hz

KNOWN

AND

UNKNOWN

FRE-

QUENCIES

300Hz

UNKNOWN

200

Hz

UNKNOWN

150

Hz

Fig.

7.

Typical

Lissajous

patterns.

FREQUENCY

MEASUREMENTS

USING

THE

MODULATED

RING

The

VECTOR

mode

of

the

25163

and

the

“Z”

Axis

input,

are

used

to

obtain

a

modulated

ring

pattern.

Simply

count

the

number

of

segments

and

multiply

by

the

known

frequency

to

find

the

unknown.

This

method

will

only

work

where

the

unknown

frequency

is

higher

than

the

known

frequency.

1.

Connect

the

signal

generator

to

a

phase

shift

net-

work

as

shown

in

Fig.

8.

The

network

shown

is

for

audio

frequencies

and

the

component

values

may

need

to

be

reduced

for

higher

frequencies.

KNOWN

SIGNAL

GENERATOR

UNKNOWN

FREQUENCY

70

"2*

AXIS

INPUT

Fig.

8.

Connections

for

frequency

measurements

using

modulated

ring

method.

2.

Connect

the

PS163

as

shown

and

press

the

VEC-

TOR

VERTICAL

INPUT

button.

17

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Sencore PS163 Specifications

General

Brand	Sencore
Model	PS163
Category	Test Equipment
Language	English

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