eXact 240 - 3.3 Triangle Waveform Linearity

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CALIBRATION

3.3

3.2.6

FIN

AL

FUNCTION

GENERATOR

TI

MING

CHECK

(coNTINUED)

(B)

MID-FREQUENCY

TIMING

CHECK

(1)

SET

THE

osc1LLoscoPE

SWEEP

TI

MING

TO

100µsEc/cM,

THE

FUNCTIO

N

GE

NERAT

OR

MULTIP

LI

ER

SWITCH

TO

100

AND

THE

CYCLE

S/

SEC

DIAL

TO

X

10.

(2)

VERIFY

THAT

THE

FUNCTION

GENERATOR

IS

CORRECTLY

TIMED

AT

1000

CYCLES

PER

SE

COND

BY

OBSERVING

ONE

CYCLE

OF

THE

TRIANGLE

WAVEFORM FOR

10

CM

OF

SWEEP

ON

THE

OSCIL-

LOSCOPE.

(3)

SET

THE

osc1LLoscoPE

SWEEP

TIMING

TO

1

MSEc/cM,

THt

FUNCTION

GENE

RATOR

MULTIPLIER

SWITCH

TO

100

AND

THE

CYCLES/

S EC

DIAL

To

x1.

( 4 ) V E R I F Y T H A T T H E F U N C T I

ON

G E N E R A T O R ·I S C

OR

R E C T L Y T I M E D

AT

100

CYCLES

PE

R

SECOND

BY

OBSERVING

ONE

CYCLE

OF

THE

TRIANGLE

WAVEFORM

FOR

10

CM

OF

SWEEP

ON

THE

OSCILLOSCOPE

.

(c)

Low

FREQUENCY

TIMING

CHECK

(1)

SET

THE

OSCILLO

S

COPE

SW

EE

P

TIMING

TO

10

MSEC/CM,

THE

FUNCTION

GENERATOR

MULTIPLIER

SWITCH

TO 1

AND

THE

CYCLE

S

/SEC

DIAL

TO

X10.

(2)

VERIFY

THAT

THE

FUNCTION

GENERATOR

IS

CORRECTLY

TIMED

AT

10

CYCLES

PER

SECOND

BY

OBSERVING

ONE

CYCLE

OF

THE

TRIANGLE

WAVEFORM FOR

10

CM

OF

SWEEP

ON

THE

OSCILLOSCOPE.

(3)

SET

THE

osc1LLoscoPE

SW

EEP

TIMING

To

100

MsEc/cM,

THE

FUNCTION

GENERATOR

MULTIPLIER

SWITCH

TO

1

AND

THE

CYCLE

S

/SEC

DIAL

To

x1.

(4)

VERIFY

THA

7

TH

E

FUNCTION

GEN ERATOR

IS

CORRECTLY

TIMED

AT

1

CYCLE

PER

SECOND

BY

OBSERVING

ONE

CYCLE

OF

THE

TRIANGLE

WAV

E FORM

FOR

10

CM

OF

SWEEP

ON

T

HE

OSCILLOSCOPE.

(D)

REPEAT

STEPS

3.2.6

(c)

1 THROUGH 4

FOR

FREQUENCIES

.1,

.01,

AND

•

001

•

TRIANGLE

LINEARITY

NOTE:

IN

TH

IS

CHECK

IT

IS

VERY

IMPORTANT

THAT

AN

OSCILLOSCOPE

WHOSE

CRT

GEOMETRY

AND

LINEARITY

ARE

CALIBRATED

TO

1/2%

OR

BETTER

BE

USED·

(CHECK

THE

OSCILLOSCOPE

LINEARITY

BY

OBSERVING

THE

OSCILLOSCOPE'S

S

AW

TOOTH

OUT.)

3 .

3.1

PRELIMIN

AR

Y S

ETTINGS

A

ND

A

DJUSTM

EN

T S

(A)

SET

THE

OSCILLOSCOPE

CONTROLS

AS

FOLLOWS!

VERTICAL

SENSITIVITY

SWEEP

TIMING

INPUT

COUPLING

TRIGGER

10

v/cM

0 . 5

MSEc/cM

DC

EXTERNAL

(NEGATIVE)