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I

I

I

I

I

SECT

I

ON

I I I

--

-

--

- ~-- --- -- --- ---- ---

---

-- --- -------------------

CALIBRATION

240-0664

3.2.4

S QUA

RE

J

VEFORM

S YMMETRY

(A)

SET

THE

CONTROLS

OF

THE

OSCILLOSCOPE

AS

FOLLOWS:

VE

RTIC

AL S EN S

ITIVITY

IN P UT

COUPLING

SWEEP

TIMING

TR

I

GG

ER

10

v/cM

DC

1 '

MS

E

c/

CM

INTERN

AL

(s)

CONNECT

THE

VERTICAL

AMPLIFIER

OF

THE

OSCILLOSCOPE

TO

THE

S ~ UA

RE

WAVE

OUTPUT

TERMINAL

OF

THE

FUNCTION

GENERATOR.

AD-

JUST

THE

OSCILLOSCOPE

TRIGGERING

SO

THAT

A

CHANGE

FROM

PLUS

TO

MINUS

INTERNAL

TRIGGERING

WILL

CAUSE

A

STATIONARY

POLARITY

REVERSAL

OF ONE

CYCLE

OF

THE

SQUARE

WAVE.

(c)

POSITI

ON

THE

RISE

OR

FALL

OF

THE

SQUARE

WAVE TO

THE

CENTER

OF

THE

GRATICULE

AND

TURN

THE

OSCILLOSCOPE

MAGNIFIER

TO

ON.

(D)

W

HILE

SWITCHING

THE

OSCILLOSCOPE

TRIGGER

BETWEEN

PLUS

AND

MINUS

INTERNAL

TRIGGERING,

A

DJUST

THE

S~

U

ARE

SYMMETRY

(X10)

R111

FOR

NO

SHIFT

IN

THE

WAVEFORM

(EQUAL

POSITIVE

AND

NEG-

ATIVE

PORTIONS

REFERE

NCED TO

TIME).

(E)

SET

THE

FUNCTION

GENERATOR

CYCLES/

S

EC

DIAL

TO

X1,

THE

MUL-

TIPLIER

TO

100

AND

THE

osc1LLOSCOPE

swEEP

TO 1

MSEc/cM.

(F)

REPEAT

THE

PROCEDURE

IN

3.2.4

(D)

ADJUSTING

THE

SQUARE

S Y

MM

ETRY

(X1)

R120

FOR

NO

SHIFT

IN

THE

WAVEFORM.

3.2.5

FIN

AL

TIMING

(A)

S

ET

THE

FUNCTION

GENERATOR

CONTROLS

AS

FOLLOWS:

MU

LTIPLIER

CYCLE

S/ S EC

DIAL

10

10

(s)

SET

THE

OSCILLOSCOPE

CONTROLS

AS

FOLLOWS:

(

c)

VERTIC

AL S EN S

ITIVITY

INPUT

COUPLING

SI.

.JEEP

TIMING

TR

I

GGER

MA

GNIFIER

10

v/cM

DC

10

MSEc/cM

EXTERN

AL

(NEGATIVE)

OFF

CONNECT

THE

EXT

ERNA

L

TRIGGER

INPUT

OF

THE

OSCILLOSCOPE

TO

THE

SQU

A

RE

WAVEFORM

OUTPUT

TERMINAL

OF

THE

FUNCTION

GEN-

ERATOR.

(D)

CONNECT

THE

VERTICAL

AMPLIFIER

OF

THE

OSCILLOSCOPE

TO

THE

TRI

ANGE

WAVEFORM

OUTPUT

TERMIN

AL

OF

THE

F UNCT I

ON

GENERATOR.

(E)

RECHECK

THE

TIMING,

AND

IF

NECESSARY,

READJUST

THE

MAIN

TIMING

A

DJ

(PARAGRAPH

3.2.3

(s)).

(F)

ADJUST

THE

CYCLE

S

/SEC

DIAL

TOWARD

X1,

UNTIL

1

TRIANGLE

APPEARS

FOR

10

CM

OF

SWEEP

ON

THE

OSCILLOSCOPE.