EZ Digital OS-3060D Dokumentacja Pobierz pdf (Strona 41)

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Trigger selection

Triggering is the most co mplicated operation to perform for the

oscill

osco

pe because this instrument has many requirements that

have to be incidentally applied. and it requ ires an exact

synchronization as well.

Trigger mode selection

Auto trigger mode :

Since the synchronized sweep always

appear

s. even though there

exists no signal nor has the trigger adjusting been done

improperly granting that there exists a signal. you have

nothing to worry about that erro rs can possibly arise from the

ORM

However. where the signal frequency is less than 25Hz. the

AUTO

cannot

be used. At this time. the measurement has to be

done

the NORM positi

NO RM trigger mode :

CRT b

eam

appe

s only when the signal is synchronized.

This

trigger MODE

doc

s not cause the trace to appear in case that

there is no signal, that the synchroniza tion adjusting has b

een

one

improperly

and

that the venieal POSITION has been

incorrectly adj usted or that the YOLT

IY switch has been

improperly positi

oned

TV-V. TV-H trigger m

ode

The

cleanly synchronized waveform c

be observed with

separating the waveform such as a co

mpo

site video signal

(Fig. 2-7(a» into the horizontal

and

vertical

compon

ents by

adding

a TV sync separat

ion

circuit,

r the sync

hron

ization

vertical

compo

nents of the TV signal (Fig. 2-7(b» . set the

Trigger M

E switch switch to TV-Y. For the sync

hro

nization

horizontal components of the TV signal

(Fig

. 2-7(c

».

set the

Trigger MODE switch to TV-H. When the TRI

GGE

has

been

separated (Fig. 2-7

».

the TV sync polarity should be

negative/ - ).

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