EZ Digital OS-3060D Specifiche Scaricare il pdf (Pagina 29)

[ 36J CAL TERMINAL

[37] G

ROUND

CONN

ECTO

2-2. Basic measurements

Outputs the square wave (O.5V, Ik

Hz)

calibrate the

probe

and

vertical

plifier.

Pro

vides an attachment p

oint

a separate

ground lead.

2-2-1. Connection of mea

surin

g sig

There are three differ

ent

methods f

observing sig

ls by

mean

the

oscilloscope as follows :

I. Method using lead wire

2. Met

hod

using coaxial

cable

3. Method u

sing

probe

for oscilloscope

Meth

od using lead wire

Thi

s method is the simple o

but it can only be used in the event

that

the signal level you i

nte

to measure is eit

her

high

level

signal

a low impe

nce circuit (such as

TTL

circ

uit).

At this

time, ground wires s

ll be

connec

ted between the

ground

ing terminal

of oscilloscope

and

the grounding surface of objects to be measured.

However, in case t

hat

the wire picks up hum and noise

beca

use the

wire is

not

shielded

the

meas

urement

may

often be difficult whe n

mea suring low level signals. As it is

hard

to have the wire

connected to

the

connector

of oscilloscope, using a b

ind

ing

adapte

for

BNC

is desirable.

Meth

od u

sing

coaxial cable

Thi

s method is the m

ost

ailin

one

which

is widely used

when

output c

onnect

or is

attached

to the mea

sur

eing

object

the

shield coating of coaxial cable prevents

hum

and

noise, accurate

measureme nt can be performed.

Since the coaxi

cable are usually fitted with

BNC

connectors

each

end and there are

man

y varieties

types by

their

purposes

, it

just would be advisable to usc a suitable

one

needed

When

meas

uri

ng high freq

uen

cy signals, a

termin

ator

having

impedance

the same value as the impedance of mea

surin

g signal sources s

be used, a

the coaxial cables should also be

matched

with the

terminator in terms

impedance. Even

when

using a long cable,

shou

ld you use the subject method, an accurate measurement could be

perfo

rmed

with

out

affect

ing

mea

sur

ent

signals.

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EZ Digital OS-3060D Specifiche Pagina 29

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