Iwatsu SC7101 - DIFF Calculation; Measurement Using an External Reference Oscillator; Use as the Secondary Frequency Standard

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Section

3

Measuring

Procedures

3-3-2

DIFF

Calculation

Performs

calculation

of

difference

between

the

measured

value

X

and

the

reference

value

Xref.

Register

the

reference

value

Xref

in

ad-

vance.

Measurement

1.

Apply

the

reference

value

Xref.

2.

Press

the

|

DIFF}

key

(LED

turns

on).

3.

Press

the

[RESET]

key

and

register

the

refer-

ence

value

Xref.

4.

Apply

the

measured

signal

X.

5.

"X-Xref"

is

displayed

on

the

data

display.

<Note>

*

To

re-register

the

reference

value

Xref,

apply

the

signal

of

the

new

reference

value

and

then

press

the

[Rt

key.

Registered

Xref

values

remain

unchanged

even

when

CHECK

mode,

MEASURE

mode,

INPUT

SELECT,

SAMPLE

RATE

and

TIME

BASE

are

changed.

When

DIFF

calculation

is

turned

on

again,

after

once

turned

off,

the

Xref

which

has

been

pre-

viously

registered,

remains

unerased.

(When

using

the

same

value

as

the

Xref,

no

new

re-

gistration

is

required).

Turning

on

line

voltage,

clears

Xref,

resetting

to

0.

SC-7101/SC-7102

3-4

MEASUREMENT

USING

AN

EXTERNAL

REFERENCE

OSCILLATOR

The

instrument

allows

measurement

of

higher

accuracy

by

using

external

reference

oscillator

which

has

higher

accuracy

than

the

internal

reference

oscillator.

In

this

case,

set

the

IN-OUT

switch

on

the

rear

panel

to

"IN"

and

apply

signals

from

the

external

reference

oscil-

lator

into

the

input-output

connector

of

10

MHz

STD.

CAUTION

Make

sure

to

set

the

IN-OUT

switch

to

“OUT”

except

when

applying

signals

of

the

external

reference

oscillator.

3-5

USE

AS

THE

SECONDARY

FREQUENCY

STANDARD

When

the

In-Qut switch

on

the

rear

panel

is

set

to

"QUT",

the

input-output

connector

of

the

10

MHz STD

provides

signals

of

the

10

MHz

reference

oscillator.

This

signal,

because

of

its

very

high

accuracy,

can

be

used

as

the

external

driving

signal

of

pulse

generators

or

time

markers

for

adjusting

the

oscilloscope.