Iwatsu SC7101 - Measurement; Frequency Measurement

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Section

3

Measuring

Procedures

3-3.

MEASUREMENT

3-3-1

Frequency

Measurement

Internal

Self-check

With

turning

on

the

power

switch,

after

perform

ing

"power

on

self-check",

measuring

the

10

MHz

of

the

internal

reference

oscillator

with

TIME

BASE

1

s,

displays

"10.000

000

6

Hz".

Then,

the

display

is

changed

by

TIME

BASE

as

listed

in

Table

3-3-1.

Table

3-3-1.

TIME

BASE

Count

display Display

unit

Mantissa

1

ms

10.000

Hz

10

ms

10.0000

Hz

O1s

10.00000

Hz

1s

10.000000

Hz

10s

10.0000000)

Hz

<Note>

1

ms

of

TIME

BASE,

available

for

the

SC-7102

only.

Measurement

Procedure

*

Press

the

[CHECK]

key

and set

to

the

"MEASURE"

mode.

(LED

turns

out).

Operate

ATTEN

and

FILT

switches.

Connect

the

signals

to be

measure:d

to

the

input

connector.

Connect

the

signals

to

be

measured

to

the

input

connector

selected

with

the

INPUT

SELECT

key.

Select

the

most

suitable

TIME

BASE.

In

case

of

holding

the

measured

results,

press

the

key.

Then

the

LED

located

above

the

key

turns

on

and

holds

the

results.

.

SC-7101

/SC-7102

Reference

for

Frequency

Measurement

When

the

signals

to be

measured

are

higher

than

10

MHz;

The

measuring

gate

opens

for

the

time

selected

as

the

TIME

BASE,

and

counts

and

displays

frequencies

of

input

signals

during

this

period.

When

signals

to

be

measured

are

lower

than

10

MHz;

Measure

by

the

RECIPROCAL

method.

REFERENCE

RECIPROCAL

Method

.

The

reference

gate

opens

for

the

time

selected

as

the

TIME

BASE,

then

the

measuring

gate

opens

in

triggering

the

input

signals,

After

closing

of

the

reference

gate,

the

measuring

gate

closes

triggering

with

the

input

signals.

The

instrument,

counting

the

measuring

gate

open

term

“t”

with

the

reference

clock

(10

MHz)

also

counts

a

number

of

period

“n”

of

the

signals

to

be

measured

within

this

term

and

obtains

the

frequency

by

executing

calculation

of

f

=

n/t

and

displays

the

result.

(reciprocal

of

the

average

period

measurement).

When

this

method

is

used,

irrespective

of

the

input

frequency,

resolution

of

the

results

is

determined

by

the

measuring

time

(displays

7

digits

for

1s

gate,

normally).