Iwatsu SC7101 - DISPLAY UNIT Sescsscseccccccccscscseces

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SC-7101

/SC-7102

2-3.

DISPLAY

UNIT

Section

2

Operating

Information

11

digits

LED

to

shows

measured

results

of

input

signals.

Turns

on

while

GP-IB

remote

status.

Turns

on

while

the

|

measurement

overflows.

Gate

Turns

on

while

the

=

4

oogc000

Indicates

the

high

stability

crystal

oscillator

with

a

thermostat

(SC-7102)

a

ETS

EI

TTT

>

oven

6

z

EXPONENT

gate

is

open.

Display

of

Hysteresis

in

a

Mantissa

In

measurement

of

the

signal

of 10

MHz

or

less,

resolution

is

determined

according

to

the

mea-

surement

time.

Thus,

if

MSD

value

of

the

mea-

sured

results

changes

from

9

to 10

or

vice

versa,

read-out

of

the

results

becomes

difficult,

since

the

position

of

decimal

point

and

exponent

change

while

the

number

of

digit

displayed

remains

same.

To

solve

this

problem,

when

MSD

value

changes

from

9

to

10,

the

display

of

the

mantissa

is

shifted

to

left

by

1

digit

to

blank

the

lowest

digit.

(For

the

external

output

data,

0

is

added

to

the

lowest

digit).

When

MSD

value

changes

from

10

to

9,

the

display

of

the

mantissa

is

shifted

to

right

by

omitting

1

digit.

Through

the

above

operations,

hysteresis

is

provided

with

display

for

easy

read-out.

If

this

operations

are

performed

8

times

continu-

outly

or

if

the

MSD

value

becomes

any

one

of

2

through

8,

results

will

be

displayed

without

such

operations.

In

the

RECIPROCAL

mode

measurement,

where

the

result

is

obtained

by

calculating

the

count

data,

there

may

be

1

digit

difference

in

the

effective

digit

due

to

calculated

error

even

in

measurement

in

the

same

range.

Also,

in

such

a

case,

the

same

processes

as

above

are

performed

to

ensure

easy

read-out.

—

Mantissa

Exponent

On

Displays

*

The

highest

9

digits

indicate

the

mantissa.

However,

in

the

case

when

the

measured

result

is

negative,

the

first

digit

(the

left-end

of

the

mantissa

display)

takes

"-"

sign

and

the

display

of

the

measured

result

is

maximum

8

digits.

*

The

lowest

two

digits

(10th

and

11th

digits

from

the

left)

display

the

sign

of

the

exponent

and

1

digit

of

the

exponent.

The

displays

of

the

exponent

are

by

such

multi-

ples

of

3,

as,

-9, -6,

-3,

0,

3, 6,

9.

When

the

sign

of

the

exponent

is

+,

this

position

is

left

blank.

*

For

display

of

the

mantissa,

the

leading

zero

blanking

occurs.

°

When

the

measurement

overflows,

normally

the

OVER

LED and

the

date

display

indicates

overflow

mark

"Uuueee".

However,

though

counting

has

been

10

or

more

digits,

the

data

display

shows

the

mantissa

in

9

digits

from

the

lowest

digits

and

indicates

the

overflow

by

turning

on

the

OVER

LED.