Racal Instruments 9916 User Manual

Racal Instruments 9916

86 pages

To Next Page

To Next Page

To Previous Page

To Previous Page

Page #40 background image

Loading...

Page #40 background image

Manual

Reset

4.44

Closing

S50,

the

MANUAL

RESET

push

button,

puts a '0'

on

IC17q!2.

The

resulting

'1'

at

IC17q!12,

inverted

in IC3b

is

applied

to

ICllb/4,

giving

a

'1'

at

IC4/13

and

putting

the

counter

into

the

HOLD

state.

The

:0'

from S50

is

also

applied

to

IC2q!9.

This

gives

a

negative

going

pulse,

of

duration

determined

by

R17ljC71

at

IC2q/12and

IC17q!13.

This

overcomes

any

contact

bounce

effects

in

S50.

4.45

Releasing

55Q

allows

IC4/13

to

revert

to

'Q'

and

a

new

n;Jeasurement

cycle

to

start.

The

'Q'

to

'1'

transition

at

IC3b/4

is

appl

ied

to

1C13q/2,

giving

a

'0'

at

IC2b/l.

This

gives

a

positive

going

pulse

at

IC2b/13which

is

inverted

in

IC3c

to

give

a

negative

9,?ing

pulse

at

IC4/4.

This

unlatches

and

clears

the

stores

ready

for

the

new

measurement.

External Hold

and

Reset

4.46

The

application

of

a

'0'

at

pin

6

of

the

Data

Output

socket

results in a

'1'

at

ICllb/6

and

IC4/13.

Provided

this

is

appl

ied

in

accordance

with

the

conditions

in

paragraph

3.11

the

counter

will

go

into

the

H01

d

state

at

the

end

of

the

measurement

in

progress.

4.47

The

application

of

a

'Q'

at

pin

7

of

the

Data

Output

socket

results in

operation

of

the

reset

circuit

as

described

in

paragraphs

4.44

and

4.45

except

that

no

bounce

protection

is

provided

by

IC2a.

BURST

MODE

Summary

of

Operation

4.48

With

the

FUNCTION

switch

set

to

BURST

the

counter

is

put

into

the

Hold

state.

Pressing

the

RESET

button

extinguishes

the

display

except

for

the

decimal

point.

The

incoming

signal

to

be

measured

causes

the

counter

to

reset

and

commence

a

'one-shot'

measurement

..

As

measurement

commences

the

display

shows

all

zeros.

At

the

end

of

the

measurement

period

the

display

is

updated

and

the

counter

reverts

to

the

Hold

state.

A

fresh

cycle

is

initiated

by

pressing

and

releasing

the

RESET

push

button.

Circuit

Operation

4.49

When

BURST

is

selected

the

Burst

Select

line

is

at

'1'.

ICl7c

therefore

has

all

its inputs

at

'1',

provided

Q26

is

on

(se~

paragraph

4.43).

This

produces

a

'0'

at

ICl7b/5

and

a

'1'

at

IC4/13,

putting

the

counter

into

the

Hold

state.

4-7

9916Vol.2

Table of Contents

Questions and Answers:

Need help?

Do you have a question about the Racal Instruments 9916 and is the answer not in the manual?

Racal Instruments 9916 Specifications

General

Brand	Racal Instruments
Model	9916
Category	Measuring Instruments
Language	English