Racal Instruments 9916 - Page 81

Racal Instruments 9916

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.

Frequ~ncy

Meters

-

Normal

Use

12.

(1)

Check

the

following

pin

connections

on

the

50

way

connector:-

Pin

No.

Requi

red

Connecti

on

19

and

24

49

Open

Ci rcui

t,

or

connected

to

OV

Connected

to

the

Hold

signal

(2)

The

Hold signal

(logic

level

11'

to

hold)

should

be

applied

to

the

interface

after

receiving

the Print Command

signal,

but

before

the

end

of

the

next

gate

time

(ie

7

ms

for 10

ms

gate

time),

and

should

remain

at

logic

level

'1'

for

the

period

that

the

_

information

on

the

data

output

is

required

to

remain

unchanged.

Although

the

outputs

from

the

interface

will remain

unchangedwhilst

a

Hold

is

applied,

the

counter

continues

its

normal

measurement

sequence,

i.e.

'free

run',

This has

the

advantage

that

the

next

Print

Command

will be

given

at

the

end

of

the

gate

time

immediately

following

the

release

of

the

Print

Hold.

This

result

in a more

rapid

measurement

sequence.

From

Fig.

A2.

it

can

be

seen

..Jt

a Print Command signal

occurs

3 to 4

ms

after

an

end

of

gate,

by

which

time

the

gate

rime for a

new

measurement

will

have

commenced.

NEW

GATE

TIME

I

I

I

I

I

'm,

1'--_____

j

I I

I I

I I

I 1

I I

____

IO~~'5L

1

I \

I I

I

~

I

I I

1

HOLD

MUST

BE

APPLIED

I

I--

DURING

THIS

TIME

TO

STOP

-..,

. I DATA CHANGING

AT

END OF

NEXT

I

GATE

TIME

END

OF

GATE

_/

- REQUIRED

~

MEASUREMENT

l'

m s

I

I

I

I

I

I

DATA

UPDATE

PRINT

COMMAND

Fig.A2

-:;~ction

4 : 99

Series

Appendix

1.

Page

App

4

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