Racal Instruments 9916 User Manual

Racal Instruments 9916

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I

NTRO

DUCT 10 N

1.1

The

9916

is

an

eight

digit

frequency

counter

with

a measl:Jrement

capability

of

over

520

MHz

and

containing

a

number

of

advanced

operational

features.

The

instrument

operates

from

a.c.

supplies

or

an

optional

internal

battery

pack.

Built in

battery

charging

fa<;:il

ities

are

provided.

1.2

Four

gate

times

of

.01,0.1,

1

and

10

seconds

are

provided.

The

switch

positions

are

marked

with

the

resolution

of

the

display.

A

GATE!CHARGI

NG

lamp

lights

when

measurement

is

in

progress.

An

OVERFLOW!STANDBY

lamp

lights

when

the

display

is

over-filled

or

when

the

instrument

is in

the

Standby

mode.

The

display

and

all

indicator

lamps

are

I.e.d.ls

(light-emitting

diodes).

INPUTS

1.3

Two

input

channels

are

provided.

Input

'B'

is

a

directly

gated,

high

impedance

c

hanne

I for

frequencies

up

to

60

M

Hz

wi

th

a.

g.

c.

Input'

AI

is

a 50 ohm

channel

covering

the

range

40

MHz

to

520

MHz,

prescaled

by

ten

and

with

a.g.c.,

automatic

overload

protection

and

I.e.d.

overload

indicator.

SPECIAL FEATURES

Larae

Scale

Intearation

~

~

1.4

The

heart

of

the

instrument

is

an

integrated

circuit

element

IC4

which

performs

all

the

measuring

functions

of

an

8-digit

60

MHz

counter.

'Burst'

Measurement

1.5

This

facil

ity

is

provided

for

measurements

on

signals

which

occur

in

short

bursts

at

irregular

intervals.

The

minimum

burst

duration

for

the

'A-'

and

'B'

input

channels

is

40

ms

plus

the

gate

time.

Battery

Economy

(Standby)

Facil

ity

1.6

When

the

optional

battery

pack

is

fitted

and

continuous

readout

is

not

required,

a

significant

increase

in

battery

operating

time

can

be

obtained

by

switching

to

STANDBY.

The

instrument

is

then

'off'

except

for

the

internal

frequency

standard.

If

the

RESET

button

is

depressed

the

instrument

will

operate

normally

for

approximately

one

minute,

after

which

it

reverts

to

the

standby

conditions.

This

operation

may

be

repeated

as

required.

1-1

9916

Vol.

2

Table of Contents

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Racal Instruments 9916 Specifications

General

Brand	Racal Instruments
Model	9916
Category	Measuring Instruments
Language	English