HP 5355A - Page 24

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Model

5355A

Operation

and

Programming

INDICATORS

REMOTE.

Indicator

illuminates

when

5355A

is

under

remote

operation

and

all

front

panel

controls

are

inoperative

except

the

LOCAL

key

(unless

Local

Lockout

command

has

been

sent).

LISTENING.

Indicator

illuminates

when

5355A

is

addressed

and

monitoring

the

interface

bus.

SIGNAL.

Indicator

illuminates

when

input

signal

is

of

sufficient

level

to

be

counted.

KEY

INDICATORS.

Indicator

within

a

key

illuminates

when

the

key

is

pressed

to

initiate

the

key

function.

Pressing

the

key

again

releases

the

function

and

the

indicator

extinguishes

(except

for

the

CW

and

PULSE

keys).

CONTROLS

All

front

panel

controls

are

pushbutton

keys

with

center

indicators

that

indicate

the

oper¬

ating

function

of

the

plug-in.

The

keys

are

grouped

under

two

general

functional

headings,

DATA

ENTRY

and

MEASUREMENT,

as

described

below.

The

two

color-coded

DATA

ENTRY

keys

on

the

left

side

of

the

front

panel

are

used

to

enter

data

for

a

manual

center

frequency

or

an

offset

frequency.

When

one

of

these

keys

is

enabled

(key

indicator

illuminated)

the

functions

of

the

MEASUREMENTS

keys

to

the

right

are

defined

by

the

label

whose

color

corresponds

to

that

of

the

enabled

DATA

ENTRY

key.

Figure

3-1.

Front

Panel

Controls,

Connectors

and

Indicators

DATA

ENTRY

Keys

3-2

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