BRUEL & KJAER 1623 - Photoelectric Probe M M 001-2

BRUEL & KJAER 1623

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TACHOMETER INPUT:

TRIGGER

LEVEL:

BATTERY:

TRACKING MODE:

BANDWIDTH:

MANUAL

TUNING/PRESET:

TRACKING

FREQUENCY

MULTIPLIER:

RECORDER SYNCHRONISATION:

8

A BNC socket

accepting

either

single

or

double

shielded

BNC

plugs

for

a

tuning

signal

input.

The

inner

shield

is

connected

through

the

On/Off

switch

to

the

built-in

battery

supply

(+

7,5

V)

and is

intended

for

powering

a

photoelectric

pickup (e.g. B & K Type

MM

0012).

Signal

level

20

mV

(noise free)

to

1

20

V peak-to-peak.

Maximum

signal

level

including

DC

offset

42

V

RMS.

Noise

level less

than

20

mV

peak-to-

peak.

Input

impedan

'ce

10

MO.

For

positioning

a

20

mV

wide

amplitude

window,

through

which

the

tuning

signal

is

viewed,

within

the

range

± 1 V. Enables

the

periodicity

of

the

tuning

signal

to

be detected

in

the

most

suitable

portion

of

the

waveform.

Toggle

switch

which

applies

power

to

the

instrument.

The

adjacent

me-

ter

indicates

if

the

instrument

is

powered

(by

the

internal

or

an

exter-

nal

supply) and

if

the

supply

voltage is

sufficiently

high

(blue/green

area)

or

whether

the

supply

voltage is

too

low

or

the

battery

should

be

charged (red area

< 6 V).

Three

pushbuttons

which

select

the

source

of

tuning

signal

for

the

fil-

ter.

Tachm.

Input:

Selects a

signal

applied

to

the

TACHOMETER INPUT

Socket.

Filter

Input:

Selects

the

signal

applied

to

the

FILTER INPUT socket

(rear

panel).

Manual:

Allows

filter

tuning

by

means

of

the

MANUAL

TUNING knob.

Noise

Filter:

Connects

a special

low-pass

noise

filter

into

the

tuning

circuit

to

attenuate

high

frequency

noise

in

the

tuning

signal.

It

be-

comes

automatically

inoperative

for

tuning

signals

above

200Hz.

See

section

4.

7.

Four

pushbuttons

to

select

effective

filter

bandwidths

of

6%,

12%,

23%

("' 1

/3

Octave),

or

Linear.

In

the

linear

position

the

filter

input

is

connected

directly

to

the

output

socket.

With

the

TRACKING

MODE

-

Manual

pushbutton

depressed

the

tun-

ing knob can

manually

tune

the

filter

over

the

frequency

range

2Hz

to

20kHz

in

two

ranges,

2Hz

to

200Hz

and

200Hz

to

20kHz

as se-

lected on

the

adjacent

slide

switch.

Whenever

the

Preset

window

in

the

display

is

illuminated

the

filter

is

tuned

to

the

frequency

deter-

mined

by

the

position

of

the

MANUAL

TUNING/PRESET

knob

multi-

plied

by

the

N/D

ratio

set

on

the

TRACKING FREQUENCY MULTIPLIER.

Four

ten-position

switches

which

multiply

the

tuning

signal

fre-

quency

by

the

ratio

indicated

by

the

upper

(Numerator)

knobs and

lower

(Denominator)

knobs. The

centre

frequency

of

the

filter

is

there-

fore

tuned

to

the

tuning

signal

frequency

x

N/D.

All

ratios

between

1/99

and

99/1

are selectable.

Three

pushbuttons

which

direct

the

filter-to-recorder

synchronisation

circuitry.

These

comments

apply

to

operation

with

the

Portable Level

Related product manuals

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