BRUEL & KJAER 2972 User guide

Gate

Deltlv

Tape Signal Gate

Type 2972

A mains operated instrument

for

the

elimination

tape

splice

noise

other

unwanted signals on

pre-recorded

tape

loops

. Although

primarily

intended

for

use with

multi-track

tape recorders it may

also be used with

digital

recorders.

For

the analysis of recorded

signals it

will

be found

especially

useful

for

ensuring

that

only the

desired part of the signal is

analyzed.

TAPE

SIGNAL

GATE

TYPE 2972

November 1972

CONTENTS

INTRODUCTION

.....................

...........................

........

.....

CONTROLS

......

............. .............. .. ...... ........ .... .. .. .. ......... ... . 6

2.1.

Front

Panel ........................................................... 6

2.2. Rear Panel

.. ....

.........

...

.......

..................

.....

......

OPERATION

.............................................................

....

.....

3.1.

Preliminary

............................................................ 12

Mounting

.............................................................. 12

Mains

Voltage

Selection

......................................... 12

3.2

Operation

With

Tape Recorder .

..........

....

......

.......

Use

with

the

8 & K FM Tape Recorder Type

7001

.. ..

. 13

Use

with

other

types

Tape Recorders .................... 19

3.3.

Operation

With

Digital

Recorder ...... ... ... .

......

....

.....

Use

with

the

8 & K

Digital

Event

Recorder Type

7501

3.4.

Uses

Auxiliary

Output

......

.....

........

Remote

Reset

facility

.................. .... ...... .... ...

...........

TIL

Gate

Pulses .....

...................

..... ..............

........

OPERATING

CHARARACTERISTICS

..............

..................

Triggering

.. .

....

.....

...

............

... ....

.............

4.2.

Gate

Delay

... .. ......

.....

.......

........

.. ..........

.....

.......

4.3.

Gate

Width

....... .

.........

....

...... ... .......

.. ...........

4.4

Signal

Gate

...... ........ ................. ..

.....

...

.........

.......

4.5.

Power

Supply

.....

...

... .

...

....

......

........

.. .......

4.6.

Effect

Gating

............

... ....... .....

..........

.....

...... ..

FREQUENCY

ANALYSIS

...............................................

.....

5.1 .

Impulse

Analysis

............

.....

...............................

5.2

Spectrum

Strobing

...

.. ...........

......... .

...........

.....

. 41

SHORT

TAPE

LOOP

ADAPTOR

TYPE

0030

.......

........

...

6.1.

Fitting

the

Short

Tape Loop AdaP,tor ....

.......

.....

......

.. .

6.2.

Fitting

Automatic

Speed

Sensing

Off

Switch

..... 47

SPECIFICATIONS

......................................................

...

......

INTRODUCTION

The

Tape

Signal

Gate

Type

2972

a mains

operated

instrument

for

the

elimination

tape

splice noise

other

unwanted

signals

prerecorded

tape

loops.

Although

primarily

intended

for

use

multitrack

tape

recorders

such

the

B & K

Type

7001 it

may

also

used

with

digital

recorders.

For

frequency

analysis

recorded

signals it will be

found

essential

for

ensuring

that

only

the

desired

part

the

signal

analyzed.

The

2972

has a

frequency

response

from

40kHz

and

dynamic

range

dB.

capable

gating

a signal so

that

only

the

part

interest

passed

its

output,

whilst

unwanted

signals

noise

are

rejected

than

dB.

The

length

the

signal passed

the

output

(gate

window)

as well as its relative

position

relation

the

rest

the

signal

may

adjusted

from

0.1 msec.

sec. using

the

GATE

WIDTH and

GATE

DELAY

controls

provided.

accurately

set

the

position

the

gate

window,

the

2972

has

two

trigger

modes

whereby

may

triggered

from

a sinusoidal signal

burst

recorded

tape

loop

TTL

pulse

from

digital

recorder.

For

monitoring

the

output

the

2972

order

see

that

the

correct

part

the

recorded

signal

gated,

separate

output

available

for

triggering an oscilloscope.

2.1.

FRONT

PANEL

Power

Switch-+-___,.

Gate

Delay

Equalizer

Trigger

Input

___

2. CONTROLS

Trigger

Mode

Gate

width

Signal

~---"'---+-Displacement

Gate

'--------Output

Fig.2.1.

Front

panel

the 2912.

POWER SWITCH:

POWER

INDICATOR:

GATE

DELAY:

On/Off

switch

for

the

internal

connection

a mains supply connected

at the POWER

INPUT

socket.

opal

indicator

lamp

which

lights

when

the

instrument

connected

mains supply and

the

POWER

SWITCH

set

"On".

Two

controls, one switched

(outer

knob),

the

other

continuously

variable

(inner knob)

providing

gate delays

(time

taken

for

gate

triggered

after

external trigger signal

has

been applied

EQUALIZER:

SIGNAL

INPUT:

TRIGGER

INPUT:

TRIGGER

MODE:

the

TRIGGER

INPUT

socket)

0. 1 msec.

30 seconds.

The

inner

control

provides

continuous

adjustment

the

gate delay over

the

delay range selected using the

outer

control.

Potentiometer

control

for

adjustment

the

DC level

the

gated signal (outside

gate

window,

only)

available at

the

GATE

OUTPUT

socket.

The

range

adjustment

± 2 V referred

0 V

chassis level.

Coaxial

input

socket accepting

the

B & K plug

0101

for

application

the signal

gated.

The

socket

connected

the

BNC

SIGNAL

INPUT

socket

the

rear panel

the

instrument

and

has

input

impedance

in parallel

with

pF.

The

maximum

input

voltage

2 V peak.

Coaxial

input

socket

for

application

external trigger signal

(burst

pulse

depending on setting

TRIGGER

MODE

switch)

trigger the gate.

The

trigger signal

delayed

internally

for

the

time

selected using

the

GATE

DELAY

controls.

The

TRIGGER

INPUT

has

input

impedance

approximately

and

accepts

the

B & K plug

0101.

Two

position

switch

with

the

following

functions:

"Burst".

With

this

mode

selected a

sinusoidal signal

burst

with

amplitude

0.3

10 V and length greater than

30 msec.

may

applied

the

GATE

WIDTH:

SIGNAL

DISPLACEMENT:

GATE

MODE:

TRIGGER

INPUT

socket

trigger the

gate.

"Pulse".

this

mode a

TTL

(transistor-

transistor logic)

compatible

pulse (i.e. 0

0.5 V

for

logical

and 2.5

5 V

for

logical

with

length greater than

20 psec. may be applied

the

TRIGGER

INPUT

socket

trigger the

gate.

Two

controls, one switched

(outer

knob),

the

other

continuously

variable

(inner knob) providing gate

widths

(period

for

which

gate

open when

the

GATE

MODE

switch

set

"Normal"

period

for

which

gate

closed when

the

GATE

MODE

switch

set

"Inverted")

0.1 msec.

seconds.

The inner

control

provides

continuous

adjustment

the gate

width

over the

gate

width

range selected using the

outer

contro

Potentiometer

control

for

adjustment

the DC level

the gated signal

(within

gate

window

only)

available at

the

GATE

UTPUT

socket.

The

range

adjustment

±2 V referred

0 V

chassis

level.

Two

position

switch governing the gate

mode.

The

modes

are

"Normal"".

this

mode

the

gate

open

for

the

period

selected using the

GATE

WIDTH

controls

i.e.

the

signal applied

the

GATE

INPUT

socket during

this

period

passed

the

GATE

OUTPUT

socket.

During

the

period

immediately

before and

after

the gate

opened

the

input

signal

blocked.

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