BRUEL & KJAER 1615 User guide

...

Instructions

and

Applications

Octave and

1/3

Octave

Filter Sets 1614 and 1615

The Filter Sets are compact

instruments

plug-in unit

construction. Types

1614

and

1615

filters conform to the IEC

225

and

ANSI Sl. II. standards and cover

the 2 Hz-160 kHz and

Hz-20 kHz

ranges respectively.

"A",

"B",

"C",

"D"

and

"Linear"

networks are

also included. Both the filters and

the networks can be automatically

scanned.

Octave

and

1/3

Octave

Filter

Sets

Types 1614

and

1615

Reprint

may

1970

CONTENTS

1. INTRODUCTION • • • • • • • • • • • • • • • • • . • • • • • . • • • • 3

TECHNICAL

DESCRIPTION • • • • • • • • • • • • • • • • • • • • • 5

Input

Amplifier

. . . . . . . . . . . . . . . . . . . . . . 5

1/3 Octave Filters . . . . . . . . . . . . . • . . . . . . . 5

Octave Filters

.........

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

Effective Bandwidth . . . . . . . . . . . . . . . . . . . 12

Phase

Response

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

Filter Transient

Response

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

Weighting Networks

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

Linear

Ranges

. . . . . . .

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

Output

Amplifier

. . . . .

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

Remote Control . . . . . . . . . . . . . • • • . . . . . . 14

3. CONTROLS

•.•••••..••••.•....•••...••••..

4. OPERATION

••••••.•..•••.•.•.••••••••.•••

General

...................•••.....

Conversion

1615

1614

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

Use

with

Microphone

Amplifier

2603/04

..•.....

Use

with

Amplifier

2606

..........•......

Use

with

Frequency Analyzer 2107

...........

Use

with

Precision Sound Level Meter 2203

and

Impulse Precision Sound Level Meter 2204

..•...

Use

with

Tape Recorder 7001

...........

Use

with

Random Noise Generator 1402

........

Use

with

Level Recorder 2305 • . . . • . • • • • . • . .

TYPICAL

MEASUREMENT

AND

ANALYSIS

SET

-UPS

USING

THE TYPES 1614/15

.....•..........

......

Direct analysis

sound

....

Direct analysis

vibration . . . . . . . . . . . . . . 37

Bands

Random Noise . . . . . . . . . . . . . . .

Analysis

from

Tape Recorder

......

.......

Low

Frequency Analysis

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

. .

Analysis

Transients . . . . . . . . . . . 38

Recording

Low

Frequency Sound

........

. . 39

USEFUL

FILTER

INFORMATION

AND

DEFINITIONS

.....

Ideal

Filter

(Band-pass)

Effective Bandwidth

Octave

Filter

Centre Frequency

.. .. ..

Filter

Band-Edge

Frequencies

Bandwidth

.........

......

. 43

Spectrum . . . . . . . . . . . . . . . . . . . . . . 43

Noise

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

7. SPECIFICATIONS

..........•................

INTRODUCTION

The

Filter Sets Types

1614

and

1615

are a development

the

older design

(Type 1612).

The

filter performance

generally improved and

the

Type

1614

includes extra filters

both low and high frequencies. Both

1614

and

1615

contain

the

sound weighting networks A,

and

the

more recently

introduced D network.

The

Filter Sets are primarily designed for vibration and acoustic frequency

analysis, and have specifications and tolerances which conform

the

following standards:

IEC

225

1966

ANSI S1.11-1966

(1/3octaveCiasslll,

1/1 octave Class II)

DIN

45652

The filters are band-pass filters, with

1/3

octave bandwidths. The filter

centre frequencies are spaced

1/3

octave apart, and filter selection

by a

-position switch

the

front

panel.

the

octave mode, 3 adjacent

1/3

octave filters are connected such as

produce a 1/1 octave bandwidth.

Filter selection

either manual

remote control, enabling synchroniza-

tion

with

other

equipment.

Linear ranges and

the

and D networks are also selected by

the

50-

position switch.

The

input

and

output

the

filters can be connected

a wide range

terminating impedances.

For

Field measurements provision

made for 12 V

operation.

Frequency analysis over a very wide frequency range can be accomplished

with

the

Filter

Set

in conjunction with a 8 & K Sound and Vibration

Measuring amplifier

Type

2606

Type

2603

the

8 & K Sound

Level

Meters.

1/3

octave

1/1 octave bands

random noise may also be

produced by using

the

Filter

Set

in conjunction with

the

8 & K Random

Noise Generator

Type

1402. These and

other

typical uses

the

Filter

Set

are briefly mentioned in Chapter 4

this Manual.

,J::I.

"T1

cp'

tXl

(')

iii'

...,

Input

Bandwidth

1/3

Oct.

1/1

Oct.

Frequency Range

25Hz-20kHz

D-A-8-C-Lin

2Hz-160kHz

Position

Filter

Switch

04 Scanning

Selector

Manuel

2: Remote

Linear

t8Hz-200kHz

•

Off

OJI

·rv~1

~bh

Output

49:

I 2 y

Remote

L__

Co~rol

1'7oo15

TECHNICAL DESCRIPTION

The

block

diagram

Fig.2.1 shows

the

basic design

the

instrument.

The

signal

fed

via an

input

amplifier

the

filter inputs,

which

are

connected

in parallel.

The

input

amplifier has a high

input

impedance, and drives

the

filters

from

a low

output

impedance.

The

filter

outputs

are selected by

the

-position switch. When

the

octave

mode,

the

outputs

three

adjacent

1/3

octave

filters are

connected

together

(via resistors).

The

signal

from

the

filters

fed

two

inputs

buffer

amplifier.

A subsidiary range

filters,

from

kHz

with

C and

Linear filters

can

also

selected. This

also

the

only

frequency

range

the

1615,

which

does

not

possess

the

low

and

high

frequency

filters.

The

position

switch

can

operated

actuating

the

electromagnetic

drive

unit

from

the

remote

control

socket.

The

Filter

set

can

operated

from

normal mains supplies

from a

accumulator, for

which

purpose

there

a DC-

converter.

INPUT AMPLIFIER

The

input

amplifier provides

the

low impedance (rv0.8Q) drive required

for

the

filters.

has an

input

resistance

125

parallel

with

pF,

and

gain

0 dB. Its

frequency

response

flat

from

1.8

Hz-

200kHz

within

±0.1

dB.

1/3 OCTAVE FILTERS

The

1/3

octave filters are all 6-pole

Butterworth

networks

and have

the

centre

frequencies and

bandwidths

given in Table 1.

The

2 -

200

filters are active circuits consisting

3 stagger

tuned

Wien-bridge amplifiers,

with

emitter

follower

output

reduce

the

out-

put

impedance.

The

other

1/3

octave filters are passive networks.

Schematic

diagrams

for

both

active

and

passive

1/3

octave filters are

shown

Fig.2.2

and

2.3

Centre

Frequency Bandwidth Frequency Bandwidth

2 0.46 630 145

2.5 0.58 800 183

3.15 0.73 1000 230

4 0.92 1250 290

5 1.16 1600 370

6.3 1.45 2000 460

8 1.83 2500 580

10 2.30 3150 730

12.5 2.90 4000 920

16 3.70 5000 1160

20 4.60 6300 1450

5.8 8000 1830

31.5 7.3 10000 2300

40 9.2 12500 2900

50 11.6 16000 3700

63 14.5 20000 4600

80 18.3 25000 5800

100

31500 7300

125

40000 9200

160

50000 11600

200 46 63000 14500

250

80000 18300

315

100.000 23000

400

125.000 29000

500

116

160.000 37000

Table

Filter

centre

frequencies and bandwidths.

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