BRUEL & KJAER 4111 Benutzerhandbuch

4111

INSTRUCTIONS

AND

APPLICATIONS

Condenser

Microphone

Type

4111

Specially

designed

for

measurement

and

calibration

applications,

this

Condenser

Microphone

features

very

high

stabilit

y, a

high

linea

frequency

response

together

with

small

dimension

BHUEL

KJJEK

Naerum,

Denmark

Phone

Naerum

500.

Telegrams:

BRUKJA,

Copenhagen

Beat frequency oscillators

Low frequency oscillators

Deviation

test

bridges

Strain gauge apparatus

Frequency measuring bridges

Distortion measuring bridges

Heterodyne voltmeters

Audio

f~uency

spectrometers

Frequency analyzers

Level

recorders. a. c. and d. c.

Automatic frequency response

recorders

Automatic

spectographs

Logarithmic potentiometers

Noise level potentiometers

Recording paper

Polar diagram recorders

Vacuum tube voltmeters

Wide range vacuum tube

voltmeters

Diode voltmeters

voltmeters

Megohmmeters

~icrophone

amplifiers

Impact sound generators

Acoustic standing

wa.,.

apparatus

Artificial ears

Condenser microphones

Microphone calibration

apparatus

Vibration pick-ups

Integration networks

Rotary selectors

Universal selectors

Freqllency response tracers

Conductivity meters

Electronic counters

Counting

rate

meters

Impulse generators

Portable dose

rate

meters

Portable counting

rate

meters

tubes·& accessories

CONTENTS

Page

Description

Connections

Measurements

Sound

Pres

sure

Level

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

Noise

Measurements

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . • • .

Control

Frequency

Response

and

Sensitivity

Condenser

Microphone

4111................

Calculation

Sensitivity

. . • . . . . . . . . . . . . . . . . • . . . . . . . . . . .

DESCRIPTION

The

Condenser

Microphone

type

4111

particularly

designed

for

mea-

surement

applications

and

has

therefore

very

high

stability

and

com-

paratively

small

dimensions.

built

cartridge

directly

con-

nected

with

cathode

follower

tube,

making

possible

without

any

dif-

ficulty

use

long

cables

between

the

microphone

and

the

following

amplifier.

The

polarization,

anode

and

filament

voltages

the

ca-

thode

follower

and

cartridge

are

all

taken

from

the

amplifier,

which

why

only

Microphone

Amplifier

type

2601

and

Frequency

Analyzer

type

2105

2109

can

used.

Fig.

Photo

Condenser

Microphone

type

4111.

All

the

above

mentioned

apparatus

proviC::.ed

with

special

built-in

rectifier,

hich

delivers

current

for

filament

the

cathode

fol-

wer

in or

der

retain

low

hum

level.

T he

cartridge

mounted

the

end

tube

(diameter

mm,

length

mm),

which

also

contains

the

cathode

follower

with

componeq.ts.

Fig.

shows

exploded

view

the

instrument.

The

other

end

the

tube

tapers

and

continues

self-supporting

goose

neck

with

length

400

mm.

This

terminates

7-pin

plug,

directly

fit-

ting

the

socket

marked

"Condenser

Microphone"

the

amplifier

analyzer.

thus

possible

mount

the

microphone

directly

the

above

mentioned

pieces

apparatus.

bending

the

goose

neck

the

microphone

can

then

placed

any

desired

position.

Fig.

Explodea

view

Condenser

Microphone

type

4111.

The

sensitivity

the

microphone,

about

per

fbar,

compara-

tively

high,

particularly

when

taking

into

acc..ount

its

small

dimens-

ions

and

high

re~onance

frequency.

The

accurate

sensitivity

each

individual

microphone

well

the

total

frequency

response

charac-

teristic

are

shown

recording

the

back

cover,

made

individually

for

each

r."licrophone

delivered.

Fig.

shows

arbitrary

example

such

calibration

curve.

Both

the

sensitivity

(ex,pressed

mV/fbar

(==dynes/

decibels

below

volt/fbar)

and

the

frequency

response

are

valid

for

the

sound

waves

free

sound

field

impinging

normal-

the

microphone

membrane,

with

the

protective

grid

removed.

correction

for

the

influence

this

grid,

which

under

routine

mea-

surements

should

employed

all

cases,

follows

5 ).

The

straight

curve

from

20.

ooo

c/s

the

response

the

cathode

follower

alone

(with

capacity

ooo

across

the

input).

The

factor

the

distance

the

membrane

above

the

edge

the

car-

tridge,

which

necessary

datum

when

checking

the

sensitivity

:neans

the

Electrostatic

Actuator

type

4113

(see

24).

w,_

;

,......_,.

,.......

.,.

IIP4_,.

adlo4e

t.ll

lctl

utr

4te

c.ca4

*···

~~~.::~:f!J;:r

;

;;~yr.:.~

;

.~~

-~;;

POCMt

!.mettor:

l$4!.

DM•

1:6 •

I"·

...

Ief8

Fig.

Example

individual

calibration

curve

for

the

microphone

fitted

with

specified

cartridge

and

with

specified

polarization

voltage.

The

microphone

adjusted

that

its

frequency

response

characte-

ristic

flat

possible

for

zero

angle

incidence.

The

fre-

quency

range

from

c/s

16.ooo

c/s,

which

the

range

c/s

kc/s

linear

within

±2

db.

The

f.i

rst

resonance

fre-

quency

about

kc/s.

When

a m i

crophone

placed

free

sound

f~~ld,

pressure

in-

crease

the

microphone

membrane

got,

co¢pared

with

the

sound

pressure

the

free

travelling

sound

wave,

account

the

scat-

tering

effect

the

microphone

higher

frequencies,

dependent

the

wave

length

the

sound

and

the

dimensions

the

microphone.

This

pressure

increase

for

normally

impinging

sound

waves

given

fig.

order

obtain

flat

response

free

sound

field,

i.e.

constant

electrical

output

the

microphone

versus

fre-

quency,

for

constant

free

field

sound

pressure

prior

the

intro-

duction

the

microphone

the

field,

the

frequency

characteristic

the

microphone

measured

under

constant

pressure

conditions,

where

constant

sound

pressure

applied

the

diaphragm,

must

decrease

for

frequencies

higher

than

Z.ooo

c/s.

-s

-10

0 50

100

200

1000

ell

IOk

Fig.

Pressure

increase

microphone

diaphragm

due

diffraction

around

Condenser

Microphone

type

4111

mounted

free

sound

field

{with

protective

gricJ

removed

and

with

the

sound

mpinging

normally).

The

actuator

measurement

described

page

for

the

determi-

nation

the

frequency

characteristic

simulates

such

constant

pres-

sure

conditions.

Therefore,

that

measuring

procedure

should

employed

for

checking

the

microphone,

fig.4

should

added

alge-

braically

the

resulting

recorded

curve

order

obtain

the

free

field

response

the

microphone.

-----

- - - -- -

J 0

()

0 u

()

u 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c

-f-

·-

db~

--!

- - . -

_-,- _

__:

-10

'b·/

-15 0 50

100

200 500

1000

CIS

2k 5k

10k

15k

'J 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c

Fig.

Corrections

added

the

calibration

curve

fig.

find

the

sensitivity

and

frequency

response

under

free

field

measurements,

degree

(normal)

incidence

with

protective

grid,

free

field

measurements,

90°

(grazing)

inc

ide

nee,

with

protective

grid,

free

field

measurements,

random

incidence,

with

protec-

tive

grid.

The

frequency

response

fig.

was

valid

free

sound

field

with

normally

impinging

sound

and

protective

grid

removed.

Fig.

and

show

three

corrections

which

should

algebraically

added

this

curve

the

corresponding

curve

valid

for

the

microphone

de-

livered,

and

placed

the

back

cover

order

get

the

right

ca-

libration

curve

under

the

following

measuring

procedures:

Free

field

measurements,

degree

incidence

with

protective

grid.

Fig.

indicates

the

diffe

renee

sensitivity

for

the

microphone

with

and

without

grid.

Free

field

measurements,

degrees

incidence

with

protective

grid.

Fig.

indicates

.the

difference

sensitivity

for

the

micro-

phone

with

grid

under

degrees

incidence

and

without

grid

for

nor-

mal

incidence.

Measurements

diffuse

sound

fields

with

random

incidence.

Fig.

indicates

the

difference

sensitivity

for

random

incidence

with

grid,

compared

with

degree

incidence

without

grid.

These

coJ.·rections

are

only

dependent

the

geometrical

form

the

microphone,

and

may

therefore

assumed

constant,

and

used

for

finding

the

corresponding

sensitivity

for

any

microphone

delivered,

for

which

the

free

field

degree

incidence

frequency

response

given.

0 Cl 0 0 0 0 0

0 r l 0

()

0 0 0 0 0 0 0 0 0 U

()

t-1-t--

dbr

-H

- - -

- - I

.:1

I I

t--t

0o 50

100

200 50(1

1000

CIS

u u u 0 0 0 0 0 0 0 0 0 0 0 0 0 2k

0 0

ll..I""""""~.LU,;l--1~

•.

CI,

10k

15k

0 u 0 u 0

()

(I (I

l 1 U

()

Fig.

The

corrections

fig.

performed

the

arbitrary

example

calibration

curve

fig.

The

result

these

three

corrections

carried

out

the

curve

fig.

shown

fig.

where

curve

represents

the

free

field

0°

incidence

sensitivity

function

frequency,

curve

the

free

field

90°

incidence

sensitivity,

curve

the

random

sensitivity.

The

directional

characteristics

(as

recorded

with

the

aid

the

Polar

Diagram

Recorder

type

2370)

Condenser

Microphone

4111

are

given

fig.

for

frequencies

kc/s.

Once

again,

the

geometrical

form

the

microphone

determines

the

shape

these

curves

principal-

ly,

that

they

can

used

for

any

type

4111

microphone.

The

curves

are

taken

with

the

protective

grid

mounted

the

cartridge.

Fig.

rectional

characteristics

Condenser

Microphone

type

4111

with

protective

grid

mounted.

The

sensitivity

mV/fbar

indicated

the

graph

the

back

cover

the

electrical

output

.after

the

cathode

follower

for

free

sound

wave

pressure

level

fbar,

impinging

perpendicularly

the

dia-

phragm.

This

output

results

initially

from

the

voltage

generated

the

cart

ridge,

which

attenuat<::d

two

ways.

First

there

loss

sensitivity

owing

the

input

capacity

the

cathode.

fol-

Inhaltsverzeichnis

Andere BRUEL & KJAER Mikrofon Handbücher

BRUEL & KJAER

BRUEL & KJAER 4117 Benutzerhandbuch

BRUEL & KJAER

BRUEL & KJAER 4964 Leitfaden

BRUEL & KJAER

BRUEL & KJAER 4188 Bedienungsanleitung

BRUEL & KJAER

BRUEL & KJAER 5935 Leitfaden

BRUEL & KJAER

BRUEL & KJAER 4138 Benutzerhandbuch

BRUEL & KJAER

BRUEL & KJAER 4148 Benutzerhandbuch

BRUEL & KJAER

BRUEL & KJAER 4952 Kurzanleitung

BRUEL & KJAER

BRUEL & KJAER 4184-A Leitfaden

Beliebte Mikrofon Handbücher anderer Marken

IK Multimedia

IK Multimedia iRig Stream MIC PRO Bedienungsanleitung

DAPAudio

DAPAudio RM-101 Bedienungsanleitung

AKG

AKG CHM 21 Bedienungsanleitung

Sennheiser

Sennheiser evolution wireless series EM 100 Bedienungsanleitung

Sony

Sony C-48 Bedienungsanleitung

GIGAMEDIA

GIGAMEDIA GGM PAMICUHFG Bedienungsanleitung

Shure

Shure WH30TQG Bedienungsanleitung

auna PRO

auna PRO MIC-900 Bedienungsanleitung

AKG

AKG D 3800 Bedienungsanleitung

Shure

Shure KSM141 Bedienungsanleitung

MAIIN SOUND

MAIIN SOUND IIN style Bedienungsanleitung

Earthworks

Earthworks TC25 Bedienungsanleitung

Sennheiser

Sennheiser evolution D1 Bedienungsanleitung

Alesis

Alesis MicLink Wireless Bedienungsanleitung

DSPPA

DSPPA D6234 Bedienungsanleitung

Monacor

Monacor IMG STAGELINE ECM-300B Bedienungsanleitung

Ansr Audio

Ansr Audio Scan16 Bedienungsanleitung

Shure

Shure MXA710 Series Bedienungsanleitung