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BRUEL & KJAER
Measuring Instruments
4220
BRUEL & KJAER 4220 User Manual
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Pistonphone
Type
4220
The
Pistonphone
is
a
compact
battery-operated
precision
sound
source,
designed
to
enable
quick
and
accurate
overall
calibration
of
sound
measur-
i
ng
equ
i
pments.
It
produces
a
sound
pressure
level
of
124
dB
at
the
microphone
diaphragm,
at
a
frequency
of
250
Hz
.
--
1
BRUEL&K.'-'AEA
NA:.RUM,
DENMARK.
Teleph
.:
80
OS
00.
Cable
:
BRUKJA
.
Telex
:
5316.
COPENHAGEN
BB
4220-
0300053
2
Table of Contents
Table of Contents
4
Introduction
5
Description
8
General
8
Principle of Operalion
9
Pistons, Non-Linear Distortion
10
Coupler and Adaptors
11
Motor and Frequency Regulation
13
Batteries
14
Barometer. Ambient Pressure Correction
15
Operation
16
General
16
Ambient Pressure and Volume Corrections
17
Use of External DC Power Supply
18
Pistonphone's Dismantling
19
Applications
20
Calibration Checks on B & K Sound Measuring Equipment
20
Level Calibration of Tape Recordings
23
Specifications
24
Part Numben
25
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BRUEL & KJAER 4220 Specifications
General
Brand
BRUEL & KJAER
Model
4220
Category
Measuring Instruments
Language
English
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