Attrezzatura informazioni:

Brüel & Kjær 4220 Generatore
Produttore:
Brüel & Kjær
Modello: 4220
Data: 1977
Categoria: Strumenti di misura
Gruppo: Generatore
Descrizione: Pistonphone
Informazioni:
                                    FEATURES:

■	Well defined sound source

■	High calibration level, 124dB SPL at microphone diaphragm

*	Accurate calibration within ± 0,2 dB

■	Transistorized frequency control

*	Individually calibrated

B Battery operated

■	Fits 1", 1/2", 1/4" and 1/8” microphones
USES:

■	Direct calibration of sound measuring equipment

*	Field and laboratory use
The Pistonphone Type 4220 is a small, battery operated, high
level precision sound source, which provides quick and
accurate direct calibration of sound measuring equipment,
tape recordings of sound etc. with an error of less than ±
0,2 dB. It is always ready for use and can be utilized in
the field under severe environmental conditions while still
maintaining high accuracy. It is also extremely useful as a
laboratory standard sound pressure level. The Pistonphone
fulfils the recommendations of the IEC on the calibration of
precision sound level meters. The
calibration frequency, which is 250 Hz with the
self-contained batteries, is controlled within ±1% by means
of a transistor circuit. The piston arrangement, an original
B & K design, consists of two pistons moving in opposite
direction and ensures maximum stability and low non-linear
distortion (see Fig.1).

The operation procedure is simple: Fit the microphone into
the coupler of the Pistonphone and push the control switch
to the "On" position and the Pistonphone will now produce a
constant sound pressure lev-
ei on the diaphragm of the microphone. The Pistonphone can
be held in one hand in any position, while with the free
hand the sensitivity of the sound measuring equipment is
adjusted until a reading corresponding to the sound pressure
level produced is obtained.

The Pistonphone fits the B & K 1 ", 1/2", 1/4" and 1/8"
microphones and microphones having the same standard
diameter, such as the types WE 640 AA, MR 103, etc. Fig.2
shows its use with 1" and 1/2" microphones. The Pistonphone
can also be adapted to other types of microphones by means
of special adaptors. The sound level produced by the
Pistonphone, when fitted to a B & K microphone is 1 24 ± 0,2
dB re 2 x 10-5 Pa. This high level allows correct
calibration to be made even in very noisy surroundings. Each
pistonphone is individually calibrated at normal atmospheric
pressure. A barometer supplied with the Pistonphone gives
the ambient pressure correction in dB, in the range 790 to
1060 mbar.

Questi manuali sono disponibili per l'attrezzatura di cui sopra:

Brüel & Kjær -- 4220 -- Manuale d'uso
Nome file: BruelKJAER-9071-Manual-Page-1-Picture
Tipo manuale: Manuale d'uso
Pagine: 28
Dimensioni: 1.41 Mbytes (1477303 Bytes)
Lingua: Inglese
Revisione:
Manual-ID/Number: 033-0278
Data: 01 aprile 1977
Qualità: Documento scansionato, la lettura in parte male, non in parte leggibile.
Data di caricamento:
MD5: 7eb67206a038789430121a2600f64daa
Download: 54 dal 01 giugno 2017
Informazioni:
1.	INTRODUCTION AND SPECIFICATIONS (PRODUCT DATA)
................................................. 1

2.
OPERATION..............................................................................................
3

2.1.
GENERAL................................................................................................
3

2.2.	BAROMETER UZ 0001 FOR AMBIENT PRESSURE CORRECTIONS
................. 3

2.3.	CORRECTION FOR CAVITY VOLUME
.......................................................... 5

2.4.	USE OF AN EXTERNAL POWER SUPPLY
..................................................... 6

3.	CHARACTERISTICS
..............................................................................................................
8

3.1.	PRINCIPLE OF OPERATION
........................................................................
8

3.2.	PISTONS, NON-LINEAR DISTORTION
......................................................... 10

3.3.	COUPLERS AND ADAPTORS
.....................................................................
1 0

3.4.	MOTOR AND FREQUENCY REGULATOR
..................................................... 11

Control Switch
.........................................................................................
12

3.5.	BATTERIES
..............................................................................................
12

4.	MAINTENANCE
....................................................................................................................
14

4.1.	DISMANTLING THE 4220
..........................................................................
14
BruelKJAER-9071-Manual-Page-1-Picture
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