Apparecchiature informatiche

Brüel & Kjær 4231 Calibratore
Brüel & Kjær
Modello: 4231
Data: 2011
Categoria: Strumenti di misura
Gruppo: Calibratore
Descrizione: Sound Level Calibrator
❍ Conforms to IEC 942 (1988) Class 1 and ANSI
S1.40–1984 (R 1997)
❍ Robust pocket-size design with highly stable level
and frequency
❍ Calibration accuracy ± 0.2 dB
❍ 94 dB SPL, or 114 dB SPL for calibration in noisy
❍ Extremely small influence of static pressure
❍ Sound pressure independent of microphone
equivalent volume
❍ 1 kHz calibration frequency for correct calibration
level independent of weighting networks
❍ Fits Brüel & Kjær 1′′ and 1 / 2 ′′ microphones ( 1 / 4 ′′ and
1 / 8
 ′′ microphones with adaptor)
❍ Switches off automatically when removed from the

The Sound Level Calibrator Type
4231 is a handy, portable sound source
for calibration of sound level meters
and other sound measurement equip-
ment. The calibrator is very robust and
stable and conforms to IEC 942 Class
1 and ANSI S1.40-1984.
The Sound Level Calibrator Type
4231 is a pocket-sized, battery oper-
ated sound source for quick and di-
rect calibration of sound level meters
and other sound measuring systems.
It fits Brüel & Kjær 1′′ and 1 / 2 ′′ micro-
phones and, with adaptors, it can be
used for 1 / 4 ′′ and 1 / 8 ′′ microphones as
The calibration frequency is
1000 Hz (the reference frequency for
weighting networks), so the same cal-
ibration value is obtained for all
weighting networks (A, B, C, D and
Linear). The calibration pressure of
94 ±0.2 dB re 20 μPa is equal to 1 Pa
or 1 N/m2. The +20 dB level step gives
114 dB SPL which is convenient for
calibration in noisy environments.
The design of the 4231 is based on
a feed-back arrangement to ensure a
highly stable sound pressure level
and ease of use. The feed-back loop
uses a condenser microphone (see
Fig. 1), which is specially developed
for this purpose. This microphone is
optimised to have extremely high sta-
bility and independence of variations
in static pressure and temperature
around the 1 kHz calibration frequen-
cy. The result of this is a user-friendly
calibrator where exact fitting of the
microphone is non critical and the ef-
fects of changes in temperature and
static pressure are negligible.
The calibrator gives a continuous
sound pressure level when fitted on
a microphone (see Fig. 2) and activat-
ed. The sensitivity of the sound meas-
uring equipment can then be
adjusted until it indicates the correct
sound pressure level. The calibrator
is automatically switched off when
removed from the microphone.
A leather protecting case, which
does not need to be removed to use
the calibrator, is supplied.

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

Tipo manuale: Scheda tecnica BruelKJAER-9072-Manual-Page-1-Picture
Pagine: 4
Dimensioni: 624.04 Kbytes (639017 Bytes)
Lingua: Inglese
Manuale-ID/numero: BP 1311-14
Data: 01 settembre 2011
Qualità: Documento elettronico, senza ricerca, molto ben leggibile.
Data di aggiunta:
MD5: 55cba8635dcd5f498b842c633a60cfa8
Downloads: 75 dal 01 giugno 2017

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