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Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 2250 Sound Level Meter Specifications


 

This is the main B&K 2250 Specifications page.

To see the specifications for the various options available, click a link

Bruel & Kjaer Sound Level Meter
 
BZ 7222 : Sound Analysis Software
BZ 7223 : Frequency Analysis Software
BZ 7224 : Logging Software
BZ 7225 : Enhanced Logging Option
BZ 7226 : Sound Recording Software
BZ 7227 : Reverberation Time Option
BZ 7228 : Sound Insulation Option
BZ 7230 : FFT Analysis Option
BZ 7231 : Tone Assessment Option
 
B&K 2250 : Home Page
B&K 2250 : Detailed Image
 
Bruel & Kjaer 2250 : Multi-function Sound Level Analyser £ 29 a day*
 

Specifications : 2250 Platform


All our 2250 meters fitted with the supplied microphone and preamplifier and with the instrument at + 20 °C unless otherwise stated

Supplied Microphone


Type 4189: pre-polarized Free-field 1/2" Microphone
Nominal sensitivity: 50 mV/Pa (corresponding to -26 dB re 1 V/Pa) ± 1.5 dB
Capacitance: 14 pF (at 250 Hz)
 

Microphone Preamplifier: ZC 0032


Nominal Preamplifier Attenuation: 0.25 dB
Connector: 10-pin Lemo
Extension Cables: up to 100 m in length between the microphone preamplifier and Type 2250, without degradation of the specifications
 

Microphone Polarisation Voltage


Selectable between 0 V and 200 V
 

Self-generated Noise Level


Typical values at 23 °C for nominal microphone open-circuit sensitivity:
 
Weighting Microphone Electrical Total
A 14.6 dB 12.4 dB 16.6 dB
C 13.4 dB 12.9 dB 16.2 dB
Z   5 Hz - 20 kHz 15.3 dB 18.3 dB 20.1 dB
Z   3 Hz - 20 kHz 15.3 dB 25.5 dB 25.9 dB

Keyboard


Push buttons: 11 keys with back light, optimised for measurement control and screen navigation
 

On-off Button


Function: press 1 s to turn on; press 1 s to enter standby; press for more than 5 s to switch off
 

Status Indicators


Leeds: red, amber and green
 

Display


Type: transflective back-lit colour touch screen 240 x 320 dot matrix
Colour Schemes: five - optimised for different usage scenarios (day, night, etc.)
Back light: adjustable level and on-time
 

User Interface


Measurement Control: using push buttons on keyboard
Setup and Display of Results: using stylus on touch screen or push buttons on keyboard
Lock: keyboard and touch screen can be locked and unlocked
 

USB Interface


USB 1.1 OTG Mini B socket
 

Modem Interface


Hayes compatible GSM or standard analogue modems connected through the Compact Flash slot
 

Compact Flash Socket


For connecting CF memory card, CF modem, CF LAN Interface or CF WLAN Interface
 

Input Socket


Connector: tri-axial LEMO
Input Impedance: ≥ 1 MΩ
Signal Source Impedance < 200 Ω
Direct Input: Max input voltage: ± 14.14 Vpeak,
CCLD Input: Max input voltage: ± 7.07 Vpeak
CCLD Current/Voltage: 4mA/25 V
Note: CCLD = Constant Current Line Drive
 

Trigger Socket


Connector: Triaxial LEMO
Max Input Voltage: ± 20 Vpeak
Input Impedance: > 1 MΩ
 

Output Socket


Connector: Triaxial LEMO
Max Peak Output Level: ± 4.46 V
Output Impedance: 50 Ω
 

Headphone Socket


Connector: 3.5 mm Mini-jack stereo socket
Max Peak Output Level: ± 1.4 V
Output Impedance: 2.2 Ω in each channel
 

Microphone For Commentary


Microphone, which utilises Automatic Gain Control (AGC), is incorporated in underside of instrument.
Used to create voice annotations for attaching to measurements
 

External DC Power Supply Requirements


Used to charge the battery pack in the instrument
Voltage: : 8 - 24 V DC, ripple voltage < 20 mV
Current Requirement: min. 1.5 A
Power Consumption: < 2.5 W, without battery charging.
Cable Connector: LEMO type FFA.00, positive at centre pin
 

Battery Pack


Type: Li-Ion rechargeable
Typical Operating Time: > 8 hours
 

Storage System


Internal Flash-RAM (non-volatile): 20 Mbyte for user setups and measurement data
External Secure Digital Memory Card (SD-card): For store/recall of measurement data
External Compact Flash Memory Card (CF-card): For store/recall of measurement data
 

Clock


Back-up battery powered clock. Drift < 0.5 s per 24 hour period
 

Warm-up Time


From Power Off: < 2 minutes s
From Standby: < 10 seconds for pre polarized microphones
 

Temperature


IEC 60068-2-1 & IEC 60068-2-2: Environmental Testing. Cold and Dry Heat.
Operating Temperature: < 0.5 dB, -10 to + 50 °C (14 to 122 °F)
Storage Temperature: -25 to +70 °C (-13 to 158 °F)
 

Humidity


IEC 60068-2-3: Damp Heat: 90 % RH (non-condensing at 40 °C (104 °F)).
Effect of Humidity: < 0.5 dB for 30 % < RH < 90 % (at 40 °C (104 °F) and 1 kHz)
 

Mechanical


Environmental Protection: Ip44
Non-operating:
IEC 60068-2-6: Vibration: 0.3 mm, 20 m/s2, 10-500 Hz
IEC 60068-2-27: Shock: 1000 m/s2
IEC 60068-2-29: Bump: 1000 bumps at 250 m/s2
 

Weight And Dimensions


650 g (23 oz) including rechargeable battery
300 x 93 x 50 mm (11.8 x 3.7 x 1.9 ")
 
E&OE - specifications subject to change without notice.
* Our standard hire charges are based on a 4-day minimum period, details other options.

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