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Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 2240 Sound Survey Meter Specifications


 
Bruel & Kjaer 2240 Noise Survey Meter
B&K 2240 : Sound Level - Precision Class 1 £ 10 a day *
 

Standards :

- conforms to the following:
  ♦  IEC61672-1:2002 Class 1
  ♦  IEC60651 Type 1 (1979) with amendments 1 and 2
  ♦  IEC60804 Type 1 (2000)
  ♦  ANSIS1.4 - 1983 Type S1
  ♦  ANSIS1.43 - 1997 Type 1
 

Parameters

- Four parameters are measured simultaneously:
  ♦  LAF, instantaneous sound pressure level, frequency weighting 'A' and time weighting 'F'
  ♦  LAFmax, maximum sound pressure level, frequency weighting 'A' and time weighting 'F'
  ♦  LAeq, equivalent continuous sound pressure level, frequency weighting 'A'
  ♦  LCpeak, maximum peak sound pressure level, frequency weighting 'C'
Resolution: 0.1dB for all four parameters
 

Measurement Control

Measurements are manually controlled
Measurement times between 1 s and 60 min
 

Measuring Ranges


RMS: Total range: 30 - 140 dB
Two manually selected ranges: 30 - 110 dB and 60 - 140 dB
Peak: 60 - 143 dB
 

Noise Floor

Below measurement range < 22 dB
 

Detectors


Simultaneous RMS and Peak with independent frequency weightings
Linear Operating Range: 80 dB
 

Frequency Range


20 Hz to 16 kHz
 

Frequency Weightings


A-weighting (RMS)
C-weighting (Peak)
 

Time Weightings


'F' Fast
 

Overload and Under-Range Indicators


Overload is indicated at full-scale +0.3 dB
An overload detected during a timed measurement latches and is displayed with the relevant parameters until these are cleared
Under-range is indicated at scale lower limit -0.5 dB
 

Microphone


Type 4188 Pre-polarized Free-field 1/2" Condenser Microphone Sensitivity: -30 dB re 1 V/Pa ± 2 dB (corresponding to 31.6 mV/Pa)
Frequency Range: 8 Hz to 16 kHz ±2 dB
 

Display


LCD showing:
  ♦  Input signal level – indicated with a quasi-analogue bar
  ♦  Selected parameters with level
  ♦  Warnings for: low battery, measurement in progress, overload and under-range
  ♦  Measuring range
  ♦  Frequency and time weighting
  ♦  Elapsed measurement time
Update Cycle: 1 s (numeric), 0.1 s (bar graph)
Elapsed Time Display: from 00 min 00 s up to 60 min 00 s
 

Settling Time


Less than 5 s
 

Reference Conditions


Reference Frequency: 1000 Hz
Reference Sound Pressure Level: 94 dB
Reference Temperature: 20 °C (68 °F)
Reference RH: 65%
Reference Range: 30-110 dB
Reference Direction of Incidence: Frontal
 

Environmental Effects


Storage Temperature: -25 to 60 °C (-13 to 140 °F)
Operating Temperature: -10 to 50 °C (14 to 122 °F)
Effect of Magnetic Field: 80 A/m (1 oersted) at 50 Hz gives less than 30 dB (A-weighted)
 

Batteries


Two 1.5 V Lr6/AA-size alkaline batteries
Power Consumption During Normal Operation: Less than 300 mW
Lifetime (at room temperature): Approximately 16 hours
 

Physical Characteristics


Dimensions: 230 x 78 x 31 mm including microphone
 

Weight


245 g (8.64 oz) including batteries

E&OE - specifications subject to change without notice.