Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 2240 Sound Survey Meter Specifications

B&K 2240 : Sound Level - Precision Class 1	£ 10 a day *

Standards :

- conforms to the following:
IEC 61672-1:2002 Class 1
IEC 60651 Type 1 (1979) with amendments 1 and 2
IEC 60804 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.
* Our standard hire charges are based on a 4-day minimum period, details other options.