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Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 2260B Specifications

Bruel & Kjaer 2260 Sound Level Meter
Bruel & Kjaer 2260B Investigator Sound Analyser £ 22 a day *

B&K 2260 Investigator with BZ 7210 Sound Analysis Software



- Conforms with the following:
IEC 60651 (1979) plus Amendment 1 (1993-02) and Amendment 2 (200-10), Type 1
IEC 60804 (2000-10) Type 1
IEC 61672-1 (2002-05) Class 1
DIN 45657 (1997-07)
IEC 61260 (1995-07) plus Amendment 1 (2001-09), Octave and 1/3-octave Bands, Class 0
ANSI S1.4-1983 (R 1997) plus ANSI S1.4A-1985 Amendment
ANSI S1.43-1997 Type 1
ANSI S1.11-1986 (R 1993), Octave and 1/3-octave Bands, Order 3, Type 0-C, Optional Range

Supplied Microphone

Type 4189: Pre-polarized Free-field 1/2". Microphone
Nominal sensitivity: -26 dB ± 1.5 dB re1 1 V/Pa
Capacitance: 14 pF (at 250 Hz)

Input Stage ZC 0026

Extension Cables: Up to 100 m in length between the input stage and the Type 2260 can be driven by the input stage

Measuring Ranges

Linear Operating Range: 80 dB adjustable to give full-scale readings from 80 dB to 130 dB in 10 dB steps
Max. Peak Level: 3 dB above full scale reading
Upper Limit (RMS) for Crest Factor = 10: 17 dB below full scale reading
Passive Attenuation: Microphone attenuator ZF 0023 (included) effectively increases all full-scale readings by 20 dB

Octave And 1/3-octave Band Filters

Octave Band Centre Frequencies: 8 Hz to 16 kHz
1/3-octave Band Centre Frequencies: 6.3 Hz to 20 kHz


Parallel detectors on every measurement:
A-weighted broad-band detector channel with three exponential time weightings (Fast, Slow, Impulse), one linearly averaging detector and one peak detector
C- or L-weighted (switchable) as above for A-weighted
Octave and 1/3-octave band filters, pre-weighted either A, C or L, each with a detector channel containing one linearly averaging detector and one exponentially averaging detector switchable between Slow or Fast
Overload detector which monitors the overload outputs of all the frequency weighted channels

Inherent Noise Level

(Combination of electrical noise and microphone thermal noise at 20 °C). Typical values with supplied microphone of nominal sensitivity:
Weighting2260 Noise       4189 Noise       Combined Noise      
A12.3 dB14.6 dB16.6
C14.0 dB15.3 dB17.7 dB
Lin. 5Hz - 20 kHz         19.2 dB15.3 dB20.7 dB

Correction Filters

Sound Incidence: Built-in filters for correction of frontal/random sound incidence
Windscreens: Built-in filters for correcting the influence of Protective Cover Ua1236, and Windscreens UA 0459 and UA 0237


V = frequency weightings C or L
X = frequency weightings A, C or L
Y = time weightings S, F
N = number
M = set level

For Display and Storage - Broadband : Statistics

Stop DateStop TimeMeasurement No.     
Elapsed TimeNo.of PausesOverload %
Under-range %LApk (MaxP)LVpk (MaxP)
#Peaks A>M#Peaks V>MLAE (ASEL)
LVimLVeq - LAeqLAim - LAeq
Level Distribution       Cumulative Distribution      
Event No. *Event Sample No. * 

For Display and Storage - Spectrum : Statistics

Level Distribution *     Cumulative Distribution *    

Only for Display as Numbers or Bar graphs only - Broadband :

LAS (SPL)LAF (SPL)LAI (SPL)            
LAS (Inst)LAF (Inst)LAI (Inst)
LVS (Inst)LVF (Inst)LVI (Inst)
LApk (peak)     LVpk (Peak)       

For Storage During Logging - Broadband :

Nothing or all parameters or all parameters without statistics or 6 Major Parameters.
LAeq               LCpk (MaxP) ... or LLPk (MaxP) if L is selected    
LAFMaxLCeq ... or LLeq if L is selected

For Storage During Logging - Spectrum :

Nothing or all parameters or all parameters without statistics * or Leq (pre-weighting A, C or L as selected)

Only for Display as Numbers or Spectra (Octave or 1/3-octave Bands)

LXY(SPL)    LXY(Inst)    

Sampling For Statistics

The octave or 1/3-octave Band level Distribution *, Cumulative Distribution * and statistics LXYN1-5 * are based on sampling LXY(Inst.) every 100 ms into 1 dB wide classes over a range of 80 dB
The broad-band Level Distribution, Cumulative Distribution and Statistics LXYN1-5 are based upon sampling LXY(Inst) every 10 ms into 0.2 dB wide classes over 80 dB


: Initial calibration is stored for comparison with later calibrations.
Acoustic: Using the Sound Level Calibrator Type 4231
Electrical (internal): Uses internally generated electrical signal combined with a keyed-in value of microphone sensitivity. Initial calibration is stored for comparison with later calibrations
CIC (Charge Injection Calibration): Injects internally generated electrical signal in parallel with microphone diaphragm.
Reference CIC ratio is stored for comparison with later CIC
A reference CIC is done automatically during External or Internal calibration and stored for later comparison with a new CIC
A manual CIC can be done whenever no measurement is in progress
An automatic CIC can be part of a logging measurement, where the CIC repetition rate can be set to be up to 4 times in a 24 hr. period.
An automatic CIC starts at a 'logical' break in a measurement sequence, shortening the following measurement period by 15 s

Measurement Control

Measurement Types:
Manual - manually controlled single measurement
Automatic - with pre-set measurement time from 1 s to 100 hours in 1 s steps (BZ 7210 only)
Sequence - repetition of a single measurement up to 9999 times (results stored with or without statistical data). Measurement time selectable from 1 s to 100 hours in 1 s steps (BZ 7206 only)
Logging - a single measurement with a selectable duration of 1 s to 100 days in 1 s steps. Logging duration divided into logging intervals of 1 s to 100 hours in 1 s steps
Logging with Events - as Logging, but with the ability to measure a different set of parameters and time base when an event trigger is recognised (BZ 7206 only)
Elapsed Time:
When not in Logging mode, elapsed time resets/starts and pauses/continues according to the respective command. In Logging Mode, elapsed time continues in real-time, regardless of pauses in a measurement

GPS Data

A position can be attached to a measurement job by inputting data from a GPS (Global Positioning System) receiver via the Serial Interface
Receiver Standards Supported: NMEA 0183 ver. 2.20, optional corrected to Differential GPS using RTCM104 ver. 2.1
Baud Rate: 4800 bps


Up to nine independent timers can be specified. Each timer 'wakes-up' the analyser at a specified date and time and initiates a measurement in accordance with pre-defined set-ups. Timed measurement can be repeated up to 999 times. Timers from different software applications can be mixed

Back Erase

Up to the last 15 s of data can be erased.


One data exclusion marker and four user-definable markers for on-line annotation of sound categories heard during the measurement (logging only)
Markers can be edited, while measuring, up to 60 s after the sound is heard (BZ 7206 only)

Control Of Sound Recording

Sound recording (.wav files on a PC using 7815, 7820 or 7825) can be controlled from 2260 via RS-232 interface and Aux output connected to the sound card on a PC
Markers and Events (BZ 7206 only) can be used to control recording on a PC

Measurement Displays

SLM: One main and five secondary parameters can be specified plus one analogue bar with zoom facilities
Cumulative Distribution for one of the octave bands (BZ 7206 only) or 1/3-octave bands (BZ 7206 only) or broad-band plus one analogue bar
Level Distribution for one of the octave bands (BZ 7206 only) or 1/3-octave bands (BZ 7206 only) or broad-band. Class width can be specified. Also with one analogue bar. Zoom facilities provided
Profile: The last 15 s of LAF(Inst) plus one analogue bar for manual or measurement sequence type or the last 60 s with markers for logging measurements
Spectrum: Octave or 1/3-octave band spectrum + two broad-band bars plus one peak bar. Zoom facilities provided.
The four graphical displays also have cursor read-out facilities
CIC: Periodic CICs viewed during or after a measurement

Storage System

Internal Hard Disk: 32Mbyte for application software, user setups and data
External Memory Card for store/recall of measurement data (SRAM or SanDisk ATA Flash Cards)
MS-DOS compatible file system (from ver. 3.3)

Help And User Languages

Concise context-sensitive help throughout in English, German, French, Italian, Spanish, Czech


Back-up battery powered clock. Accuracy better than 1 minute per month


Type: Transflective back-lit LCD 192x128 dot matrix with internal temperature compensation

Input Stage Connection

Connector: 10-pin LEMO

Aux. Outputs (2 Independent)

Can be set to:
LAF(Inst.): 0 to 4 V DC signal updated every 100 ms
Reference: 4 V square-wave for output calibration
Meas. Status for triggering external devices during measurements (including SONY TCD-D7/D8 and TCD-D100 DAT)
Signal from amplified frequency weighted signal (A, C/L)
Event from amplified frequency weighted signal (A, C/L) during events only
Event Status: as Meas. Status, but only during events (BZ 7206 only)
Limited Event Status: as Event Status, but with a maximum specified duration (1 s to 100mins.) (BZ 7206 only)

AC Inputs/Outputs(2)

As Output: Buffered, unweighted microphone signal
Output Impedance: 2 x 200 Ω
Maximum Load: 47 kΩ || 200 pF (Short-circuit protected)
As Normal Input: Alternative to microphone input
As Hand Arm Vibration input: For use with 3-channel Human Vibration Front end Type 1700 - indication of ahw in m/s2 in the Spectrum display
As Whole Body Vibration Input: For use with 3-channel Human Vibration Front-end Type 1700 - indication of awx, awy, awz and av in m/s2 in the Spectrum display
Connector: 3-pin LEMO (balanced input)

Serial Input/Output

Conforms to EIA ITIA 574 (RS 232), coupled as data terminal equipment (DTE)
Connector: 9-pin D-type male
Baud Rates: 1200, 2400, 4800, 9600, 19200, 38400, 115200
Word Length: 8 bits, no parity or stop bits
Handshake: None, XON/XOFF, RTS/CTS

PCMCIA Input/Output

Computer with PCMCIA/JEIDA standards release 1.0.

Settling Time

From Power On: approximately 35 s


Type: 6 x Lr14/C-size 1.5 V alkaline
Lifetime (at 20 °C): 5 to 9 hours continuous

External DC Power Supply

Voltage: regulated or smoothed 10 to 14 V, max. ripple 100 mV
Power: 3.5 W, current: 300 mA, Inrush current: 1000 mA
Socket: Ø5.5mm with Ø2.1mm pin (positive)

Weight And Dimensions

1.2 kg (2.6 lb.) with batteries
375 x 120 x 52mm (14.8 x 4.7 x 2.0 ")
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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