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Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 4205 Specifications


Bruel & Kjaer 4205 Reference Sound Power Source
 
B&K 4205 Reference Sound Power Source £ 25 a day *
 

Acoustical


Sound Power Level :


Range : 40 to 100 dB re 1 pW, with overload indication for max. Sound Power Level
Variable in 10 dB attenuator steps.
Continuously variable within each step, potentiometer.

On / Off Control : suppresses the A-weighted Sound Power Level to below 30 dB re 1 pW, 2 position toggle switch

Directional Characteristics :

see manual
 

Sound Power Spectrum

:
Wide Band Noise : 100 Hz to 10 kHz
Octave Band : 125 Hz to 8 kHz in 7 bands
 

Accuracy of Sound Power Level when calibrated


Sound Power Level 125 Hz Octave 250 Hz - 2 kHz Oct. 4 kHz - 8 kHz Oct. Wide Band
40 to 50 dB ± 2 dB ± 1.5 dB. ± 2 dB ± 2 dB
50 to 90 dB ± 1.5 dB ± 1 dB. ± 1.5 dB ± 1.5 dB
90 to 95 dB - 2.5 to + 1.5 dB ± 1 dB. ± 1.5 dB ± 1.5 dB
95 to max. level - 3 to + 1 dB - 1.5 to + 1 dB. - 2 to + 1.5 dB - 2 to + 1.5 dB
 

Electrical
External Filter :

to Input
Signal : Pink noise, 100 Hz to 10 kHz
Output Voltage : 0.7 Vrms ± 0.1 V
Frequency Response : ± 1.5 dB
Output Impedance : < 10 Ω
Minimum Load Impedance : 500 Ω // 2 nF
 

External Filter :

from Output
Input Impedance : 150 kΩ // 1 nF
Input Voltage, FSD : 115 mV RMS
Maximum Input Voltage : 10 V peak
 

White Noise :


Freq. Range : 50 Hz to 10 kHz
Freq. Response : ± 1 dB
Output Voltage : 1 Vrms ± 0.1 V
Output Impedance : < 10 Ω
Minimum Load Impedance : 5 kΩ // 2nF
 

Batteries :

6 x 1.5V D cells
Battery Life : 2 hours at max output black
Battery Life : 10 hours at 80 dB re 1 pW SWL black
 

Generator :

Dimensions and Weight
Height : 132.6 mm
Width : 209.5 mm
Depth : 200 mm
Weight = 3.0 kg
 

Sound Source :

Dimensions and Weight
Height : 345 mm
Diameter : 240 mm
Weight = 3.5 kg
 
E&OE - specifications subject to change without notice.