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Bruel & Kjaer 4205 Specifications

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	± 2 dB	± 1.5 dB.	± 2 dB	± 2 dB
50 to 90	± 1.5 dB	± 1 dB.	± 1.5 dB	± 1.5 dB
90 to 95	- 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.

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