Manufacturers' Specifications
Bruel & Kjaer 4205
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 :
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
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. |
- Gracey and Associates 01933 624212
- BSI approved for the hire of noise and vibration instruments
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B&K Help Line - 01438 739 000