Manufacturers' Specifications

Bruel & Kjaer 3595

Matched Sound Intensity Microphone Pairs

Sound intensity free-field frequency ranges - 1/3-octave with 1/2" microphones Type 4197 connected to Dual Preamplifier Type 2683 (IEC 1043 Class 1): using the three standard spacers

8.5 mm spacer: 250 Hz to 6.3 kHz - pressure-residual index > 15.3 dB
12 mm spacer: 250 Hz to 5.0 kHz - pressure-residual index > 16.8 dB
50 mm spacer: 20 Hz to 1.25 kHz - pressure-residual index > 23 dB above 250 Hz)

Dimensions
Length of Extension Stem: 42 cm (16.5 in)
Width: 43 mm (1.7 in)

Weight:
Including. handle: 0.35 kg (0.77 lb)
In case: 6.50 kg (14.3 lb)

Sound Intensity Microphone Pair 4197 - Specifications

Type	4197
Diameter	1/2"
Polarization Voltage (V)	200
Open-circuit sensitivity mV/Pa	11.2 *
Open-circuit sensitivity dB re 1 V/Pa	-39
Free-field frequency response ±1 dB	5 Hz to 12.5 kHz *
Free-field frequency response ±2 dB	0.3 Hz to 20 kHz
Resonant frequency	34 kHz
Lower limiting frequency -3 dB	0.14 Hz
Vent sensitivity re diaphragm sensitivity at 20 Hz	<-64 dB * (-18 dB/octave)
Polarization cartridge capacitance at 250 Hz	19.5 pF *
Cartridge thermal noise	20.0 dB(A)
Upper limit of dynamic range, Distribution <3 %, 100 Hz	162 dB SPL
Temperature coefficient -10 °C to +50 °C, 250 Hz	-0.002 dB/°C
Ambient pressure coefficient at 250 Hz	-0.0007 dB/hPa
Humidity coefficient 100% RH	<0.1 dB
Vibration sensitivity at 1 m/s²	65.5 dB SPL
Magnetic field sensitivity 50 Hz, 80 A/m	6 to 34 dB SPL
Thread for preamplifier mounting	5.7 - 60 UNS
Accessories included	UC 5349 - 8.5 mm spacer UC 5296 - 12 mm spacer UC 5270 - 50 mm spacer

* individually calibrated

Microphone Matching - Specifications

Type	4197
Phase response difference - absolute value	<0.05 ° : 20 Hz to 250 Hz *
Phase response difference - 1/3-octave centre frequencies	<f [Hz]° / 5000 : 250 Hz to 6.3 kHz *
Amplitude response difference, normalized at 200 Hz	<0.2 dB: 20 Hz to 1 kHz
Amplitude response difference, normalized at 200 Hz	<0.4 dB: 20 Hz to 7.1 kHz
Sensitivity difference at 250 Hz	<1 dB
Polarization capacity difference	<1.0 pF

* individually calibrated

Dual Preamplifier 2683 - Specifications

Phase Matching	<0.015° at 50 Hz (20 pF microphone capacitance f [kHz] x 0.06° : 250 Hz to 10 kHz
Electrical noise re microphone sensitivity ** 1/4" 6.4 pF dummy	39.2 dB SPL (A)
Electrical noise re microphone sensitivity ** 1/2" 19.5 pF dummy	19.4 dB SPL (A)
Input impedance	>15 GΩllxx pF ***
Attenuation for 1/2" microphones	Ch. A = 0.6 dB; Ch. B = 0.3 dB
Attenuation for 1/4" microphones	Ch. A = 1.7 dB; Ch. B = 0.7 dB

** This corresponds to a total (microphone + preamplifier noise floor of 39.3 dB SPL (A) and 22.7 dB SPL (A) respectively.

*** xx is typically 1.1 pF for Ch. A and 0.4 pF for Ch. B

Note:
All values are typical at 25 °C (77 °F), unless measurement uncertainty is specified.
All uncertainty values are specified at 2ó (i.e., expanded uncertainty using a coverage factor of 2)

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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Manufacturers' Specifications Bruel & Kjaer 3595

Manufacturers' Specifications

Bruel & Kjaer 3595