PRODUCT DATA

Hydrophones � Types 8103, 8104, 8105 and 8106

Brüel & Kjær hydrophones are individually calibratedwaterborne-sound transducers which have a flat fre-quency response and are omnidirectional over a widefrequency range. Their construction is such that theyare absolutely waterproof and have high corrosion re-sistance. All Brüel & Kjær hydrophones are manufac-tured using lead-free nitrile butadiene rubber. There arefour types of hydrophone:� Type 8103 is suitable for high-frequency laboratory

and industrial use and particularly for the acoustic study of marine animals or for cavitation measurements

� Type 8104 is a general purpose hydrophone, also ideal for calibration purposes

� Type 8105 is a robust spherical hydrophone usable down to 1000 m ocean depth with excellent directional characteristics

� Type 8106 has a built-in amplifier which gives a signal suitable for transmission over long cables. It is usable down to 1000 m ocean depth

8103 8104 8105 8106

USES AND FEATURES

USES� Calibration reference standards� Ultrasonic measurements in liquids� Cavitation measurements� Laboratory and industrial measurements in liquids

and gases� As underwater projectors (8103, 8104 and 8105)� Noise measurements in humid and polluted

atmospheres

FEATURES� Frequency ranges from 0.1 Hz to 180 kHz� Individually calibrated� Flat frequency response over wide range� Omnidirectional over wide frequency range� Working pressures up to 9.8 × 106 Pa (100 atm.

[1000 m])� Shielded-element construction

� Highly corrosion resistant

SPECIAL FEATURES TYPE 8103� Very small size (50 × 9.5 mm)� �3 dB limit in air at 15 kHz� Double-shielded, low-noise integral cable

SPECIAL FEATURES TYPE 8105� Omnidirectional over full frequency range� No metallic parts exposed� �3 dB limit in air at 7 kHz

SPECIAL FEATURES TYPE 8106� High sensitivity: �173 dB re 1 V/μPa� Built-in preamplifier with provision for insert-voltage

calibration� Durable construction� Equivalent noise level well below sea-state zero

Introduction

The Brüel & Kjær range of waterborne-sound transducers consists of the following:

Fig. 1 Hydrophone Type 8103

Hydrophone Type 8103A small-size, high-sensitivity transducer for makingabsolute sound measurements over the frequencyrange 0.1 Hz to 180 kHz with a receiving sensitivityof −211 dB re 1 V/μPa. It has a high sensitivityrelative to its size and good all-round characteristics,which make it generally applicable to laboratory,industrial and educational use. Type 8103�s high-frequency response is especially valuable whenmaking acoustic investigations of marine animalsand in the measurement of the pressure-distributionpatterns in ultrasonic-cleaning baths. It is also usefulfor cavitation measurements. Fig.1 indicates the majorfeatures of Type 8103.

Fig. 2 Hydrophone Type 8104

Hydrophone Type 8104A wide-range standard measuring transducer formaking absolute sound measurements over the fre-quency range 0.1 Hz to 120 kHz with a receivingsensitivity of −205 dB re 1 V/μPa. It can also beused as a sound transmitter (projector) which makesit ideal for calibration purposes by the reciprocity,calibrated-projector and comparison methods. Themain features of Type 8104 are shown in Fig. 2.

2

Fig. 3 Hydrophone Type 8105

Hydrophone Type 8105A small, spherical transducer for making absolutesound measurements over the frequency range 0.1 Hzto 160 kHz with a receiving sensitivity of −205 dB re1 V/μPa. It is rugged, being capable of withstandingpressures of up to 107 Pa (100 atm.; 1000 m (3250 ft.)ocean depth). This hydrophone has excellent direc-tional characteristics: at 100 kHz, it is omnidirectionalover 360° in the x-y (radial) plane and 270° in thex-z (axial) plane. Type 8105 is illustrated in Fig. 3.

Fig. 4 Hydrophone Type 8106

Hydrophone Type 8106A wide-range, general-purpose transducer for mak-ing absolute sound measurements over the frequencyrange 7 Hz to 80 kHz with a receiving sensitivity of−173dB re 1 V/μPa. The hydrophone is capable ofwithstanding high static pressure, the operational upperlimit being 107 Pa (100 atm.; 1000 m (3250 ft.) oceandepth). A built-in high-quality, thick-film, low-noise,10 dB preamplifier provides signal conditioning fortransmission over long underwater cables. Thepreamplifier features a 7 Hz high-pass filter and aninsert-voltage calibration facility, but does not allowthe hydrophone to be used as a projector. An inte-grated watertight connector allows quick disconnec-tion of the cable and makes replacement and storagevery easy. Type 8106 is shown in Fig. 4.

3

Construction

The four Brüel & Kjær hydrophones are piezoelectric transducers, that is, they use piezoelectricceramics as sensing elements. The piezoelectric sensing element and its internal supportingstructure are permanently bonded into sound-transparent, lead-free, nitrile butadiene rubber.

The support bodies of Hydrophones Types 8103 and 8104 are made from a 70 � 30 Copper-Nickel alloy. Type 8106�s support body is made of Aluminium-Bronze alloy CuAl10Ni5Fe4(ISO 428). Both alloys have extremely high corrosion resistance to virtually all hostile envi-ronments, and very good anti-fouling properties when immersed in seawater. Type 8105 hasno metal parts exposed.

The internal support is mechanically and electrically isolated from the metal housing, beingcoupled only by synthetic rubber. This provides vibration isolation of the sensing element.Except for Type 8106, the hydrophones are equipped with an integral cable, the shield ofwhich is connected to the internal support/housing, thus providing electrical shielding for thesensing element. Note that Type 8103 has its internal support and metal housing connected atthe plug end of the cable.

Frequency Response and Directivity Patterns

Typical frequency responses of the hydrophones are shown in Fig. 5. These are measured ina water tank in free-field conditions achieved by means of pulse techniques using a PULSE�based calibration system (see Fig. 7).

Fig. 5 Typical receiving frequency characteristics of Hydrophones Types 8103, 8104, 8105 and 8106 (dB re 1 V/μPa)

The hydrophones have very good omnidirectional characteristics. Typical directivity patternsof the hydrophones in water are shown in Fig. 6. These polar directivity patterns were measuredin free-field conditions achieved by means of gating techniques in a water tank. This methodrequires a standard hydrophone as a projector and the unknown hydrophone as the receiverwhose polar directivity pattern is to be determined.

–200

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–2202 5 10 20 50 100 200 500 1 kHz 2 5 10 20 50 100 kHz

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–170

–180

–1902 5 10 20 50 100 200 500 1 kHz 2 5 10 20 50 100 kHz

913452e

Type 8103

Type 8104

Type 8105

Type 8106

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Fig. 6 Typical directivity patterns of Hydrophones Types 8103, 8104, 8105 and 8106

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5

Hydrophone Calibration System

Fig. 7 Hydrophone calibration system: Set-up for calibration in the 4 kHz to 100 kHz range using PULSE Multi-analyzer SystemType 3560. Optional calibration up to 200 kHz is possible using Frequency Doubler WB-3475

Fig. 7 shows a PULSE-based system for calibration of the frequency response of hydrophones.With additional components, the directivity pattern is also included. The system consists of afront-end with generator and input modules, Power Amplifier Type 2713, Turntable Type 3922,Turntable Interface Type 5997, Current Probe WB-1490 and a PC with software and Windows®

operating system. The principle is the well-known gating technique, where a tone burst is sentout from the generator, amplified in the power amplifier and send to the projector (in this casea Hydrophone Type 8104). The signal received from another hydrophone is amplified and thetime signal is shown on the PC monitor. A delay due to the distance between transmitter andreceiver and a gating period depending on frequency range and tank dimensions is set up inthe analyzer in order to analyse on a stable direct signal without transients or reflections. Themeasurements are performed at specified frequencies and a complete calibration chart is printedout. Directivity patterns can be found with software for the turntable. This system can be usedfor reciprocity, comparison and impedance measurements, as well as the projector response.For the receiving response, both magnitude and relative phase can be measured.

Sensitivity Calibration

Each Brüel & Kjær hydrophone is submitted to an extensive ageing and temperature stabilizingprocedure before being individually calibrated. Individual calibration data and frequency responsecurves are supplied with each hydrophone. The receiving sensitivity calibration of the hydrophonesis traceable to international standards (DPLA, NIST, etc.).

A convenient calibration check at low frequencies can be performed using Hydrophone Cal-ibrator Type 4229 (the sensitivity of a hydrophone is the same in air as in water for lowfrequencies). This provides a rapid and easy method for air calibration of sound measuring

Turntable 3922

HydrophoneCalibration

System 9718

060175

Turntable Interface

5997

LAN

IEEE-488

PersonalComputer

Printer

d

Water Tank

Projector8104

Receiver8104

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Emitted Tone Burstc = velocity of sound (in water)

Receiver Signal

Measuring Gate

Measured Received Signal Portion

Currentprobe;Part of

WB-3488

Brüel

B K7/6-'89

& KjærHydrophone Calibration System Type 9718

Keyboard Mouse

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systems terminating in Brüel & Kjær hydrophones. Type 4229 is battery powered and can beused both in the laboratory and in the field.

The principle of operation of Type 4229 is the production of a sound pressure in the couplercavity by four pistons which oscillate back and forth in phase. A frequency of 251.2 Hz isproduced which is electronically maintained within ±0.1%.

Fig. 8 shows sectional drawings of the calibrator. The calibrator couplers are shown fitted withtheir respective hydrophones. The typical sound pressure levels produced in the coupler volumesare 166, 162, 151.5 and 152 dB re 1μPa for Types 8103, 8104, 8105 and 8106, respectively.Note that the sound pressure level in the coupler volume can be monitored with a ½″ micro-phone (see inset of Fig. 8), thus enabling the calibration to be traceable to international standards(DPLA, NIST, etc.).

Note: The coupler for Type 8106, WA-0658, is available separately. The other couplers aresupplied with Type 4229. An Insert Voltage Junction Unit WB-0850 can be used for insertvoltage calibration of Type 8106.

A barometer is supplied with Type 4229 giving the atmospheric pressure correction in dB inthe range 0.65 × 105 to 1.08× 105 Pa (650 to 1080 hPa), that is, �3.85 to +0.55 dB.

Fig. 8 Mounting Hydrophones Types 8103, 8104, 8105 and 8106 in their respective couplers with Calibrator Type 4229. The inset showsa ½″ microphone inserted into a coupler for monitoring the sound pressure level

851504/4

Coupler UA-0548

Coupler UA-0547

Hydrophone 8103

Plug DB-1936

Hydrophone 8104

Coupler WA-0658

Hydrophone 8106

Coupler UA-0546

Hydrophone 8105

Adaptator UA-0903 (Part of UA-0546)

1/2″ Microphone

7

Measurements

Before measurements are taken, the high-impedance output signals from Hydrophones Types8103, 8104 and 8105 should be routed through a signal-conditioning amplifier. Although theinternational standards call for calibration of the hydrophones� voltage sensitivity (using avoltage amplifier), it is often more practical to use a charge amplifier, which will result in acharge sensitivity independent of the actual cable length. Although the entire Brüel & Kjærrange of accelerometer preamplifiers is suitable, Conditioning Amplifier Type 2635, MeasuringAmplifier Type 2525, or one of the NEXUS or PULSE charge input range is recommended.These amplifiers feature sensitivity adjustment to give convenient output values (for example,0.1 or 1 V/Unit) and have a wide frequency range, and adjustable low-pass and high-passfilters. For technical details of these preamplifiers, please refer to their respective product datasheets.

When using Type 8104 or 8105 with Measuring Amplifier Type 2525, BNC to TNC AdaptorJP-0226 must be used. The built-in preamplifier of Hydrophone Type 8106 provides an outputsignal which does not require further conditioning. Type 8106 can be directly plugged intothe preamplifier socket of the Brüel & Kjær range of measuring amplifiers and frequencyanalyzers, with 7-pin Brüel & Kjær sockets, which supply the necessary voltages. Dual Micro-phone Supply Type 5935 must be ordered with modification WH-3125 and requires an externalsupply. Microphone Multiplexer Type 2822 must be ordered with modification WH-3127.

Use as Projectors

Fig. 9 Typical transmitting response to voltage of Types 8103, 8104 and 8105

The piezoelectric effect of the sensing element is re-versible, that is, mechanical excitation causes an elec-trical output, and conversely, an applied alternatingvoltage causes corresponding mechanical excitation.Therefore, Hydrophones Types 8103, 8104 and 8105(but not Hydrophone Type 8106 because it also in-cludes a built-in preamplifier), can be used as soundtransmitters (projectors), for both measurement andreciprocity calibration. Transmitting responses to voltagefor Hydrophones Types 8103, 8104 and 8105 in waterare shown in Fig. 9. Note the 12 dB/octave slope whichis typical for piezoelectric hydrophones driven withconstant voltage input.

When hydrophones are used as projectors, the driving signal requires power amplification.Brüel & Kjær Power Amplifier Type 2713 is especially suited for driving Hydrophones Types8103, 8104 and 8105 as projectors, but is also useful for driving other highly reactive loads.Type 2713 is a low-noise 100 VA power amplifier with a frequency range extending from10 Hz up to 200 kHz, and a gain continuously adjustable between 0 and 60 dB over six 10 dBranges. It also features selectable maximum output voltage limits, as well as extensive protectivefunctions to prevent damage to both the amplifier and the transducer.

5 10 20 50 100 200 50kHz

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81038104

8105dB re 1 μPa/V at 1 m

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Measurements in Air

Hydrophones are particularly useful for measurements under extreme environmental conditionsthat could damage ordinary microphones or affect their performance, such as very high humidityand temperature, or polluted atmospheres.

Hydrophones may also be used for measurement of extremely high sound pressure levels.

Please note that Type 8103 is quite sensitive to acceleration (up to 115 dB/ms�2 when vibratedaxially and up to 128 dB/ms�2 when vibrated perpendicular to the hydrophone axis. As alwaysfor hydrophones the dB reference pressure is 1μPa.

Typical receiving response in air for different hydrophones types are shown in Fig. 10.

Fig. 10 Typical receiving characteristics in air: Types 8103, 8104, 8105 and 8106 in the x-y plane

Cables and Connectors

Special care has been taken in the production of Brüel & Kjær hydrophone cables in order toobtain good electrical shielding. This enables the hydrophones to be used in air and in watertanks where the electrical potential of the water is different from the ground potential, as wellas in cases of high electromagnetic interference.

Miniature Hydrophone Type 8103 is fitted with 6 m integral double-shielded cable terminatedwith a Brüel & Kjær Miniature Plug JP-0056. In cases of high electromagnetic interference, ametal screen can be clamped onto the metal support. This support is connected internally tothe outer shield of the cable which is in turn connected to the inner shield of the terminatingplug end of the cable.

Hydrophones Types 8104 and 8105 have integral 10 m cables (AC-0034) fulfilling MIL-C-915.These are fitted with BNC plugs. For use at greater depths (up to 1000 m with Type 8105),MIL-C-915 standard extension cables of up to 300 m are available to order. These can be fittedto the hydrophone�s integral cable with Brüel & Kjær Waterproof Connectors JP-0415 (male)and JJ-0415 (female). Pictorial assembly instructions are provided with each male or femaleconnector set. We recommend that the male connector (JP-0415) is fitted to the cable on thehydrophone (Fig. 11).

Hydrophone Type 8106 is supplied without a cable. A 10 m Cable AO-0390 (a 10 m lengthof AC-0101) mounted with a watertight Connecting Plug JP-0735 and a Brüel & Kjær 7-pin

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Plug JP-0717 is available for direct connection to the preamplifier socket of older Brüel & Kjærmeasuring amplifiers and frequency analyzers. For connection to PULSE� or NEXUS�, anadditional conversion cable WL-1260 should be used. The Connecting Plug JP-0735 fits the7-pin female connector (corresponding to the Jupiter connector series 10 M) which is anintegrated part of the hydrophone�s bronze support.

For use of Type 8106 at depths greater than 10 m, Hydrophone Cable AC-0101 can be suppliedin continuous lengths of up to 300 m. This cable is a screened, 4-core cable with built-inKevlar® reinforcement. AC-0101 can tolerate high loads � 1300 N in service, with a breakingload of 2600 N. This makes the cable strong enough to be self-supporting for measurementsat ocean depths of 1000 m. Despite the strength of the cables, we recommend the use of someform of strain release for long cables or in cases where there is risk of cable movement.

Fig. 11 Hydrophone Cable Overview

Hydrophone Cable Options with Dry Connector

Type Cable Length Cable Type Connector

8103 6 m LN double screened PTFE 10�32 UNF

8103-V Customer defined LN double screened PTFE 10�32 UNF

8104 10 m LN, MIL-C-915 BNC

8104-V Customer defined LN, MIL-C-915 BNC

8105 10 m LN, MIL-C-915 BNC

8105-V Customer defined LN, MIL-C-915 BNC

8106 NA NA JJ-0738a

a. Cable AO-0390 terminated in JP-0717 (B&K 7-pin plug)

Hydrophone Cable Options with Wet (underwater) Connector

8104-W-001 10 m LN, MIL-C-915 JP-0415

8105-W-001 10 m LN, MIL-C-915 JP-0415

8106 N/A N/A JJ-0738b

b. Cable AO-1433 terminated in JJ-0738

951173/2

10-32 UNF8103

AC-0034AC-0034

AC-0034

AO-1432

AO-1432

AO-0390

ConnectorHydrophone ConnectorCable CableAirWater

Connector

8104 - W-001*

8105 - W-001*

* 10 m

AO-1431

8104 or 8104-V - AC-0034 - x

8105 or 8105-V - AC-0034 - x

8103 or 8103-V - AC-0043 - x

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AO-1433

AC-0101

AC-0034

JP-0735

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BNC8105

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JJ-0415

AC-0101

JP-0415 JJ-0415JP-0415

JJ-0415 JP-0415 JJ-0415

JJ-0738 JP-0735

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JP-0108

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Specifications � Hydrophones Types 8103, 8104, 8105 and 8106

Additional Specifications � Hydrophone Type 8106

MAX. OUTPUT SIGNAL12 V supply: 3.5 V or 28 mA24 V supply: 7.0 V or 28 mA

MAX. POWER OUTPUT50 mW

OUTPUT IMPEDANCE<30Ω

HIGH-PASS FILTER�3 dB at 7 Hz (±2 Hz)

DC RIPPLE REJECTION20 Hz to 20 kHz: 70 dB

OVERLOAD SOUND PRESSURE LEVEL12 V supply: 182 dB re 1μPa24 V supply: 188 dB re 1μPa

Power SupplySUPPLY VOLTAGE12 to 24 V DC

POWER CONSUMPTION6 mA without load

Fig. 12 Typical equivalent noise pressure level of Type 8106

Type 8103 8104 8105 8106

Sensitivitya

a. Nominal value, each hydrophone is supplied with its own calibration data

−211dB re 1 V/μPa ±2dB −205 dB re 1 V/μPa ±2 dB −173 dB re 1 V/μPa ±3 dB

Nominal Voltage Sensitivity 29μV/Pa 56μV/Pa 2.24 mV/Pa

Nominal Charge Sensitivitya 0.1 pC/Pa 0.44 pC/Pa 0.41 pC/Pa N/A

Capacitancea

(incl. standard cable) 3700 pF 7800 pF 7250 pF N/A

Frequency Responsea (re 250 Hz)

0.1 Hz to 20 kHz+1/�1.5 dB

0.1 Hz to 100 kHz+1.5/−6.0 dB

0.1 Hz to 180 kHz+3.5/−12.5 dB

0.1 Hz to 10 kHz±1.5 dB

0.1 Hz to 80 kHz±4.0 dB

0.1 Hz to 120 kHz+4/−12.0 dB

0.1 Hz to 100 kHz+1/−6.5 dB

0.1 Hz to 160 kHz+3.5/−10.0 dB

10 Hz to 10 kHz+0.5/−3.0 dB

7 Hz to 30 kHz+0.5/−6.0 dB

3 Hz to 80 kHz+6/−10.0 dB

Horizontal Directivityb

(radial xy plane)

b. See polar directivity given in Fig. 6Note: Unless otherwise stated, all values are valid at 23°C (73°F)

±2 dB at 100 kHz ±2 dB at 20 kHz

Vertical Directivity(axial xz plane) ±4 dB at 100 kHz ±2 dB at 50 kHz

±2 dBover 270° at 80 kHz±2.5 dB at 100 kHz

±3 dB at 20 kHz

Leakage Resistancea (at 20 °C) >2500 MΩ

Operating Temperature Range:Short-termContinuous

−30°C to +120°C−30°C to +80°C −10°C to +60°C

Sensitivity Change Chargewith Temperature: Voltage

0 to +0.03 dB/°C0 to −0.03 dB/°C

0 to +0.03 dB/°C0 to −0.04 dB/°C

0 to +0.03 dB/°C0 to −0.03 dB/°C

�0 to +0.01 dB/°C

Max. Operating Static Pressure 252 dB = 4 ×106 Pa = 40 atm. = 400 m ocean depth 260 dB = 9.8 × 106 Pa = 100 atm. = 1000 m ocean depth

Sensitivity Change with Static Pressure 0 to �3 ×10�7 dB/Pa (0 to −0.03 dB/atm.) 0 to 1 × 10�7 dB/Pa

0 to 0.01 dB/atm.

Allowable Total Radiation Dose 5 ×107 Rad.

Dimensions: LengthBody dia.

50 mm (1.97″)9.5 mm (0.37″)

120 mm (4.73″)21 mm (0.83″)

93 mm (3.66″)22 mm (0.87″)

182 mm (7.17″)32 mm (1.26″)

Weight(including integral cable) 170 g (0.37 lb.) 1.6 kg (3.5 lb.) 382 g (0.84 lb.)

Integral Cable

6 m waterproof low-noise double-shielded teflon cable with standard

miniature coaxial plug

10 m waterblocked low-noise shielded cable toMIL�C�915 with BNC plug

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Compliance with Standards

Ordering Information

Optional AccessoriesTYPES 8104 AND 8105AO-1431 Extension cable comprising AC-0034, JP-0415 and

JJ-0415AC-0034 Waterblocked low-noise shielded extension cable to

MIL�C�915 available to any length up to 300 mJP-0415 Male underwater connector (for integral cable)JJ-0415 Female underwater connector (for extension cable)JP-0108 BNC connector for extension cable

TYPE 8106AO-1433 Extension cable comprising AC-0101, JP-0735 and

JJ-0738WB-0850 Insert-voltage Junction UnitAC-0101 Watertight, shielded 4-core cable, Kevlar reinforced.

Any length up to 300 mAO-0390 10 m of AC-0101, with JP-0735 and JP-0717JP-0717 7-pin Brüel & Kjær input connector

JP-0744 Male underwater connector for Extension Cable AC-0038JP-0735 Male underwater connector (for extension cable)JJ-0738 Female underwater connector (for underwater

extension cable)

ADAPTORSJP-0145 10�32 UNF to BNCJP-0226 BNC to TNCJP-0162 10�32 UNF to TNCJJ-2617 10�32 UNF to 1/2″ mic. ampWL-1260 7-pin B&K to 7-pin LEMO for connection to PULSE or

NEXUS

GENERALType 4229a Hydrophone CalibratorCables See Fig. 11

, CE-mark indicates compliance with: EMC Directive and Low Voltage Directive.C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand.

Safety EN/IEC 61010�1: Safety requirements for electrical equipment for measurement, control and laboratory use.

EMC Emission

EN/IEC 61000�6�3: Generic emission standard for residential, commercial and light industrial environments.EN/IEC 61000�6�4: Generic emission standard for industrial environments.CISPR 22: Radio disturbance characteristics of information technology equipment. Class B Limits.FCC Rules, Part 15: Complies with the limits for a Class B digital device.

EMC Immunity

EN/IEC61000�6�1: Generic standards � Immunity for residential, commercial and light industrial environments.EN/IEC 61000�6�2: Generic standards � Immunity for industrial environments.EN/IEC 61326: Electrical equipment for measurement, control and laboratory use � EMC requirements.Note 1: The above is only guaranteed using accessories listed in this Product Data sheet.Note 2: Susceptibility when exposed to levels specified in EN 61000�6�2.Conducted RF: <30 mVRadiated RF: <120 mV

TemperatureIEC 60068�2�1 & IEC 60068�2�2: Environmental Testing. Cold and Dry Heat.Operating Temperature: See specificationsStorage Temperature: As for continuous operation, see specifications

Mechanical

Non-operating:IEC 60068�2�6: Vibration: 0.3 mm, 20 m/s2, 10�500 HzIEC 60068�2�27: Shock: 1000 m/s2

IEC60068�2�29: Bump: 3000 bumps at 250 m/s2

Enclosure IEC60529: Protection Provided by Enclosures: IP 68.

a. Type 8106 requires Adaptor WA-0658, available separately

ËBP-0317-

HEADQUARTERS: DK-2850 Nærum · Denmark · Telephone: +45 4580 0500 · Fax: +45 4580 1405www.bksv.com · info@bksv.com

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TRADEMARKSKevlar is a registered trademark of E.I. du Pont de Nemours & Co.Windows is a registered trademark of Microsoft Corporation in the United States and/or other countries

Brüel & Kjær reserves the right to change specifications and accessories without notice