Bruel & Kjaer 8210 Impact Hammer

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The Bruel & Kjaer 8210 Impact Hammer is designed to excite and measure impact forces on medium to very large structures. An accelerometer (or laser velocity transducer) is used to measure the response of the structure. By using an FFT analyzer, such as the PULSE system, the frequency response function and mode shapes of the test structure can then be derived.

The Bruel & Kjaer 8210 has built-in electronics in which the sensitivity is expressed in terms of voltage per unit force (mV/N or mV/lbf). This hammer features a BNC connector at the bottom of the shaft. The Bruel & Kjaer 8210 is supplied with four interchangeable impact tips to control the amplitude and decay of the impact and frequency response. The hammer must never be used without an impact tip. The sensor housing is made of stainless steel and is permanently attached to the hammer.

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Features

Robust construction
1-, 3- and 12-pound versions for a variety of structures
DeltaTron (low-impedance) output
Four impact tips for controlling frequency response and impulse
Supplied in easily transportable carrying case

Specifications

Dynamic Characteristics
Sensitivity (Typical)	0.225 (1) mV/N (mV/lbf)
Full Scale Force Range Compression	22.2 (5000) kN (lbf)
Linear Error at Full Scale	<±2 % full scale
Electric Characteristics
Full Scale Output Voltage	±5 V
DC Output Bias Voltage	+9 to +12 V
Output Impedance	<100 Ω
Power Supply	2 to 20 mA
Voltage Range	+18 to +30 V DC

Applications

Impact-force measurements on medium to very large structures
Measurement of frequency response functions using impact excitation techniques
As part of a dynamic structural testing system for modal analysis and prediction of structural response

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Standards