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Sound and Vibration Instrument Hire and Calibration

Bruel & Kjaer 4447 Specifications


Bruel & Kjaer 4447 Hand-arm Vibration Meter

The B&K 4447 has been withdrawn, the following information is for reference purposes only.

B&K 4447 : Human Vibration Meter - HAVS Assessment £ 24 a day *
 

Complies with the following National and International Standards


BS EN ISO 8041-2005 Technical specification
BS EN ISO 5349-2: 2001 Hand arm
BS ISO 2631-1: 1997 Whole body
BS EN 1032-2003: Mechanical vibration
EU Dir. 2002/44/EC
 

Supplied Accelerometer


Type: 4520-002
Sensitivity: 10 mV/g
Frequency: 2 Hz to 7 kHz
 

Seat Pad Accelerometer

- if included
Type: 4515-B-002 seat pad with type 4524-B triaxial accelerometer
Sensitivity: 100 mV/g
Frequency: 0.25 Hz to 900 Hz
 

Dynamic Range


The useful range of Type 4447 is from 3 mV to approx. 3.4 V (more than 60 dB)
 

Noise


Noise Level: < 3 mV
During high levels of RF airborne emission, noise level may increase
 

Detector


Simultaneous measurement of peak and rms vibration value for each channel
 

Frequency Weighting


Filters for frequency weightings are calculated in the time domain to conform to ISO 8041-2005, including filters Wh, Wd and Wg. Other frequency curves can be added on request
 

Display


Sony Colour graphical display with a resolution of 124 x 124 pixels. Basic information regarding the instrument status is shown through icons, including: battery indicator; measurement status; run; pause; stop; input type; "U" as direct or voltage input or "OK" as DeltaTron input: Overload (OVL) or Short (SHT) circuit and real time or elapsed time.
 

Measuring Parameters


Measured parameters are selected according to the selected setup mode. The following parameters are measured and calculated during measurement: Time Averaged Weighted Acceleration Value (TAWAV); Maximum Transient Vibration (MTVV); Vibration Dose Value (VDV); Motion Sickness Vibration Dose (MSDV); running rms acceleration value
 

Shock Limits


Max. Shock: 5000 g
Higher shock values can be obtained by the use of dedicated shock accelerometers
 

Memory


64 KB or 750 measurements can be stored in non-volatile memory
 

USB Interface


Conforms to USB 2.0
Connector: Mini B
 

Clock


Real-time clock with calendar
 

Calibration


Reference Vibration Value: 10 m/s
Reference Frequency: 159.2 Hz
Reference Electrical Level: 100 mV for 4515-B-002 and 10 mV for 4520
 

Battery


Rechargeable Li-ion battery 3.7V, 2400mA. More than 3.5h continuous use at room temperature

Caution - the internal re-chargeable batteries only last 3 hours a day. If mains is available locally, this is not a problem.

Physical Dimensions


Size: 70 x 135 x 28 mm ( 2.7 x 5.3 x 1.1" )
Weight: 260 g ( 9.2 oz ) battery included
 
See also our main Hand Arm Vibration White Finger and Whole Body Vibration web page
 
E&OE - specifications subject to change without notice.