Bruel & Kjaer Type 4447 Human Vibration Analyzer
Description
An easy-to-use, rugged and portable human vibration analyzer, designed primarily for Health and Safety at Work applications, specifically risk assessment according to EU Directive 2002/44/EC. It measures exposure to hand-arm and whole-body vibration, and complies with the technical requirements of ISO 8041:2005. Type 4447 measures and displays all relevant parameters in X, Y and Z direction, and logs RMS, MTVV, VDV and peak values with a 1 second interval. Data can be reviewed on the instrument, and it also comes with Vibration Explorer PC software for data archiving on a PC and calculation of vibration exposure.
Features
- Triaxial, single-axis and 3+1 measurements
- EU Directive parameters measured and displayed
- RMS, MTVV, VDV (WB only) and peak values logged with 1 s interval (logging capacity > 4 hours)
- Rechargeable Li-Ion battery
- USB connector for data transfer to PC, software maintenance and battery charging
- Included PC software, Vibration Explorer BZ-5623, for data management and post-processing
Specifications
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Type 4447 complies with the following national and international standards: |
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. ISO8041:2005: Human response to Vibration. Measuring Instrumentation |
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. ISO5349.1:2001: Mechanical Vibration. Measurement and Evaluation of Human Exposure to Hand-transmitted Vibration. |
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Part 1: General Requirements |
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. ISO5349 .2:2001: Mechanical Vibration. Measurement and Evaluation of Human Exposure to Hand-transmitted Vibration . |
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Part 2: Practical Guidance for Measurement at the Workplace |
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. ISO2631.1:1997: Mechanical Vibration and Shock. Evaluation of Human Exposure to Whole-body Vibration. Part 1: General |
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Requirements |
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. EUDirective 2002/44/EC |
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SHOCK LIMITS |
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Max. Shock level for recommended transducers (± peak): 50 km/s2 |
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BATTERY |
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Rechargeable Li-ion battery 3.7 V, 2600 mA. Up to 4 h continuous use at room temperature after more than 6 h charging with the supplied charger, ZG-0459 |
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Note 1: If the instrument is operated at low temperatures, the operational time is reduced |
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Note 2: External Charger (ZG-0459) is not recommended for use during measurements as it may introduce noise |
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CLOCK |
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Real-time clock and time-stamped measurements |
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INPUT CHANNELS |
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Type 4447 has 3 and 1 analogue input channels and a USB digital I/O. |
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The inputs are designed for triaxial and/or single-axis accelerometers and are equipped with selectable CCLD power supplies. Input channel sensitivity is designed for typical transducers used in human vibration measurements |
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CABLES |
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The maximum accepted accelerometer cable length is 3m (9.84 ft) |
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DETECTOR |
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Simultaneous measurement of weighted RMS, VDV, MTVV and Peak vibration value for each channel |
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FREQUENCY WEIGHTING |
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Filters for frequency weightings conform to ISO 8041:2005, including filters Wh, Wd, Wk, and Wm |
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DISPLAY |
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Color graphical display with a resolution of 124 ×124 pixels |
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Basic information regarding the instrument status is shown through icons, including: |
Battery indicator |
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Measurement status: Measure, Pause, Stop |
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Channel status |
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Overload (O) |
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Under-range (U) |
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Elapsed time: hh:mm:ss |
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CALIBRATION |
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Calibration Check Vibration Value: 10 m/s2 (3.16m/s2 for high sensitivity accelerometers . positions 5 and 10) |
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Calibration Check Frequency: 159.2Hz |
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Electrical Calibration Check Voltage: 100mV for Type 4515-B-002 and 10 mV for Type 4520 |
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PHYSICAL DIMENSIONS |
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Size: 70 × 135 × 28 mm (2.7 × 5.3 × 1.1 in) |
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Weight: 260 g (9.2 oz.), battery included |
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