Measurements of Human Vibrations

The Precision Vibration Meters Nor133 and Nor136 are designed in accordance with ISO 8041. In their basic versions, both meters are well suited for measurement of whole body and hand arm vibration measurements. Optional upgrades allow for the measurement and analysis of vibration in buildings, ships, vehicles and public transport systems in accordance to international and national standards. The units are also suitable for general machine vibration. User interface is simple and easy to use whilst the large backlit display and the small physical dimensions make the unit ideal for field use. The Nor133 and Nor136 have several unique features not found in similar vibration meters.

Raw data recording (option 1)

Optionally, the Nor133 and Nor136 may record the vibration signal onto a SD memory card simultaneously with the measurement, for later and more sophisticated signal analysis in the PC program NorVibraTest. This option gives the opportunity to assess the same measurement at a later time with any desired weighting functions, e.g. if standards have changed or to new criteria. In other words, the measurement doesn’t need to be repeated on a machine or vehicle if the standards change. Just analyse the old raw data again using the new weighting functions!

6 channel whole body assessment

Set to the whole body mode, the Nor136 may record and measure up to 6 vibration channels simultaneously. A comprehensive WB assessment should be carried out in a 6-channe mode, where 3 channels measure the WB vibration of the subject and the other 3 channels measure the vibration of the source. The correlation of these data can then be examined in the NorVibraTest program to determine the transfer function, of the driver’s seat for example, so unknown influences or artefacts can be removed from the WB measurement.

Synchronising more Nor133 / Nor136 or the Noise analyser Nor140

Another useful feature is the ability to synchronise a vibration measurement with a noise measurement made with the Nor140 Sound Analyser. Both measurements may be synchronized by the time information and may later be analysed with the NorVibraTest program to allow cause and effect relationships to be examined in more detail. In the same way two Nor133/136 may be synchronised.

Enhanced overload detector
Although the units feature more than 95dB dynamic range, overload may occur. A special overload display shows the % of overload per channel. Thus, the user may validate to use the measured data if the overloaded part of the overall measurement time is small.

Comment microphone

A build in microphone channel can record comments before or after a measurement. Just press the voice button and speak in your comments associated with the measurement. It may also record the noise during measurements. The upper frequency during a measurement is however limited and the information may therefore be limited.

Options
The Nor133 and Nor136 may be extended with a selection of optional features, thereby allowing you to tailor the instrument to your specific requirements. Optional features may be ordered and installed at any time by just adding a new set of option codes:

1. Option 1: Raw data recording.
2. Option 2: Extended standard support level 1.
3. Option 3: Level versus time.
4. Option 4: DC and charge input.
5. Option 5: Extended standard support level 2.
6. Option 6: Data export to National Instruments DIAdem software.

Features and applications

• Whole body vibration to ISO 2631, EN/2002/44/EC
• Hand Arm vibration to ISO 5349, EN/2002/44/EC
• Building Vibration measurement to DIN 4150-2, ISO 2631, BS6472
• Ship cabin vibration measurements to ISO 6954
• General machine vibration – data logger
• 6 channels (Nor136) in whole body mode
• Graphical and numerical display of all channels simultaneously
• Huge memory capacity with SD memory card
• Records the raw data signal for later analyzed in NorVibraTest
• Powerful post processing software NorVibraTest
• Complete range of accelerometers for HA and WB measurements
• Multi language
• Comment channel
• Supports, IEPE, Charge, AC and DC voltage sensors
• Data export to National Instrument DIAdem software

For complete specification and demo of the device, contact us via our contact form.

Norsonic has a carefully selected range of single and triaxial accelerometers. All accelerometers are piezoelectric share type with integral preamplifier, so called IEPE or ICP accelerometers.

General purpose single axis accelerometer Nor1270

Nor1270 is a general purpose accelerometer for industry and laboratory use.

Miniature single axis accelerometer Nor1271

Nor1271 is a general purpose mini-ature accelerometer for industry and laboratory use. It is specially suited for light test objects and applications that require an accelerometer with low sensitivity and wide frequency response.

Triaxial seat pad accelerometer Nor1286

This triaxial seat accelerometer is designed for whole body measurements according to ISO2631 and ISO8041. The integral cable is 2m and the connector fi ts the Nor133 and Nor136 vibration meters. The seat pad consists of a rubber pad, an aluminum mounting adapter plate to where a triaxial accelerometer type Nor1288 is mounted. The Nor1288 accelerometer port is detachable for calibration purpose.

Triaxial miniature accelerometer Nor1287

This accelerometer is designed for hand arm vibration measurements according to ISO5349 and ISO8041 as well as general vibration measurements. The small physical dimensions and weight ensures low infl uence and easy mount on the measurement object.

Triaxial accelerometer Nor1288

The triaxial accelerometer Nor1288 is designed for general vibration measurements and as a reference accelerometer when conducting whole body measurements using the 6 channel vibration meter Nor136. The Nor1288 is then mounted on the vehicle itself and the correlation between the vehicle vibrations and the drivers seat can be measured.

Triaxial Velocity Sensor (Geophone) Nor1292

32 mV/mms-1. 3-axial passive velocity transducer has screw-adjustable feet and libelle for horizontal alignment. With 2 m cable and 7 pin LEMO connector.

For complete specification of the vibration transducers, contact us via our contact form.

A powerful tool for post processing and creation of measurement reports based on captured raw data. The program is mainly made for assessment of human vibration measurements. The program handles up to 6 measured vibration channels. The program requires that the Nor133 or Nor136 is equipped with option 1, raw data recording.

The program recalculates the different indices based on the raw data signal according to the selected standard.

The user can merge several measurements done at different workstations to obtain the total A(8) value.

Delivered with the instrumentation is also a simple-to-use conversion program called NorVibConverter Nor1044. The .vcd or .vlt files from the 133/136 are then converted in a .txt file as shown. It is possible to calculate the A(8) according to the different standards applicable.

Features – Nor1038 NorVibraTest

• Project oriented system
• Calculation of all weighted features for multi-file measurements
• Re-calculation according to different standards eg. if the standard change.
• Displays e.g. weighted and un-weighted time signal, frequency spectrum, power density
• Additional weighting functions available
• Export of the vibration signals to ASCII
• Zoom
• Calculated values between cursors
• Correlation verification between channels
• Calculation of A(8) for multi-step cycles
• Report generator based on Microsoft® Word for generating user defined reports
• Multi language (German and English)

For complete specification and demo of Nor1038 NorVibraTest, contact us via our contact form.