VATS (Vibration Analysis Toolset)
Concern for the hazards related to exposure of the human body to vibration from power tools, vehicles and machinery has increased in recent years. Both whole body vibration and hand arm vibration can cause physical damage and considerable increased compensation costs. Various standards have been implemented to address this important hazard area.
The VATS Series of vibration analysis products has been developed to enable users to readily obtain vibration data for comparison to the various standards. (VATS is a trademark of NexGen Ergonomics Inc)
Vibration Analysis Toolset Specifications
VATS-HA-PKG Hand-Arm Analysis
|Includes accelerometer (Series 2 or 3), mounting kit, analysis software|
|Acceleration||± 10g max (98 m/s2)|
|Cross-Axis Sensitivity||less than 5%|
VATS-WB-PKG Whole Body Analysis
|Includes Series 2 accelerometer, seat pad, analysis software|
|Dimensions (seat pad)||200 mm diameter and 12.7 mm thick in the center|
|Cable Length||2400 mm|
|Acceleration||± 10g max (19.6 m/s2)|
|Cross-Axis Sensitivity||less than 5%|
|Dimensions||104 x 62 x 22 mm|
|Battery Type||2 x Alkaline AA
(see below for recommendations)
|Battery Life||5-20 hours nominal depending on sensor type and quantity
(see below for guidance)
|Microprocessor controlled programmable gain amplifiers|
|Memory Internal||2GB Micro SD card|
|Bluetooth® Adaptor||Microsoft Bluetooth® stack compatible|
|Front End ADC||14 bit giving +/- 4000 counts resolution|
|Recording Mode||Record to Bluetooth® and Micro SD card
Record to Micro SD card only
Record to Bluetooth® only
|Range of Sampling frequency per analog channel||1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 1250, 2000, 2500, 5000, 10000, 20000 Hz
(note: Bluetooth is used for monitoring only at the higher sampling rates)
|1mV and 3mV||DC to 1KHz (+0dB / -3dB)|
|10mV to 3V||DC to 10KHz (+0dB / -3dB)|
|An automatic anti-alias digital filter: approximately -3dB at 0.45 x sampling rate
and a maximum attenuation of -13dB above 0.8 x sampling rate
|Power Supply per channel||Adjustable 0 to 4.6 Vdc|
|Current Supply per channel||≤ 20 mA|
|Accuracy||Better than +/- 0.5% full scale|
|Maximum Common Mode||1.2 V|
The following batteries are recommended:
- Energiser Ultimate Lithium L91 (size AA 1.5V, quantity 2)
- Duracell Ultra LR6 – MN1500 (size AA 1.5V, quantity 2)
We do not recommend the use of any rechargeable cell technology. Do not use as this will cause problems with auto power down and stability of recording to card.
The maximum length of a recording will be influenced by the batteries as follows:
- Manufacturer and type of battery used
- Condition of battery at start of recording (i.e. new or part used)
- Number and type of sensors attached
- Total sampling frequency selected
- Data storage mode selected
The following is given for guidance only :
|Recording Mode||Sensors||Recording Length (Hours)|
|Energiser Ultimate Lithium L91||Duracell Ultra LR6|
|Micro SD Card Only||8 Goniometers or EMG||20||9|
|Micro SD Card Only||4 Goniometers or EMG||20||9|
|Micro SD Card Only||2 Goniometers or EMG||20||9|
|Micro SD Card Only||1 Goniometers or EMG||20||10|
|Micro SD Card Only||1 Accelerometer ACL||17||8|
|Micro SD Card and Bluetooth||8 Goniometers or EMG||11||5|
|Micro SD Card and Bluetooth||4 Goniometers or EMG||15||7|
|Micro SD Card and Bluetooth||2 Goniometers or EMG||16||8|
|Micro SD Card and Bluetooth||1 Goniometers or EMG||17||8|
|Micro SD Card and Bluetooth||1 Accelerometer ACL||13||6|
Series 2 Accelerometers
|Dimensions||L x H x W (29.50 x 11.60 x 15.30 mm)|
|Enclosure||Aluminum grade 6063TF anodized|
|Cable Length||2440 mm or 8ft|
|Acceleration||10g max (98 m/s²)|
|Cross-Axis Sensitivity||Less than 5%|
|Sensitivity (set up within management software)||± 1.00 Vdc = ± 10g, Resolution 0.0025g
or ± 300 mVdc = ± 3g, Resolution 0.00075g
or ± 100mVdc = ± 1g, Resolution 0.00025g
(all 3 options allow for full 13 bit resolution of ± 4000 counts)
|Supply Voltage||+4.6 - 5.0 Vdc (X axis only).
All 3 axes powered by X axis plug.
|Accuracy||Better than ± 2 % full scale|
|Low Pass Filtering||100 Hz, 500 Hz, 1,250 Hz user adjustable via links by removing lid of interface unit.
Low pass filtering 8 pole, 8th order 1.2 Elliptic
|Shock Survival||500g unit powered, 1000g unit not powered|
|Environment||Operating temperature 0°C to 70°C|
Series 3 Accelerometers
|Dimensions||L x H x W (0.54 x 0.51 x 0.54 inches)|
|Material, Housing/Connector||Titanium alloy|
|Range, F.S. (each axis)||±1000 G|
|Sensitivity (set up within management software)||Channel Sensitivity||Full Scale (nominal)|
|Low Pass Filtering||1,250 Hz, 2,500 Hz, 5000 Hz, user adjustable via links by removing lid of interface unit.
Low pass filtering 8 pole, 8th order 1.2 Elliptic.
|Full Scale Voltage Output||±1 Volts|
|Element Natural Frequency, Nom.||30 kHz|
|Equivalent Electrical Noise||.007 G, RMS|
Linearity is % of specified full scale (or any lesser full scale range), zero-based best fit straight line method.
|Transverse Sensitivity, Max.||5 %|
|Signal Polarity||Positive for motion in direction of arrows etched on housing|
|Maximum Vibration||1200 G|
|Maximum Shock||5000 G|
|Temperature Range||-40 to +175 °C|
Comprehensive Human Vibration Analysis Solution
The key features of VATS include:
- Multiple tri-axial accelerometers can be connected
- 8 channels can be expanded to 24 channels
- All raw data is stored on Micro SD cards with 2GB of storage memory available
- Other sensors such as goniometers and EMG sensors can be connected
- Powerful and easy to use analysis software
Leading organizations worldwide use VATS. These include vehicle and tool manufacturers, government organizations, universities, corporations and consultants. VATS unique features include the ability to handle multiple accelerometers and other sensors with large amounts of storage that can then be easily analyzed by our powerful yet easy to use software.
The VATS series of human vibration analysis products are available as individual packages for either hand-arm or whole body analysis. The VATS includes the DataLOG MWX8 that is a fully portable, subject worn, programmable data acquisition unit. The DataLOG collects data from the accelerometers and/or from a variety of additional sensors such as electrogoniometers, force sensors and EMG. Data can be transmitted real-time directly to the computer via the wireless Bluetooth connection or stored on the 2GB MicroSD card that is then later downloaded to a PC for detailed analysis.
DataLOG has a maximum sampling rate of 20KHz/channel (160KHz maximum on 8 channels), 2GB flash and telemetry option. Up to 3 DataLOG units can be synchronized for a total of 24 analogue channels. The DataLOG is connected to the host PC for both programming and downloading of data. Data for X, Y and Z axes of the accelerometers is simultaneously collected. When recording in MicroSD Mode only synchronization options for 16 or 24 channels are available with sampling rates up to 20,000Hz per channel (160KHz total Sampling frequency).
With the VATS, the user can either perform detailed analysis with full reporting on a local PC or send the data electronically for analysis at a central corporate site. This approach simplifies data collection and incorporates sophisticated analysis with user-friendly software and comprehensive help. Raw data is available for analysis.
A real-time clock is included in the DataLOG to enable every recording to be marked with an accurate start date and time with its duration. A switch-mode power supply is used to obtain the maximum life from a set of two inexpensive AA batteries.
The VATS is available for either hand-arm or whole body analysis. Hand-arm vibration analysis is based on the ISO 5349 and ACGIH standard for hand arm vibration (HAV). Whole body vibration analysis is based on the ISO 2631-1, 2631-5, BS 6841, and ACGIH standard for whole body vibration (WBV).
Data Analysis performed:
- Fast Fourier Transfer
- 1/3 Octave band analyze
- Weighted and unweighted RMS
- Band-pass Butterworth filter
- Filtering window
- Waterfall plot
- Spectrum plot
- 1/3 octave band plot
- Crest factor
- Vibration dose value
- TLV / Caution zone value for ISO and ACGIH standards
- RMS history and summaries
- All calculated values can be exported to spreadsheets, word processor, etc
- Graphic output can be copied as bitmap
A 1.8 meter cable with a suitable connector at one end to connect to the DataLOG, and a hand held switch at the other. This useful accessory allows time marks to be superimposed on the recorded data.
For synchronization of multiple DataLOGs for data collection when in MMC only mode:
- SYNC2: To synchronize 2 DataLOGs for up to 16 analog and 8 digital channels of data acquisition
- SYNC3: To synchronize 3 DataLOGs for up to 24 analog and 12 digital channels of data acquisition
Cable length: 500 mm
Synchronization: Better than 8 milliseconds
This cable is an extender cable for users who want to use two axis of a 3rd accelerometer on a single DataLOG unit (i.e. for connecting to analog channels on the opposite side of the DataLOG unit). This is only applicable to Series 2 accelerometers.