- The Dynatest LWD electronics are interfaced to a handheld PDA via a wireless Bluetooth connection.
- The LWD electronics are dust and splash proof (IP56) for safe outdoor use.
- The drop height is easily and quickly adjusted by a movable release handle.
- A laser engraved scale on the weight guide shaft allows for easy setting of the desired drop height
- The magnitude of the impact force is determined from actual measurements by a precision load cell, measuring the time history and peak value of the impact force from the standard 10kg (22lbs.) or the optional 15kg (33lbs.) or 20kg (44lbs.) drop weight setups.
- The loading plate diameter can quickly and easily be switched between 300mm (11.8in.) and 150mm (5.9in.). A 100mm (3.9 in.) plate diameter is included, and an optional 200mm (7.8 in.) plate is available.
- The centre deflection time history and peak value is measured through a hole in the loading plate by a highly accurate, seismic transducer (geophone).
- An integrated lever to ensure the centre geophone is correctly centred and seated.
- The field programme can be linked to a GPS.
- Optionally, two more geophones can be added.
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Key Dynatest LWDmod Analysis Software Features: |
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The Dynatest software package LWDmod offers advanced features for data organization, analysis and reporting:
- Imports data into a project database, allowing organization of multiple files into one database.
- Graphical features to view test results, and to eliminate selected drops or points from the file.
- Editing features.
- Automated selection of drops to be used in the analysis.
Calculation of surface moduli.
- Back-calculation of layer moduli for multi-layer systems, using the results of multiple tests.
- Calculation of subgrade non-linearity.
- Calculation of needed overlay thickness, based on design surface moduli.
- Analysis of load/deflection time histories.
- Graphical presentation of all analysis results.
- Capability to export result tables and graphics.
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Key Field Software Features:
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- The data collection software, residing on the PDA, displays - in real time - the surface modulus and the time history graph from both the geophone(s) and the load cell.
- Relevant information such as name, place and comments can be added to the data file for each measuring point.
- Poisson’s ratio and stress distribution factor parameters may be defined by the operator.
- With the use of a “SmartPhone”, data can be collected and e-mailed or sent directly to a server.
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