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Fully Automated Measurements
In case of many similar samples like in production sites with high capacities or where the test parameters have to be applied always in the same reproducible condition, the Leica VMHT AUTO brings its full capacity.
The operator just orientates the specimen on the motorized stage and defines the test parameters using the Leica Materials Workstation.
Consecutively, the system performs the measurements fully automated without any further attendance.
Enhanced Labour Productivity
Since the VMHT AUTO is destined to perform its measurements unattended, it leaves the personnel capacity free for other tasks, e. g. sample preparation.
Ease of Use
No extensive elaborate training or programming knowledge is required to operate the system.
The Leica Materials Workstation (working under the latest WINDOWSTM software) offers a simple working environment. The operator is able to recall previously defined measuring routines.
Configuration
The Leica VMHT AUTO comes completely configured and calibrated including the Performance Station PC with 17"color display monitor.
The system is available in 2 configurations:
- VMHT AUTO man – is a semiautomated system with manual stage and focus control. The image is acquired via TV camera and evaluated by means of the Leica Materials Workstation.
- VMHT AUTO mot – is fully automated and has both motorized stage and focus control including Autofocus function.
A trackball servers for motion control of x/y and focus movement.
Measurement Process
The pattern can be predefined by different methods, i. e. either by simply moving the stage to the desired indention spots using the trackball or moving the stage to the desired starting point of the pattern and keying in the distances and directions of consecutive imprints.
When all testing parameters are set, the system automatically moves from spot to spot,
focuses the specimen by calculating the optimum focus position (integrated Autofocus function).
The high resolution TV camera acquires the image via frame grabber board and the sophisticated measuring software routine calculates
the diagonal lengths and the resulting hardness value based on the chosen test force.
All results are immediately listed in a table and can be stored in a MicrosoftTM Access database.
From there the data can be exported to application programmes like MicrosoftTM EXCEL. Reporting can be done by using MicrosoftTM WORD.
Accuracy
Since a personal judgment caused by the operator is totally eliminated, the imprints are measured permanently under reproducible conditions.
The high resolution TV camera and the stage increment below 1 µm guarantee highest measurement accuracy.
Another advantage linked with automated measurements is the avoidance of fatiguing the operator thus introducing measurements errors.
Change of Test Load
All of the Leica VMHT models have motorized selection of the test forces. As a consequence, the test force can also be changed by the Materials Workstation. This offers the unique possibility of creating e. g. hardness profiles based on different test forces. |
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