The customer carries out various long-term soil tests carried out under different forces. After 16 years of uninterrupted operation of the system described here the customer selected our company again for upgrade of the measurement. In the meantime a lot of new test definitions occurred which led to the need for more universal system still maintaining complete functionality of original one.
The tests take place in a laboratory at a number of stations. They operate mostly independently of each other. Each system measures pressure, force and displacement at all assigned sites, displays them in a graph and numerically, monitors test time, and secures not to exceed specified limits. The system archives the data, supports calibration of the entire measuring chain, etc.
The measurement itself is carried out in a so-called measuring box, which is a small aluminum box, containing a carrier for modules for signal conversion from inductive sensors (so-called 5B modules) and a digitizing card that converts analog values to the USB bus. The measuring box also includes a USB hub, which allows four GDS devices to be controlled and data collected. Thus, one measuring box is equipped to serve two test stands or one triaxial test station. However, the system is so versatile that it is also used for many other partial measurements.
The system allows to set all of the sensors and devices used by the customer, as shown in the figure.
Measurement parameters are also set – sampling frequency, channel sets, their calibration files, data file, etc. After setting the whole measurement scenario, the measurement is started. Measurements runs at up to nine stands, at which one single measurement runs a set of channels. Measurements at stands are independent each other, but they can use the same channels or even different channels associated with a single sensor. The timing of measurement is individual at each stand. As shown in the figure, the program provides the operator with basic information about the status of the measurements during the measurement, because these measurements are usually long-lasting, lasting from days to weeks.
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