Weighing terminals

Weight terminals (weight indicators) — electronic measuring instruments that are used for the production of electronic scales are the basis. Modern weighing terminals are specialized microcomputers, which usually include an analog-to-digital converter, controller, memory, and information transfer port microcircuits. Weighing terminals perform the following functions:

• continuous display of weighing results on scales
• transfer of weighing results to a personal computer for saving in a database
• transfer of information to printing devices
• control of the weighing process with issuing commands to external devices
• reception of external control signals
  

When a mechanical load is applied to strain gauges, their electrical characteristics change in proportion to the law of load change. In addition to useful (informative) changes in the signal from strain gauges, numerous parasitic signal changes occur. They are caused by short-term (jumps in the power supply, electrical interference on the strain gauge and connecting cable) and slowly changing influencing factors (temperature changes, microdisplacements of the point of application of forces, processes occurring inside the crystal lattices of the strain gauge and the base of the strain gauge under the influence of applied mechanical force) and much more . For these reasons, a modern weighing terminal must have perfect hardware and software support for methods of analyzing and counteracting spurious signal changes.