Measuring amplifier
With a measuring amplifier , electrical quantities are filtered, linearized, amplified, normalized and set in relation to the mass. Prepared in this way, the output signals from sensors from different manufacturers can be transported and processed as a standard signal , for example in research, medical technology , building management systems , in manufacturing processes , for monitoring and alerting in the event of limit value violations, and for recording measured values for quality assurance. Special and high-quality measuring amplifiers are very often found in measurement laboratories and research institutes .
The analog signals from force transducers , strain gauges , resistance measuring bridges , but also currents , voltages and frequencies from other sensors are processed with measuring amplifiers for a wide variety of measurement, regulation and control tasks and are often evaluated on control computers or PCs .
Measuring amplifiers usually consist of several amplifier and filter circuits that process the signal, a measuring transducer for normalizing the measuring signal, and possibly a downstream switching amplifier that provides alarm functions. Measuring amplifiers are often built with multiple channels so that several signals are recorded and converted together.
Application criteria and calibration of measuring amplifiers
- Design, for example 19 "technology , top-hat rail, installation in sensor housing
- Output variable - standard signal, voltage range, current signal
- Measuring range, possibly adjustable or programmable
- Zero adjustment - calibratability
- Adjustment of the gain factor - calibratability
- Long-term drift behavior, possibly artificial aging
- Filtering of disturbance variables - EMC behavior
- Environmental influences, for example dust, water, moisture
- Adjustability of alarm and limit values