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lesson21 - Lesson 21 Op-Amps #6 (Section 4-6) (CLO 4-3) The...

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Lesson 21 – Op-Amps #6 (Section 4-6) (CLO 4-3) The sixth lesson on Op-Amps focuses on designing Instrumentation Systems. After this and the next lesson, the students should be able to design simple instrumentation systems. Input Transducer Output Transducer K Gain Bias, b + + The heart of our instrumentation system is the building block diagram shown above. It consists of an input transducer, a gain stage, a bias or summer stage, and an output transducer. Suggest starting with some motivation of the importance of instrumentation systems: Stereo Systems, DVDs, CDs, VCRs, aircraft and automotive indicators, fly-by-wire controls, automation of all types, assembly plants, robots, etc. all employ instrumentation systems. The first item for discussion should be the transducer from the Latin trans-duce , to lead across. The transducer takes energy in one physical form such as light, temperature, flow, acceleration, velocity, strain, etc. and converts it (or leads it across) to another – in our case electrical. Input transducers are of two types: active and passive. Active transducers produce a voltage, albeit, usually small, that is proportional to the physical parameter being measured. Passive transducers generally vary a parameter such as resistance that is proportional to the physical parameter being measured, but need an applied source to make them useful. Some active input transducers are piezoelectric devices, thermocouples, acoustic devices, accelerometers, photocells, etc. Some passive input transducers are strain gages, photo resistors, key pads, potentiometers, thermistors, etc. Output transducers include alarms, lights, meters, displays, A/D converters, recorders, etc.
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lesson21 - Lesson 21 Op-Amps #6 (Section 4-6) (CLO 4-3) The...

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