MEASUREMENT ELEMENT DEFINITIONS Primary Sensing element Retrieves energy from the measured system Produces some form of output Strain gage, thermometer tip Variable conversion element Changes data from one physical form to another Elongation to resistance, temperature to volume change Variable manipulation element Performs mathematical operation on data Amplifier, filter Adapted from ErnestO. Doebelin, Measurement Systems Application and Design, McGraw Hill
MEASUREMENT ELEMENT DEFINITIONS – Primary Sensing element • Retrieves energy from the measured system • Produces some form of output ¾ Strain gage, thermometer tip – Variable conversion element • Changes data from one physical form to another ¾ Elongation to resistance, temperature to volume change – Variable manipulation element • Performs mathematical operation on data ¾ Amplifier, filter Adapted from Ernest O. Doebelin, Measurement Systems: Application and Design, McGraw Hill 6
MEASUREMENT ELEMENT DEFINITIONS Data transmission element Gets data between measurement elements Wire, speedometer cable, satellite downlink system Data storagelplayback element Stores data for later retrieval hard drive, RAM Data presentation element Gets data to form detectable by human Indicators, alarms, analog recording, digital recording Adapted from Ernest O. Doebelin, Measurement Systems: Application and Design, McGraw Hill
MEASUREMENT ELEMENT DEFINITIONS – Data transmission element • Gets data between measurement elements ¾ Wire, speedometer cable, satellite downlink system – Data storage/playback element • Stores data for later retrieval ¾ Hard drive, RAM – Data presentation element • Gets data to form detectable by human ¾ Indicators, alarms, analog recording, digital recording Adapted from Ernest O. Doebelin, Measurement Systems: Application and Design, McGraw Hill 7
OBSERVATIONS ABOUT THE ELEMENTS Two primary functions Extract data Present data Two points of intended contact with the"outside world Functional blocks Can have more than one of each type Not all measurement systems have all functions May be in any sequence(except primary sensing and data presentation)
OBSERVATIONS ABOUT THE ELEMENTS • Two primary functions – Extract data – Present data • Two points of intended contact with the “outside world” • Functional blocks – Can have more than one of each type – Not all measurement systems have all functions – May be in any sequence (except primary sensing and data presentation) 8