Data viva — pressure transducer and temperature sensors

Stimulus

A diagram shows a pressure transducer with a diaphragm deforming under fluid pressure, four strain gauges arranged in a Wheatstone bridge connected to an amplifier and a waveform display, with dashed lines showing zeroing to atmosphere and levelling to the mid-axillary line. Alongside it are two temperature-sensor schematics — a thermistor (resistance falls with temperature) and a thermocouple (two dissimilar metal wires joined, Seebeck voltage). Describe how each works and give the clinical principles of zeroing, levelling and damping.