EEE 327/309: Measurement and Instrumentation

Flashcards covering key concepts in measurement and instrumentation.

A measuring system consists of __ basic elements: Sensor, Transducer, and Transmitter.

Sensor, Transducer, and Transmitter.

The first element in any measuring system is the __, which gives an output that is a function of the measured input.

Sensor

One important parameter of a sensor is __, which indicates the smallest discernible change in the measured value.

Resolution

A device that converts variations in a physical quantity to an electrical signal is known as a __.

Transducer

The main objective of a transducer is to react only for the measurement under __ limits for which it is designed.

specified

In measuring instruments, __ refers to the difference between the measured value and the actual value.

Error

The __ effect is utilized in electrostatic voltmeters.

Electrostatic

An __ instrument has an output that varies continuously as the quantity being measured changes.

Analogue

The __ type instrument indicates measurement by deflection, while the null type uses weights to balance pressure.

Deflection

The __ principle is applied in the operation of a Wheatstone bridge to measure resistance accurately.

Null

In a Wheatstone bridge, the resistance R1 is changed until the voltage across points BD is __.

zero

The __ of a thermocouple is the device's ability to produce an electrical voltage when there is a temperature difference.

Thermoelectric effect

The primary function of a thermistor is to exhibit a change in __ with changing body temperature.

electric resistance

Hall effect sensors are made from __ materials and are used to detect the presence of a magnetic field.

semiconductor

High precision in measurement involves minimizing __ error while ensuring accuracy.

random

The relationship between input and output in a transducer should be characterized by __.

Linearity

A __-type instrument gives a visual indication of the magnitude of the physical quantity measured.

Indicating

For digital instruments, their output varies in __ steps, allowing only finite values.

discrete

In measuring instruments, __ pressure describes the pressure of a fluid compared to atmospheric pressure.

Gauge

The difference between precision and __ refers to how close measurements are to the true value.

accuracy

The use of an analog-to-digital converter is necessary when interfacing __ instruments to digital systems.

analog

A __ flow meter relies on Faraday's law of induction for measuring fluid flow.

electromagnetic