Instrumentation can be defined as the use of measuring devices to determine the value of varying quantities often for the purpose of controlling those quantities within prescribed limits. OR
INSTRUMENTATION is a collective term for measuring instruments that are used for indicating, measuring, and recording physical quantities such as flow, temperature, level, distance, angle or pressure.
While Measurement are the methods, devices, and calculations used to measure electrical quantities OR are the quantity, size, weight, distance or capacity of a substance that are been actualize by a particular standard.
Describe the three [3] common features in an indicating instrument ?
- Deflecting devices: Whereby the mechanic force is produced by the current voltage or power. This force causes the moving system to deflect from its zero or null position.
- Controlling device: This device ensures that the deflection of the pointer for a given value of measured quantity always has the same value.
- Damping devices: This device always produce a force which quickly brings the moving system to rest in its final position after being deflected.
Explain what is meant by “Lissajous Pattern”
Lissajous pattern: When both pairs of the deflection plates [horizontal deflection plate and vertical deflection plates] of CRO [Cathode Ray Oscilloscope] are connected to two sinusoidal voltages, the patterns that appear at CRO screen are called the Lissajous pattern.