Tag: Instruments
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What is Calibration of the Sensor?
Calibration of the sensor is the relationship between the physical measurement variable input and the signal variable output for that specific sensor. Typically, a sensor or an entire instrument system is calibrated by providing a known physical input to the … Read more
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The Principle of Operation of an Induction Potentiometer
An induction potentiometer is a rotary type linear-variable inductor with two concentrated windings wound on the stator and on the rotor as illustrated in the figure below: Fig: Induction Potentiometer The rotor windings are excited with an AC, inducing voltage … Read more
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Basic Elements of an Electronic Instrument
An electronic instrument is made up of the following key elements: Transducer Signal modifier Indicating device Fig: Elements of an Electronic Instrument Transducer This is the first sensing element and is needed only when measuring a non-electrical quantity such as … Read more
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Electrical vs. Electronic Instruments
Despite the fact that both electrical and electronic instruments measure electrical quantities like voltage and current, they differ from each other in terms of the built-in features; for example, purely electrical instruments don’t possess any in-built amplifying device to increase … Read more
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How to calibrate a dc voltmeter
An instrument may be calibrated by comparing its reading with that of a more accurate instrument when both are measuring the same quantity. The more accurate instrument is used as a standard for comparison purposes. The figure below illustrates the … Read more
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How to calibrate a dc ammeter
The figure below shows two dc ammeters connected in series, so that they are both measuring the same current. Figure: DC Ammeter Calibration An ammeter may be calibrated by comparing it to a more accurate (standard) ammeter measuring the same … Read more
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Digital vs. Analog Instruments
Electronic instruments mainly voltmeters used either transistor or vacuum tubes. The later one is called The Vacuum Tube Voltmeter (VTVM) and the former one is called the Transistorized Voltmeter (TVM). In almost every field of electronics, VTVMs have been replaced … Read more