Definitions Used in Electrical Measuring Instruments:
Definitions Used in Electrical Measuring Instruments:
True Value:
It is the exact value or the perfectly correct value in any measuring scheme.
It is defined as the average of infinite values taken when the average deviation due to various contributing factors approach zero.
True value is the one which we cannot reach my experiments. In actual practice true value is usually taken from a laboratory standard or obtained with all possible error-cancelling provisions.
It is the exact value or the perfectly correct value in any measuring scheme.
It is defined as the average of infinite values taken when the average deviation due to various contributing factors approach zero.
True value is the one which we cannot reach my experiments. In actual practice true value is usually taken from a laboratory standard or obtained with all possible error-cancelling provisions.
Accuracy:
We cannot say any measurement will be exactly correct.
The term Accuracy is used to express how much is near the measured value to the true value. When we say the readings obtained are very accurate, it means the readings are true for all practical purposes.
We cannot say any measurement will be exactly correct.
The term Accuracy is used to express how much is near the measured value to the true value. When we say the readings obtained are very accurate, it means the readings are true for all practical purposes.
Precision:
It tells the method which gives the best possible accuracy. When we say the instrument is precise instrument, it means that the instrument will give uniformly equal readings repeatedly, for a given quantity measurement.
In short, precision refers to the ability of an instrument to give consistent readings.
It tells the method which gives the best possible accuracy. When we say the instrument is precise instrument, it means that the instrument will give uniformly equal readings repeatedly, for a given quantity measurement.
In short, precision refers to the ability of an instrument to give consistent readings.
Error:
Using an electrical instrument what we measure is termed as actual value. The perfect reading is the true value. So error is defined as the difference between the measured value and true value.
Error = Measured Value – True value.
Using an electrical instrument what we measure is termed as actual value. The perfect reading is the true value. So error is defined as the difference between the measured value and true value.
Error = Measured Value – True value.
Sensitivity:
It means the ability to feel or realise readily and accurately the slight change in the input quality. When an instrument is reacting to even a slight difference in the input quantity we can say that insturment is very sensitive.
It means the ability to feel or realise readily and accurately the slight change in the input quality. When an instrument is reacting to even a slight difference in the input quantity we can say that insturment is very sensitive.
Resolution:
In instrumentation, the resolution means the smallest changed in the input signal that can be detected by the instrument. The resolution is usually expressed as a fraction or percentage or full-scale value.
In instrumentation, the resolution means the smallest changed in the input signal that can be detected by the instrument. The resolution is usually expressed as a fraction or percentage or full-scale value.
Instrument Efficiency:
It is defined as the ratio of measured quantity to the power taken by the instrument at full scale deflection.
It is defined as the ratio of measured quantity to the power taken by the instrument at full scale deflection.
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Definitions Used in Electrical Measuring Instruments:
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March 10, 2019
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