Measurement is the process to obtain information specific physical quantities, such as voltage (V), electric current (I), the resistance (R), conductivity (ρ), and others. The data obtained can be a value in the form of numbers (quantitative) or in the form of a statement is a statement or generalization (qualitative). Information obtained in a measurement called the data. In accordance with the nature of the measurement, the data can be divided into two types, namely: (1) quantitative data, and (2) qualitative data.
In the electric power transmission systems known the terms as follows: high voltage, extra high voltage and ultra high voltage. Statements about the voltage is referred to as data kualittatif. If the information obtained in the measurement of value / number then the data is called quantitative data, for example, a voltage measurement obtained (220 ± 5%) volts. Data obtained from the data collection, can be classified into two types, namely: (1) the empirical data, and (2) the data processed.
The empirical data obtained by direct current measurement (what is read in the meter). The empirical data is often referred to as unprocessed raw data further. Rated voltage read on the voltmeter is empirical data. Processed data obtained after specific processing, for example through a calculation. For example, if the measured voltage V and current I then resistance R = V / I once calculated result is called the data processed. This type of data is usually obtained from the process of data reduction.
In connection with the above data, the following data is collected from the results of a measurement process is then performed mathematical calculations or do rearrangement of data. Process / procedure is called data reduction or data processing.
Electrical measuring devices are the equipment needed by humans. Because of electrical quantities such as voltage, current, power, frequency and so can not be directly addressed by the five senses. To measure the electrical quantities, necessary tool modifiers. Or transformed into a massive scale in the form of mechanical motion using a measuring instrument. It must be realized that in order to be able to use various kinds of electrical measuring instruments need pemahanan adequate knowledge of concepts – theoretical concept.
In studying the measurements known for several terms, among others:
Instrument: is a measurement to determine the value or quantity besaransuatu or variable.
Accuracy: price nearest to where an instrument readings approaching the actual price of the measured variable.
Appropriateness: a measure of the ability to measure the results of a similar
Sensitivity: a comparison between the output signal or in response to changing instrument input or the measured variables.
Resolution: The smallest change in the measured value which the instrument will give a response or feedback.
Error: deviation of the measured variable price (the value of) the truth.
Electrical measuring devices are grouped into two categories, namely: (1) The standard measuring instruments, and (2) secondary measurement tool. Standard measurement tool commonly known as a measurement of the absolute; is a measure that indicates the magnitude of the electrical components measured by the boundaries of the constants and irregularities on the tool itself. This indicates that the tool does not need to be calibrated or compared with other measuring equipment first. Examples of this measure is a galvanometer.
Secondary measuring tool is a measuring tool that shows the price of electrical quantities measured and can be determined only on the deviation of the instruments. Previous measuring instruments calibrated by comparing the standard measuring tool / absolute. Examples of this measure is the electrical measuring instrument that is often used everyday.