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Direct measurement

When the sensor instrument is used for measurement, the reading of the instrument can directly indicate the required result without any operation, which is called direct measurement. For example, measuring the current of the circuit with a magnetoelectric ammeter and measuring the pressure of the boiler with a spring tube pressure gauge is a direct measurement. The advantage of direct measurement is that the measurement process is simple and rapid, but the disadvantage is that the measurement accuracy is not easy to achieve high. This measurement method is widely used in engineering.

Indirect measurement

Some measured objects cannot or are not convenient for direct measurement, which requires that when measuring with an instrument, several quantities that have a definite functional relationship with the measured physical quantity are measured first, and then the measured values are substituted into the functional relationship, and the required results are obtained through calculation. This method is called indirect measurement.

Combined measurement

When the sensor instrument is used to measure, if the measured physical quantity must be solved by simultaneous equations to get the final result, it is called combined measurement. In combination measurement, it is generally necessary to change the test conditions to obtain the data needed for a set of simultaneous equations. Combined measurement is a special precision measurement method, which has complicated operation procedures and takes a long time, and is generally suitable for scientific experiments or special occasions.

Differential measurement

Differential measurement is a measurement method that combines the advantages of deviation measurement and zero measurement. It compares the measured value with the known standard quantity, obtains the difference, and then uses the deviation method to measure the difference. Therefore, this method has the advantages of fast response and high measurement accuracy, and is especially suitable for on-line control parameter measurement.