Sensors have been used in all aspects of our lives, and the number is rising. It is no exaggeration to say that from the vast space to the vast ocean, to all kinds of complex engineering systems, almost every modern project can not be separated from all kinds of sensors.

　　Here RenhotecIC a brief description of the accuracy, error and repeatability of the sensor.

　　Accuracy and precision are often confusing terms. ISO 5725(1994) actually use two terms "true" and" precision" to describe the accuracy of a measurement method; accuracy indicates the grouping or proximity of reading. Conversely, true indicates the degree of proximity of the test results to the reference or true values. This is often called precision. The ratio of positive and negative three times the standard deviation near the true value to the range refers to the maximum difference between the measured value and the true value; the resolution —— refers to the minimum measurement value that causes the change of the indication value; It should be separated from the sensitivity coefficient (sensitivity coefficient —— the ratio of output to input)


　　The accuracy of general domestic temperature sensors, for example, A、B two levels. The national standard stipulates as follows: according to the difference between the output value of the sensor and the true value of the measured temperature, Level A: not greater than ±(0.15℃+0.002* sensor range); level B: not greater than ±(0.30). Therefore, if the measurement accuracy is high, the sensor with small measuring range should be selected. resolution ," usually determined by the number of bits of the A/D converter ", or look at the last bit of its output value.

　　Causes of changes in measured readings listed in the ISO 5725:

　　Operator factors

　　Equipment used

　　Calibration of equipment

　　Environmental factors (temperature, humidity, air pollution, etc.)

　　Time difference between two measurements

　　Repeatability and reproducibility are two aspects of accuracy. When the condition is constant and the same operator uses the same instrument in a short time, repeatability is used to describe the minimum change in accuracy. In contrast, reproducibility describes the maximum change in accuracy, which changes over a longer period of time for different instruments and different operators.

　　The error is the difference between the measured value and the real value of the object under test. error does not include errors in the measurement process. The total error is usually a combination of systematic error and random error.


　　Systematic errors tend to change all measurements in a similar way, so the mean values of several measurements are shifted with the true values or changed in a predictable manner. When the true value is known, the system error can be corrected.

　　In contrast, the random error in the total error changes in an unpredictable way, so it is impossible to correct the random error.

　　RenhotecIC is a store selling a wide range of electronic products and our cable connectors are all purchased from Chinese ORIGINAL Equipment manufacturers with high quality and competitive prices.