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The quality of the measuring instrument can be reflected by its accuracy, reproducibility, sensitivity, response time, zero drift, and range drift.
(1) Accuracy: Also called accuracy, that is, the accuracy of the instrument's measurement results close to the real value. Can be expressed as absolute error or relative error:
1 Absolute error = measured value - true value
2 relative error = absolute error / true value
Any instrument cannot measure the true value of the measured parameter with absolute accuracy, only the ability to make the measured value close to the true value. In practical applications, only the indicator value of the standard meter with higher accuracy is used as the actual value of the measured parameter, and the difference between the indication value of the measurement instrument and the indication value of the standard meter is the measurement error. The smaller the error value, the higher the reliability of the measuring instrument.
(2) Reproducibility: refers to the percentage of the difference between the measured value and the average value with respect to the maximum scale range when the same meter is used to repeatedly measure a certain parameter under the condition that the measurement condition is not changed. This is an important indicator of the stability of instruments and meters. It is generally required to carry out inspections at the time of commissioning and daily verification.
(3) Sensitivity: Refers to the sensitivity of the instrument measurement. The ratio of the change in the output of a common instrument to the change in the measured parameter that caused the change.
(4) Response time: When the measured parameter changes, the measured value indicated by the instrument will always be accurately expressed after a period of time. The time when the measured parameter changes and the time delay is the reaction time of the instrument. Some use the time constant (such as thermal resistance temperature measurement), and some use the damping time (such as the current meter resistance measurement).
(5) Zero drift and span drift: refers to the percentage of the average change value relative to the range after multiple measurements of the relative zero point and maximum range confirmed by the meter.
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