Static characteristics refers to the static relationship between the valve stroke and the input signal, it is also called static characteristics. The following is a basic definition of various statics. 1, the basic error Under the specified reference conditions, the maximum difference between the characteristic curve of the actual trip and the characteristic curve of the specified trip is called the basic error. 2, start, end point deviation Start point deviation is also called zero point error, the end point deviation is also called end point error. Instrument under the conditions of the use of the provisions of work, when the input is the signal range of the upper and lower limits, the Control valve corresponding stroke error is called the beginning and end of the deviation. The start and end deviations are expressed as a percentage of the rated stroke of the regulating valve, and the rated stroke deviation is the error of the rated error when the meter is operating under the specified conditions and is referred to as the rated stroke deviation. 3, back to the same input signal rise and fall of the two corresponding maximum difference between the values. 4, Dead-zone input signal changes in the positive and negative directions will not cause any possible change in the journey of the limited range (Figure "#"). 5, repeatability In the same working conditions, the same input value in the same direction measured the consistency of the value of the repeated many times between the repeatability. Repeatability indicates the size of the instrument random error. The repeatability of the control valve is determined using the maximum repeatability error of each input value across the entire range. Repeatability does not include hysteresis and hysteresis. 6, reproducibility In the same working conditions and the specified time, the same input value from two opposite directions repeatedly measured the degree of consistency between the output value is called reproducibility. Reproducibility includes dead zone, hysteresis, drift and repeatability. Reproducibility is determined by the maximum difference between the respective rising and falling output values ​​measured repeatedly over the same range for the same range and expressed as a percentage of the span. 7, linearity error calibration curve and the appropriate straight line (independent straight line, zero base straight line, straight line) the maximum deviation between the linearity error. In the entire input signal range, the two directions of rising and falling more than two measurements at each measurement point of the input signal to obtain the average of each data points drawn with these points between the average curve and the straight line The biggest difference is the linearity error.
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