Pneumatic control valve basic error will be the provisions of the input signal in a smooth increase or decrease the direction of the input to the actuator chamber (or locator), measuring the points corresponding to the stroke value to calculate the actual "signal - stroke" with the theory Relationship between the point of error, the maximum is the basic error. The test point shall include at least five points of 0%, 25%, 50%, 75% and 100% of the signal range. The basic error limit of measuring instrument is less than 1/4 of the basic error limit of the school valve. The hysteresis method is the same as (1). The maximum difference between the forward and reverse travel measured on the same input signal is the hysteresis. The method of always point deviation is the same as (1). The basic error at the lower limit (initial point) of the signal is the starting point deviation. The basic error at the upper limit (end point) of the signal is the end point deviation.
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