13/88 3.2.2 Measured Value versus True Value 5.Calibration and Application Conditions Desired Input: 习Pressure Other possible Inputs: Temperature,acceleration,vibration,etc. It is important to carefully consider the relationship between the calibration conditions and the actual application conditions. Pointer Fluid Piston Piston rod Spring Linkage and scale Primary Vorioble- Motion Variable- Motion Dato- Pressure Force sensing conversion tronsmission conversion Measured element element element element element element Figure 3.2 Pressure Gauge 14/88 3.2.3 Some Basic Statistics(统计学) 1.Probability Cumulative Probability Trial Number Scale Reading(kPa) 1 10.20 True Pressure (Reference Value)=10+.001kPa 2 10.20 Ambient Temperature=20±1℃ 3 10.26 Acceleration=0 Vibration=0 4 10.20 5 10.22 6 10.13 7 9.97 8 10.12 9 10.09 9.809.85g909.9510001005101010.5102010.25103010350.4010.4510.50 scale reading.kPa 10 9.90 Distribution of Data 11 10.05 f(x)=Z 12 10.17 13 10.42 14 10.21 F(x) Probability Distribution 15 10.23 1.0 16 10.11 17 9.98 18 10.10 Cumulative Probability Distribution 19 10.04 Pressure-Gage Calibration Data 20 9.813.2.2 Measured Value versus True Value 5. Calibration and Application Conditions Desired Input： Pressure Other possible Inputs: Temperature, acceleration, vibration, etc. Figure 3.2 Pressure Gauge It is important to carefully consider the relationship between the calibration conditions and the actual application conditions. 13/88 Cumulative Probability Distribution Distribution of Data 3.2.3 Some Basic Statistics(统计学) 1. Probability & Cumulative Probability Trial Number Scale Reading(kPa) 1 10.20 2 10.20 3 10.26 4 10.20 5 10.22 6 10.13 7 9.97 8 10.12 9 10.09 10 9.90 11 10.05 12 10.17 13 10.42 14 10.21 15 10.23 16 10.11 17 9.98 18 10.10 19 10.04 20 9.81 TruePressure（Reference Value) = 10±.001kPa Ambient Temperature = 20±1℃ Acceleration = 0 Vibration = 0 Pressure - Gage Calibration Data Probability Distribution 14/88