Accuracy

Accuracy of a measurement instrument defines how much a measurement value may deviate from the perfect measured value.

The total error can be broken down into many component errors such as non-linearity, hysteresis, repeatability, temperature errors, stability, zero offset and span offset.

Accuracy is very closely connected with precision, but unlike precision it is constrained by a series of fixed reference points or absolute values that all readings are compared with to define the exactness of the instrument measurement. Typically these comparison absolute values are read from a more accurate instrument ideally with a 10 to 1 ratio difference in accuracy to ensure it does not contribute significantly to the overall error calculation. However in practise it is not always possible to achieve such a high ratio difference in accuracy. When this is the case the overall accuracy should also include the reference instrument uncertainty which better reflects the true accuracy of the device.

• 1,500 psig 4-20mA out mineral hydraulic oil pressure sensor for material testing machines
• 100mb leak testing dp transmitter with 1mb accuracy & 10bar overpressure rating
• Hydro power plant sea water high accuracy DP transmitter
• 36XW Digital Submersible Hydrostatic Level Sensor

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Accuracy Related Terms

More pages related to accuracy technical terms.

• BSL – Best Straight Line
• Compensated Temperature Range
• Digital Compensation
• g Effect
• High Accuracy
• Hysteresis
• LHR – Linearity, Hysteresis and Repeatability
• Long Term Stability/Drift
• NL – Non-Linearity
• PPM – Parts Per Million
• Precision
• Pressure Hysteresis
• Repeatability
• RTE – Referred Temperature Error
• Secondary Pressure Standard
• TEB – Temperature Error Band
• TEB – Total Error Band
• Temperature Compensation
• Temperature Error
• Thermal Hysteresis
• Threshold
• TSL – Terminal Straight Line
• TSS – Thermal Span or Sensitivity Shift
• TZS – Thermal Zero Shift