Calibration involves determining the relationship of the readings of a measurement instrument or system to the units that are applicable in a certain system of measuring. For accurate measurements, or output from equipment, it is necessary to compare them against a standard that has been proven accurate. Calibration is designed to compare measurements between known and unknown values. The standard is a piece of apparatus or equipment with an accuracy that can be determined or known. Standards can vary depending on which industry you are in. It is essential to know exactly what and how calibration is done.
Consider, for example, a digital temperaturemeter with an external probe. A digital thermometer is fitted with a test tool and an electric current corresponding to that temperature is then applied. The thermometer’s calibration is determined by recording the result. The International Bureau of Weights and Measures, or BIPM, defines calibration in this way: “Operation where, under specific conditions, a ratio is established between the quantities with measurement errors provided by standard measurement and corresponding measurements with associated uncertainty (of the calibrated tool or secondary reference) and, a second stage, the information is used to establish a rapport for obtaining a reading from an indication. This definition says that calibration is simply a comparison. It also introduces measurement uncertainty when comparing the accuracy of a device and a standard. Calibration Techniques Calibration techniques can be manual or automated, depending on the calibrated device. Manual The user performs this complex procedure. It is important to have a complete understanding of the system being calibrated or the equipment in order for the process to be accurate and without error. * Automatic Automatic calibrators are used to achieve automatic calibration. These automatic calibrators include a controller unit which houses the electronics. There are different formats available for calibration sessions.
Method # 2: Review and grade the work together
Method #3- Review with the agents Calibration Concept Calibration is fundamentally a comparison process. The standard used for calibration is either an instrument that is being measured or one that is being measured. This result is then compared to the following: the standard value, its uncertainty and the performance specification required by customers. Details are important, even though the concept is straightforward. Details such as: The measurement standard’s assigned value, which can be determined from the calibration history.
This uncertainty is derived from historical reports and internal statistical processes control methods used by many laboratories to calibrate their measurement systems.
Temperature and relative humidity are important factors to consider when calibrating. * The equipment and methods used to compare. *
The measurement uncertainty in relation to published performance specifications or customer requirements.
Importance of Calibration The calibration process is used to measure the accuracy and range of a measurement parameter. It is essential for processes such as testing, quality assurance and manufacturing. *
In some way, the accuracy of measuring tools will degrade. Track these changes in accuracy, and take steps to ensure that they do not affect the quality of your final product. *
Equipment that is based on certain technologies and measures variables like humidity, pressure, temperature, etc., are more susceptible to a ‘drifting’ of accuracy. *
You should ensure that your instrument operates within a range of acceptable error in situations where quality is important. *
It is vital to regularly calibrate your instruments to guarantee that you can have confidence in their measurements and output.
Factors That Affect Calibration *
Calibrator Tolerance – It’s important to only use calibrators that have been formulated by a manufacturer with tight tolerance specifications. Tolerance can influence the value of the calibrator. *
Effects of Ambient Temperature- It is essential to calibrate instruments at temperatures close to those at which they will be used. The ambient temperature can introduce errors into the test results that are not readily apparent. Overall, calibration ensures the accuracy of your equipment’s measurements. A reference standard is used to compare the calibration performance of all equipment. This ensures accurate measurements. It is important to calibrate your instruments periodically and to determine any “drift” that may be occurring in your measurements.
