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On calibration the device could provide quality measurements and accuracy over measurements which is recorded through a typical tool. When the device is capable of holding an accuracy of over + or - 5% accuracy then your tool is trusted to be calibrated.
Internal calibration is a process used inside a system to make fine adjustments. It is commonly used in equipment and vehicles to maintain accuracy.
Calibration standards are used to record the accuracy of certain calibrations that are performed. The accuracy allows the user to find out how good the calibration was.
calibration of sensors to optimize sensor accuracy
Calibration is required to maintain the accuracy and reliability of instruments.
Compare reading against a calibrated item. There are calibration instruments and procedures for all measuring devices. Basically, these allow comparisons to known, and very well maintained, standards, usually in an indirect fashion.
The answer is all of them
Calibration equipment is equipment used to test the accuracy of other equipment, and make sure it is as accurate as it needs to be. If used on a set of bathroom scales, it might involve a set of weights that are known to weigh 20Kg, 30Kg, 40Kg, and so on. (These weights might be as much as 0.2Kg under or over weight, for example.) These would then be put on the scales, to make sure the scales gave a reading that was 20Kg, 30Kg 40Kg. For bath room-scales the 20Kg weight might produce a reading from 19 to 21Kg, which is plus or minus 5%, IE an error of 5%, with the "calibration weights" 1.25% accurate. For bathroom scales this would be "OK" Depending on what is being calibrated there would be a degree of error that would be allowed. For scales in a hospital measuring drugs a 5% error (perfectly OK on the scales in your bathroom) could result in a fatal overdose.
Usually, when you measure something that requires calibration, that work is generally considered important either monetarily or socially. So, you want to make sure you are sure because things are riding on your measurements. The short answer is so you don't screw up :)
Calibration services involve testing and fixing electronic and scientific instruments that have gradually lost accuracy over time. Calibration keeps these instruments up to date and allows for accurate measurements.
Erbium has a strong absorption in uv and visible range, It is used in HPlc calibration for the wavelength accuracy verification of the PDA detector.
If the meter is not calibrated, the measurements may be very wrong.