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1.3 Environment Condition for Equipment
Nov 21, 2020- Temperature
e.g: 20°C±2°C or 23°C±3°C
- Humidity
1.2 Accuracy of Measurement
Nov 20, 2020Instrument are calibrated to make them accurate within the manufacturer's specification. Accuracy is an essential factor in instrument performance. In instrument calibration "accuracy" has a special meaning.
- The closeness of the agreement between the result of a measurement and the the true value of the measurement.
A precise instrument will produce the same representation or output every time it receives an identical input.
Repeatability of measurement
The closeness of the agreement between the result of successive measurements of the same measurement carried out subjected to the following:
- Same method of measurement
- Same observer
- Same measuring instrument
- Same location
- Same condition of use
- Repetition over a short period of time
Reproducibility of measurement
The closeness of agreement between the result of measurements of the same measured, where the measurements are carried out under changed conditions such as:
- Principle or method of measurement
- Observer
- Measuring instrument
- Location
- Condition of use
- Time.
Error of measurement
The result of measurement minus the of the measurand.
Correction
The value which, added algebraically to the uncorrected result of a measurement, compensated for an assumed systematic error.
Uncertainty of measurement
At estimate characterising the range of values within the true value of measurand lies.
Traceability
The property of a result of a measurement whereby it can be related to appropriate standards, generally international or national standards.
All measuring equipment should be traceable to the National standards which are traceable to international standards.
1.1 The needs of Calibration
Nov 20, 2020- It is obvious that measurement is vital importance to determine and maintain quality.
- To produce quality measurement, one must make sure that the measuring equipment are properly maintained and regularly calibrated.
What is calibration?
- Calibration is the accurate measurement and comparison of an instrument's input and output to a known standard.
- Instrument error can be identified and corrected.
Why Calibrate?
Certain factor have to be considered before deciding and finalising whether an inspection or measuring instruments requires calibration or not.
- What are the tolerance/acceptance criteria?
- What is the level of accuracy does the measurement need to be?
- Does the outcome of the measurement decide the product acceptance/rejection?
The Importance of Recalibration
Instrument may require recalibration for a number of reasons:
- Overtime method, material, man, machine and environment condition can affect the instrument calibration.
- Calibration is usually necessary after any extended period of usage.
1.0 Introduction to Measurement
Nov 20, 2020In order to perform reliable measurement the user evidently should have proper measuring devices. In turn these measuring devices should be calibrated at regular intervals. To measure is one thing, to measure correctly is something entirely different. To obtain result a number of questions must be answered:
- What specific property is to be investigated?
- In what unit will it be measured? (The results of the measurement will be quantified in units, therefore using the right unit is essential.)
- The measurement method that will be used. (In this respect measurement procedure, error analysis and possible external influences could be importance.)
- The measurement setup. (Such a setup will always contain a standard, a measuring device and the instrument to be measured. For accurate measurements quality devices are required. To be able to determine whether a measuring device is in good condition, it is necessary to check it at regular intervals. )