Calibration involves comparing a known standard measurement to an unknown measurement from a unit under test to determine the unit's accuracy, repeatability, precision, and other characteristics. Calibration is important because measuring devices' accuracy degrades over time, and accurate devices improve product quality. A measuring device should be calibrated according to the manufacturer's recommendations, after any shocks, and periodically like annually or quarterly. The costs of an uncalibrated device's errors could outweigh calibration costs, so regular calibration is recommended.

1. Calibration
in simple words
By: Amir Sharifi

2.  What is Calibration
 Why calibration is important
 When you should calibrate measuring devices
 Does it worth expending money for it
Key Questions

3. Calibration is a comparison between a known
measurement (the standard) and an unknown
measurement (Unit Under Test) to find out
characteristic of the UUT like Accuracy, Repeatability,
Precision, Hysteresis, Zero drift, etc.
 Typically, the accuracy of the standard should be 10
times better than the accuracy of the measuring
device being tested. However, accuracy ratio of 3:1
is acceptable by most standards organizations.
 The standard should be traceable to national or
international standards (Traceability).
What is calibration

4. Some type of measuring devices
Tire Pressure Gauge
Food Thermometer
Tape Measure

5.  The accuracy of all measuring devices degrade over time.
 calibration improves the accuracy of the measuring device.
 Accurate measuring devices improve product quality.
Why calibration is important

6. Traceability

7. Pressure Calibration
Some kind of pressure calibrators

8. Temperature Calibration
Some kind of Temperature calibrators
Boiling and freezing points of water
(at sea level)

9. A measuring device should be calibrated:
 According to recommendation of the
manufacturer.
 After any mechanical or electrical shock.
 Periodically (annually, quarterly, monthly)
When a measuring device should
calibrate

10. Hidden costs and risks associated with the
un-calibrated measuring device could be
much higher than the cost of calibration.
Therefore, it is recommended that the
measuring instruments are calibrated
regularly by a reputable company to ensure
that errors associated with the
measurements are in the acceptable range.
Final Advice

11. Thanks for your time