Instrumentation Lab
Jordan University of Science and Technology
Faculty of Engineering
Mechanical Engineering Department
Title :Calibration of Instruments .
Course # :ME 472.
Dr : Mohammad Othman
Name : Afnan Rowhi al Bahlool .
Student number : 20080025118.
Objective : * Get familiar with the pressure gages, such as U tube manometer , deadweight and calibrate them with pressure gage . * Get familiar with some electrical instruments , such as the DC power supply, AC power supply (function generator ), digital and analog multi-meters . * Study how to calibrate these instruments. * study the hysteresis phenomena . Introduction : calibration is often regarded as including the process of adjusting the output or indication on a measurement instrument to agree with value of the applied standard, within a specified accuracy. Although the exact procedure may vary from product to product, the calibration process generally involves using the instrument to test samples of one or more known values called “calibrators Calibrations are performed using only a few calibrators to establish the correlation at specific points within the instrument’s operating range.
Calibration may be called for: * a new instrument * after an instrument has been repaired or modified * when a specified time period has elapsed * when a specified usage (operating hours) has elapsed * before and/or after a critical measurement * after an event, for example after an instrument has had a shock, vibration, or has been exposed to an adverse condition which potentially may have put it out of calibration or damage it sudden changes in weather * whenever observations appear questionable or instrument indications do not match the output of surrogate instruments * as specified by a requirement, e.g., customer specification, instrument manufacturer recommendation.
Hysteresis :
a delay in the response of an object to changes in the forces
Faculty of Engineering
Mechanical Engineering Department
Title :Calibration of Instruments .
Course # :ME 472.
Dr : Mohammad Othman
Name : Afnan Rowhi al Bahlool .
Student number : 20080025118.
Objective : * Get familiar with the pressure gages, such as U tube manometer , deadweight and calibrate them with pressure gage . * Get familiar with some electrical instruments , such as the DC power supply, AC power supply (function generator ), digital and analog multi-meters . * Study how to calibrate these instruments. * study the hysteresis phenomena . Introduction : calibration is often regarded as including the process of adjusting the output or indication on a measurement instrument to agree with value of the applied standard, within a specified accuracy. Although the exact procedure may vary from product to product, the calibration process generally involves using the instrument to test samples of one or more known values called “calibrators Calibrations are performed using only a few calibrators to establish the correlation at specific points within the instrument’s operating range.
Calibration may be called for: * a new instrument * after an instrument has been repaired or modified * when a specified time period has elapsed * when a specified usage (operating hours) has elapsed * before and/or after a critical measurement * after an event, for example after an instrument has had a shock, vibration, or has been exposed to an adverse condition which potentially may have put it out of calibration or damage it sudden changes in weather * whenever observations appear questionable or instrument indications do not match the output of surrogate instruments * as specified by a requirement, e.g., customer specification, instrument manufacturer recommendation.
Hysteresis :
a delay in the response of an object to changes in the forces
References: 1.http://www.aicompanies.com/index.cfm/ServiceandSupport/CalibrationExplained/What_is_Calibration 2.http://www.wisegeek.com/what-is-negative-pressure.htm 3. http://www.answers.com/topic/negative-pressure#ixzz2L0K64cWP 4. http://wiki.answers.com/Q/What_is_a_Dead_Weight_tester_in_instrumentation