Rhe Essence Of Load Cell Calibration
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There are numerous instances of similarity of behavior among distinctly different classes of instruments. The similarity between the load cell and the D’Arsonval Movement, dating from 1882, is an example. A list of all factors affecting performance would be lengthy and also of doubtful value to the calibration. The effect of many of these factors can be minimized by good design, but they are not calibrated directly. They are indicators of performance, and the calibration of the instrument will include their effect, under the conditions existing at that time. By observance of good principal in design, craftsmanship in construction, and care in use, such an instrument may be made direct reading to perhaps 0.05 percent in static applications, and perhaps 2 percent in dynamic applications. To obtain this uncertainty, it is not necessary (or possible) to identify and calibrate separately each of the indicants. What is required is a calibration conditions. To take maximum advantage of the capabilities of the instrument, the user should be assured that the calibration process is consistent with the requirements of his particular application.

As an example, the usual D’Arsonval movement responds to the average value of a certified sine wave. Most users want an indication of the root mean squared value, so the instrument maker scribes the scale accordingly. Now the user need not worry as to why the matter will properly indicate the root mean squared value, although an understanding of why may save some embarrassment, but it is not required for the instrument to operate properly. As the waveform departs from a sinusoid, the indication will also departs from the calibration, and unless a proper instrument constant is determined, the user will again be subject to embarrassment. However, the instrument can be calibrated for this condition of use, but not until the user communicates with the calibrator.

The same situation exists in the application and calibration of a load cell / load cells. The user must have knowledge of its behavior under a particular set of conditions. General performance criteria may be established for load cells as a class of instruments and as a means of standardization. This, of course, is an economic consideration and one of ever increasing importance. The aero-space industry is of such diversity that it is altogether proper that the formulation and promulgation of standardized design and performance criteria be the responsibility of an organization such as the Instrument Society of America. Recommended practice guide for specifications and tests for Strain Gauge Force Transducers for Aero-Space Training of subcommittee 8A of ISA is representative of this, and the calibration data contained in the next article.

To be continued ….

To know more about load cell calibration and load cell amplifier please visit Tacuna Systems.


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