FUTEK VCal Sensor Verification - Manual (Page 59)

Futek Advanced Sensor Technology – Futek VCal™Documentation Rev. 1.8.0 07/26/05
©Futek Advanced Sensor Technology 2005 59
A2LA The American Association for Laboratory Accreditation. ( http://www. a2la2.net )
Accuracy Stated as a limit tolerance which defines the average deviation between the actual output versus theoretical output. In practical
transducer applications, the potential errors of nonlinearity, hysteresis, nonrepeatability and temperature effects do not normally occur
simultaneously, nor are they necessarily additive. Therefore, accuracy is calculated based upon the RMS value of potential errors, assuming a
temperature band of ± 10° F, full rated load applied, and proper set up and calibration. Potential errors of the readout, crosstalk, or creep
effects are not included.
ANSI The American National Standards Institute. ( http://www.ansi.org )
ASTM The American Society for Testing and Materials. ( http://www.astm.org )
Audit Trail The chronological set of records that provides evidence of system activity. These records can be used to reconstruct, review and
examine transactions from inception to output of final results. The records can also be used to track the calibration history of a reference sensor
back to it’s original calibration (generally with NIST calibrated dead weights).
Average to Best Fit Output The average of the standard deviations between the individual measured outputs and the Best-Fit Outputs for each
load point.
Axial Load A load applied along a line concentric with the Primary Axis.
Best Fit Equation The equation of a straight line, calculated from a set of measurement results, which attempts to minimize the differences
(usually called residuals) between the line and the measurement results. There is more than one statistical method used, each of which may place
the straight line in a slightly different position with respect to the measurement data.
Calibration Certificate For the purposes of this Glossary; A document which lists all of the information relevant to a Calibration (Customer info,
Sensor info, Test Conditions, Test Results, etc.), and certifies that the information is accurate within a certain limit of uncertainty.
Calibration Curve A record of the comparison of the transducer outputs versus standard test loads.
Calibration Interval A period of time or amount of use between calibrations determined to be adequate to ensure equipment remains reliable,
where reliable is defined as within sufficient tolerance (or uncertainty) for the tests being done.
Calibration Load For the purposes of this Glossary; The maximum load which is to be applied during a particular Calibration.
Calibration The comparison of transducer outputs against standard test loads.
. Compensated Temperature The range of temperature over which the transducer is compensated to maintain Rated Output and Zero Balance
within specified limits.
. Correction Factor Numerical factor by which the uncorrected result of a measurement is multiplied to compensate for systematic error.
Creep The change in transducer output occurring with time, while under load, and with all environmental conditions and other variables remaining
constant. Usually measured with Rated Load applied and expressed as a percent of Rated Output over a specific period of time.
Crosstalk With one component loaded to capacity, and the other unloaded, the output of the unloaded component will not exceed the percentage
specified of its full-scale capacity. .
Deflection The change in length along the Primary Axis of the load cell between no-load and Rated Load conditions.
Drift A random change in Output under constant Load conditions.
VII. Futek VCal™Glossary of Terminology