|adjust||To correct the measurement error of a device by adjusting the calibration constants and storing the new calibration constants in the EEPROM. The host computer reads the calibration constants and the software uses them to compensate for errors in the data and to present calibrated data to the user.|
|calibration||A set of operations that compares the values indicated by a measuring instrument or measuring system to the corresponding values realized by external standards. The result of a calibration can be used to determine the measurement error and can correct for it in the adjustment process.|
|combined standard uncertainty||The standard uncertainty of the result of a measurement when that result is obtained from the values of a number of other quantities, equal to the positive square root of a sum of terms, the terms being the variances or covariances of these other quantities weighted according to how the measurement result varies with changes in these quantities.|
|confidence||The probability that a predicted result will occur.|
|confidence level ||Confidence, expressed either as a fraction (between 0 and 1) or a percentage.|
|coverage factor||A numerical factor used as a multiplier of the standard uncertainty to obtain an expanded uncertainty.|
|degrees of freedom||Any of the unrestricted, statistically independent values of a sample that are used to determine a property of the sample.|
|DLL||Dynamic-Link Library for Windows—libraries that link to a program and load at run time instead of being compiled into the program.|
|driver||Software that controls specific hardware device such as a DAQ device or a GPIB interface board.|
|DUT||Device Under Test—the device you are calibrating.|
|expanded uncertainty||A quantity defining an interval about the result of a measurement that may be expected to encompass a large fraction of the distribution of values that could reasonably be attributed to the quantity being measured.|
|GPIB||General Purpose Interface Bus—the standard bus used for controlling electronic instruments with a computer.|
|HTML||Hyper Text Markup Language—a hypertext document format used on the Web.
|IVI||Interchangeable virtual Instrumentation—an advanced architecture for instrument drivers that includes features such as simulation and state caching.|
|MB||Megabytes of memory.|
|NI-VISA||The National Instruments implementation of the VISA standard—an interface-independent software that provides a unified programming interface for vXI, GPIB, and serial instruments.|
|resolution||The smallest signal increment that can be detected by a measurement system. Resolution can be expressed in bits, proportions, digits, or percent of full scale.|
|SCXI||Signal Conditioning eXtensions for Instrumentation—the National Instruments product line for conditioning low-level signals within an external chassis near sensors.|
|standard||An instrument used in calibration such as a calibrator, DMM, or counter.|
|standard uncertainty||The uncertainty of the result of a measurement expressed as a standard deviation.|
|structured query language (SQL)||An industry-standard language for retrieving, updating, and managing data.
|TestStand||A test executive program that allows you to organize and execute sequences of reusable test modules. In Calibration Executive, TestStand manages the calibration procedures used to calibrate a device.|
|Type A evaluation (of uncertainty)|| A method of evaluation of uncertainty by the statistical
analysis of a series of observations.
|Type B evaluation (of uncertainty)||A method of evaluation of uncertainty by means other
than the statistical analysis of a series of observations.
|uncertainty||An estimate of the range of values about the measured value in which the accepted value is believed to lie.|
|uncertainty of measurement||A parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the quantity being measured.|
|verify||To compare the measured performance of a device to an external standard of known measurement uncertainty to confirm that the device meets or exceeds its specifications.|