Glossary

Calibration Executive 5.0 Help

Edition Date: June 2019

Part Number: 374564R-01

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Prefixes

Symbol Prefix Value
p pico 10 -12
n nano 10 -9
µ micro 10 -6
m milli 10 -3
k kilo 10 3
M mega 10 6
G giga 10 9
T tera 10 12

Numbers/Symbols

nV nanovolts 10-9 volts
µV microvolts 10-6 volts
µΩ microohms 10-6 ohms
mΩ milliohms 10-3 ohms
MΩ megaohms 106 ohms
pA picoamps 10-12 amperes
nA nanoamps 10-9 amperes
µA microamps 10-6 amperes
mA milliamps 10-3 amperes

A

adjustTo 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.

C

calibrationA 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 uncertaintyThe 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.
confidenceThe probability that a predicted result will occur.
confidence level Confidence, expressed either as a fraction (between 0 and 1) or a percentage.
coverage factorA numerical factor used as a multiplier of the standard uncertainty to obtain an expanded uncertainty.

D

degrees of freedomAny of the unrestricted, statistically independent values of a sample that are used to determine a property of the sample.
DLLDynamic-Link Library for Windows—libraries that link to a program and load at run time instead of being compiled into the program.
driverSoftware that controls specific hardware device such as a DAQ device or a GPIB interface board.
DUTDevice Under Test—the device you are calibrating.

E

expanded uncertaintyA 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.

G

GPIBGeneral Purpose Interface Bus—the standard bus used for controlling electronic instruments with a computer.

H

HTMLHyper Text Markup Language—a hypertext document format used on the Web.

I

IVIInterchangeable virtual Instrumentation—an advanced architecture for instrument drivers that includes features such as simulation and state caching.

M

MBMegabytes of memory.
MHzMegahertz

N

NI-VISAThe National Instruments implementation of the VISA standard—an interface-independent software that provides a unified programming interface for vXI, GPIB, and serial instruments.

R

resolutionThe smallest signal increment that can be detected by a measurement system. Resolution can be expressed in bits, proportions, digits, or percent of full scale.

S

SCXISignal Conditioning eXtensions for Instrumentation—the National Instruments product line for conditioning low-level signals within an external chassis near sensors.
standardAn instrument used in calibration such as a calibrator, DMM, or counter.
standard uncertaintyThe 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.

T

TestStandA 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.

U

uncertaintyAn estimate of the range of values about the measured value in which the accepted value is believed to lie.
uncertainty of measurementA 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.

V

verifyTo 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.

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