# Glossary

#### Calibration

A set of operations, under specified environmental conditions, that establish the relationship between measured values of the equipment under test and the corresponding values of the reference standards or materials.

#### CMC

Calibration and Measurement Capability
The highest level of calibration or measurement accuracy available to a customer, provided by the calibration laboratory. Also known as Best Measurement Capabilities (BMC). Click here to view more about our CMC's.

#### Conductance

The measure of the ability of a material or solution to carry an electrical current. Unit of measure is the Siemens (S).

#### Confidence Interval

The range of values that encompases the standard uncertainty multiplied by the coverage factor. In the formula below, ± ks represents the confidence interval.

value = m ± ks

value = value of the measurement
m = measurement (or mean of measurements)
k = coverage factor
s = standard uncertainty

#### Coverage Factor

A numerical factor k is used as a multiplier of the combined standard uncertainty in order to obtain an expanded uncertainty. In general, the value of the coverage factor k is chosen on the basis of the desired level of confidence to be associated with a measurement. With a normal distribution, k=2 giving a level of confidence of approximately 95 % that the measured value m is within ± ks of the value.

value = m ± ks

value = value of the measurement
m = measurement (or mean of measurements)
k = coverage factor
s = standard uncertainty

#### Current

The rate of flow of electricity. The unit of measure is the ampere (A).