Duration of time between two off-on edges of the test output device share by QR code
extreme value of measurement error, with respect to a known reference quantity value, permitted by specifications or regulations for a given measurement, measuring instrument or measuring system
Note: Usually, the term “maximum permissible errors” or “limits of errors” is used where there are two extreme values
ratio of the active power to the apparent power
Note: At sinusoidal and either one-phase or symmetrical three-phase conditions, the power factor = cos Φ = the cosine of the phase difference Φ between voltage U and current I.
ratio of the r.m.s. value of the harmonic content to the r.m.s. value of the fundamental term
Note 1: The harmonic content is obtained e.g. by subtracting from a non-sinusoidal alternating quantity its fundamental term.
Note 2: The distortion factor is usually expressed as a percentage. It is equivalent to THD, total harmonic distortion
internal connections of the meter, part of the measuring element and, in the case of static meters, part of the power supply, supplied with the voltage of the circuit to which the meter is connected
internal connections of the meter and part of the measuring element through which flows the current of the circuit to which the meter is connected
part of the meter that transforms a current and a voltage into a signal proportional to the power and or energy
meter in which current and voltage act on solid state (electronic) elements to produce an output proportional to the energy to be measured
meter intended for use by direct connection to the circuit(s) being measured, without the use of external device(s) such as instrument transformer(s)
instrument intended to measure electrical energy continuously by integrating power with respect to time and to store the result