IEC 60688 pdf download – Electrical measuring transducers for converting a.c. electrical quantities to analogue or digital signals

IEC 60688 pdf download – Electrical measuring transducers for converting a.c. electrical quantities to analogue or digital signals
2Normative references
The following referenced documents are indispensable for the application of this document. Fordated references,only the edition cited applies.For undated references, the latest edition ofthe referenced document (including any amendments) applies.
IEC 60050(301,302，303):1983,International Electrotechnical Vocabulary (IEV).Chapter 301:General terms on measurements in electricity.Chapter 302: Electrical measuring instruments.Chapter 303: Electronic measuring instruments
IEC 60051-1:1997,Direct acting indicating analogue electrical measuring instruments and theiraccessories – Part 1: Definitions and general requirements common to all parts
IEC 60068-2-3:1985,Environmental testing – Part 2:Tests -Test Ca: Damp heat,steady state
IEC 60255-4*:1976,Electrical relays – Part 4: Single input energizing quantity measuring relayswith dependent specified time
IEC 60521:1988,Class 0,5,1 and 2 alternating-current watt-hour meters
IEC 61000-4,Electromagnetic compatibility(EMC) – Part 4:Testing and measuring techniques
IEC 61010-1:2001,Safety requirements for electrical equipment for measurement, control andlaboratory use – Part 1: General requirements
NOTE Refer to annex A for the list of informative references.
3Definitions
For the purpose of this International Standard the following definitions apply:3.1 General terms
3.1.1
electrical measuring transducer (hereinafter designated “transducer”)
a device for converting an a.c. measurand to a direct current, a direct voltage or a digital signalfor measurement purposes
3.1.2
auxiliary supply
an a.c. or d.c. electrical supply,other than the measurand,which is necessary for the correctoperation of the transducer
3.1.3
auxiliary circuit
a circuit which is usually energized by the auxiliary supply.
NOTE The auxiliary circuit is sometimes energized by one of the input quantities.
3.1.4
transducer with offset zero (live zero)
a transducer which gives a predetermined output signal other than zero when the measurandis zero
3.1.5
transducer with suppressed zero
a transducer for which zero output signal corresponds to a measurand greater than zero
3.1.6
distortion factor
the ratio of the r.m.s. value of the harmonic content to the r.m.s. value of the non-sinusoidalquantity
3.1.7
output load (for analogue signals only)
the total resistance of the circuits and apparatus connected externally across the outputterminals of the transducer
3.1.8
ripple content (of an analogue output signal)
with steady-state input conditions,the ratio of the peak-to-peak value of the fluctuatingcomponent of an analogue output signal, expressed in percentage, to the fiducial value
3.1.9
output signal
an analogue or digital representation of the measurand
3.1.10
output power
the power at the transducer output terminals
3.1.11
output current (voltage) (for analogue signals only)
the current (voltage) produced by the transducer which is an analogue function of themeasurand
3.1.12
reversible output current (voltage)(for analogue signals only)
an output current (voltage) which reverses polarity in response to a change of sign ordirection of the measurand
3.1.13
measuring element of a transducer
a unit or module of a transducer which converts the measurand, or part of the measurand, intoa corresponding signal.
3.1.14
single element transducer
a transducer having one measuring element