IEC 60728-3:2017 pdf download

IEC 60728-3:2017 pdf download.Cable networks for television signals, sound signals and interactive services Part 3: Active wideband equipment for cable networks
1 Scope
This part of IEC 60728 specifies the measuring methods, performance requirements and data publication requirements for active wideband equipment of cable networks for television signals, sound signals and interactive services. This document • applies to all amplifiers used in cable networks; • covers the frequency range 5 MHz to 3 000 MHz; NOTE The upper limit of 3 000 MHz is an example, but not a strict value. • applies to one-way and two-way equipment; • specifies the basic methods of measurement of the operational characteristics of the active equipment in order to assess the performance of this equipment; • identifies the performance specifications to be published by the manufacturers; • states the minimum performance requirements of certain parameters.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1 , Environmental testing – Part 1: General and guidance IEC 60068-2-1 , Environmental testing – Part 2-1: Tests – Tests A: Cold IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Tests B: Dry heat IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal) IEC 60068-2-1 4, Environmental testing – Part 2-14: Tests – Test N: Change of temperature IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test dB: Damp heat, cyclic (12 h + 12 h cycle) IEC 60068-2-31 , Environmental testing – Part 2-31: Tests – Test Ec: Rough handling shocks, primarily for equipment-type specimens IEC 60068-2-40, Basic environmental testing procedures – Part 2-40: Tests – Test Z/AM: Combined cold/low air pressure tests
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms, definitions, symbols and abbreviated terms apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 Terms and definitions 3.1 .1 amplitude frequency response gain or loss of an equipment or system plotted against frequency 3.1 .2 attenuation ratio of the input power to the output power of an equipment or system, usually expressed in decibels 3.1 .3 carrier-to-noise ratio difference in decibels between the vision or sound carrier level at a given point in an equipment or system and the noise level at that point (measured within a bandwidth appropriate to the television or radio system in use) 3.1 .4 composite intermodulation noise CIN sum of noise and intermodulation products from digital modulated signals
4 Methods of measurement
4.1 General This clause defines basic methods of measurement. Ensure that all test equipment is calibrated and all connectors, leads, and terminations have an adequate quality in order to not affect the test results. Unless stated otherwise, all measurements shall be carried out with 0 dB plug-in attenuators and equalisers. The position of variable controls used during the measurements shall be published. A network can be used to distribute terrestrial signals in addition to the signals received from satellites. The terrestrial antennas are connected to an optional terrestrial input port of a multi-switch. On each output port, the terrestrial signals are available in addition to the satellite IF signals. Since the normal frequency ranges for terrestrial signals and satellite IF signals do not overlap, both can be carried on the same cable.