Detail of GB 24850-2020

Introduction of GB 24850-2020

Minimum allowable values of energy efficiency and energy efficiency grades for flat panel televisions and set-top boxes 1 Scope This standard specifies the energy efficiency grades, minimum allowable values of energy efficiency, energy efficiency calculation and test method of flat panel televisions and set-top boxes (also called "digital TV receiver"). This standard is applicable to LCD televisions and organic light-emitting diode televisions (hereinafter referred to as " flat panel televisions"), which work normally at AC 220 V and 50 Hz power supply, and have the main functions of receiving, demodulating and displaying ground, cable, satellite or other analog and digital signals. It is also applicable to LCD and organic light-emitting diode display devices, whose main functions are TVs and do not have tuners, but are circulated as TV products. This standard is applicable to set-top boxes that work normally at AC 220 V and 50 Hz power supply, including cable set-top boxes, terrestrial set-top boxes, satellite set-top boxes and network set-top boxes. This standard is not applicable to direct broadcast satellite set-top boxes. 2 Normative References The following referenced documents are indispensable for the application 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. GB3174 Characteristics of PAL-D television broadcasting system GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values GB/T 14857 The specifications of encoding parameters of digital television for studio GB/T 17309.1 Methods of measurement on receivers for television broadcast transmissions Part 1: General considerations Electrical measurements at radio and video frequencies and measurements on displays GB/T17700 Channel coding and modulation STANDARD for Digital Video Broadcasting-Satellite (DVB-S) GB/T 17975.1 Information technology - Generic coding of moving pictures and associated audio information - Part 1: Systems GB/T 17975.2 Information technology-Generic coding of moving picture and associated audio information - Part 2: Video GB/T 17975.3 Information technology-Generic coding of moving picture and associated audio information - Part 3: Audio GB20600 Framing structure, channel coding and modulation for digital television terrestrial broadcasting system GB20943 Minimum allowable values of energy efficiency and evaluating values of energy conservation for single voltage external AC-DC and AC-AC power supplies GY/T 155 Video parameter values for the HDTV standard for production and programme exchange GY/T 170 Specification of framing structure channel coding and modulation for digital cable broadcasting system SJ/T 11324 Terminology of digital television receiving equipment IEC 62087-2:2015 Audio, video, and related equipment - Determination of power consumption - Part 2: Signals and media 3 Terms and definitions For the purposes of this document, the terms and definitions in SJ/T 11324 as well as the followings apply. 3.1 on mode flat panel television is connected to the power supply and generates the main functions such as sound and image set-top box is connected with power supply, realizing the main functions such as receiving, demodulating, decoding and outputting audio and video programs 3.2 passive standby mode flat panel television is connected to the power supply, generating neither sound nor image, but can be switched to the on mode through remote control or other external signals low power mode, set-top box is connected to the power supply, providing no main functions Note: the set-top box can enter this mode only after receiving external excitation signals from remote control and buttons, etc. Set-top box can return to on mode from this mode by excitation of remote control device and internal signal. 3.3 passive standby power active power of flat panel television and set-top box measured in passive standby mode, under the test method specified in this standard   3.4 on mode static power for flat panel televisions active power measured when the flat panel television plays static test images in the on mode, under the test method specified in this standard 3.5 on mode dynamic power for flat panel televisions active power measured when the flat panel television plays dynamic test signals in the on mode, under the test method specified in this standard 3.6 on mode power for flat panel televisions active power used to calculate and evaluate the energy efficiency of flat panel television Note: The startup power of flat panel television is chosen from the static power and dynamic power, see 6.2. 3.7 fluctuation values of power for flat panel televisions ratio of the absolute value of the difference between startup static power and startup dynamic power to the startup static power 3.8 minimum allowable values of energy efficiency for flat panel televisions minimum energy efficiency value and the maximum passive standby power value allowed by flat panel televisions under the test method specified in this standard 3.9 minimum allowable values of energy efficiency for set-top boxes maximum power value of the set-top box under the on mode and passive standby mode allowed by set-top boxes under the test method specified in this standard

Contents of GB 24850-2020