1、 ANSI/CEA Standard Set-top Box (STB) Power Measurement ANSI/CEA-2043 August 2013 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, f
2、acilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or no
3、nmember of CEA from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard
4、is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume
5、any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This document does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this document to establish appro
6、priate safety and health practices and to determine the applicability of regulatory limitations before its use. This document is copyrighted by the Consumer Electronics Association (CEA) and may not be reproduced, in whole or part, without written permission. Federal copyright law prohibits unauthor
7、ized reproduction of this document by any means. Organizations may obtain permission to reproduce a limited number of copies by entering into a license agreement. Requests to reproduce text, data, charts, figures or other material should be made to CEA. (Formulated under the cognizance of the CEA R4
8、 Video Systems Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2013 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email 2.1.2.4 IEC Central Office, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland; Phone +41 22 919 02 11; Fax +41 22 919 03 00; Internet htt
9、p:/www.iec.ch; Email pubinforiec.ch 3 Compliance Notation As used in this document “shall” and “must” denote mandatory provisions of the standard. “Should” denotes a provision that is recommended but not mandatory. “May” denotes a feature whose presence does not preclude compliance, and implementati
10、on of which is optional. “Optional” denotes items that may or may not be present in a compliant device. 4 Definitions 4.1 Auto Power-Down (APD) a STB feature that monitors parameters correlated with user activity or viewing. If the parameters collectively indicate that no user activity or viewing is
11、 occurring, the APD feature enables the STB to transition to SLEEP or OFF mode. 4.2 Client any device (e.g. STB, Thin-Client STB, Smart TV, Mobile Phone, Tablet, PC, etc.) that can receive content over a Home Network Interface. 4.3 Crest Factor the ratio of the peak to the root-mean-square (rms) cur
12、rent. 4.4 Digital Video Recorder (DVR) a STB feature that records television signals on a HDD or other non-volatile storage device. A DVR often includes features such as: Play, Record, Pause, Fast Forward (FF), and Fast Rewind (FR). STBs that support a Service Provider delivery network based “DVR” s
13、ervice are not considered DVR STBs for purposes of this standard. The presence of DVR functionality does not mean the device is defined to be an STB. 4.5 Display Device (DD) a Display Device (e.g. TV, Computer Monitor, Portable TV, etc.) receives its content directly from an STB through a video inte
14、rface (e.g. HDMI, Component, Composite, S-Video, etc.), not through a Home Network Interface, and renders it for viewing. 4.6 Harmonic a component of order n of the Fourier series that describes the periodic current or voltage (where n is an integer greater than 1). 4.7 High Definition Test Stream (
15、HD) video content delivered to the STB by the content provider to produce a minimum output resolution of 1280720 pixels in progressive scan mode at minimum frame rate of 59.94 fps (abbreviated 720p60) or a minimum output resolution of 19201080 pixels in interlaced scan mode at 29.97 fps (abbreviated
16、 1080i30). 4.8 Home Network Interface (HNI) the interface with external devices over a local area network (e.g. IEEE 802.11(Wi-Fi), MoCA, HPNA, IEEE 802.3, HomePlug AV). 4.9 Low Noise Block-downconverter (LNB) a combination of low-noise amplifier, block- downconverter and intermediate frequencies am
17、plifier. It takes the received microwave transmission, amplifies it, down-converts the block of frequencies down to a lower block of CEA-2043 3 intermediate frequencies where the signal can be amplified and fed to the indoor satellite TV STB using coaxial cable. 4.10 Outdoor Unit (ODU) the satellite
18、 signal reception components including; a receiving dish, one or more LNBs, and imbedded or independent radio frequency (RF) switches, used to distribute a satellite Service Provider network to consumer Satellite STBs. 4.11 Point of Deployment (POD) module a plug-in card that complies with the ANSI/
19、SCTE 28 interface and is inserted into a digital-cable-ready device to enable the decryption of services and provide other network control functions. 4.12 Power Mode a condition or state of a device that broadly characterizes its capabilities, power consumption, power indicator coding, and responsiv
20、eness to input. 4.13 Principal STB Function functions necessary for selecting (e.g. EPG), receiving, decoding, decompressing, or delivering video content to a Display Device, DVR, or Client. Monitoring for user or network requests is not considered a Principal STB Function. 4.14 Service Provider a b
21、usiness entity that provides video content, a delivery network, and associated installation and support services to subscribers with whom it has an ongoing contractual relationship. 4.15 Satellite STB a STB that receives and decodes video content as delivered from a Service Provider satellite networ
22、k. 4.16 Set-top Box (STB) a device whose primary purpose or function is to receive video content which is then delivered to a Display Device, recording device, or Client. 4.17 Smart Card a plug-in card that complies with ISO/IEC 7816-12 and is inserted into a satellite STB to enable the decryption o
23、f services and provide other network control functions. 4.18 Standard Definition Test Stream (SD) video content delivered to the STB by the content provider to produce an output resolution of 640 480 pixels in interlaced scan mode at minimum frame rate of 29.97 fps (abbreviated 480i30). 4.19 Thin-Cl
24、ient STB a STB that can receive content over a Home Network Interface from another STB, but is unable to interface directly to the Service Provider network. CEA-2043 4 5 Symbols and Abbreviations 5.1 AC alternating current 5.2 ANSI American National Standards Institute 5.3 EPA Environmental Protecti
25、on Agency 5.4 EPG electronic program guide 5.5 FPS (fps) frames per second 5.6 HDD hard disk drive 5.7 IEC International Electrotechnical Commission 5.8 IP Internet Protocol 5.9 ISO International Organization for Standardization 5.10 OTA over-the-air 5.11 RF radio frequency 5.12 RMS (rms) root-mean-
26、square 5.13 SCTE The Society of Cable Telecommunications Engineers. Inc. 5.14 UUT unit under test 5.15 W watts 6 Power Modes 6.1 ON The STB is connected to a mains power source. At least one Principal STB Function is activated and all Principal STB Functions are provisioned for use. The power consum
27、ption in ON mode may vary based on specific use and configuration. 6.2 SLEEP A range of reduced power states where the STB is connected to a mains power source and is not providing any Principal STB Function. The STB may transition to ON or OFF mode due to user action, internal signal, or external s
28、ignal. The power consumed in this mode may vary based on specific use or configuration. If any Principal STB Function is activated while operating in this mode, the STB is assumed to transition to ON mode. Monitoring for user or network requests is not considered a Principal STB Function. An STB may
29、 be expected to transition from SLEEP mode to ON mode within a specified time interval however such considerations are outside the scope of this standard. 6.3 OFF The STB is connected to a mains power source, has been de-activated, and is not providing any function. The STB requires a user action to
30、 transition from this mode to ON or SLEEP mode. Note: SLEEP and OFF modes may not be available on all STBs. 7 Measurement Criteria 7.1 General Measurements shall be made under the test conditions specified and with the equipment specified. 7.2 Measurement Accuracy Power measurements of 0.5 W or grea
31、ter shall be made with an uncertainty of less than or equal to 2% at the 95% confidence level. Power measurements of less than 0.5 W shall be made with CEA-2043 5 an uncertainty of less than or equal to 0.01 W at the 95% confidence level. The power measurement instrument shall have a resolution of (
32、a) 0.01 W or better for power measurements of 10 W or less; (b) 0.1 W or better for power measurements of greater than 10 W and up to 100 W; and (c) 1 W or better for power measurements of greater than 100 W. For equipment connected to more than one phase, the power measurement instrument shall be e
33、quipped to measure the total power of all of the phases connected. Note: For more information about determining uncertainty of measurement, refer to Annex D of IEC 62301. 7.3 Test room Tests shall be carried out in a room where the air speed surrounding the unit under test (UUT) is = 0.5 m/s, and th
34、e ambient temperature is maintained at 23 5 C throughout the test. Test voltage An AC power source shall be used to provide the UUT with an input voltage of 115 V 1% and a frequency of 60 Hz 1%. The total harmonic distortion of the supply voltage when supplying the UUT in the specified mode shall no
35、t exceed 2%, up to and including the 13th harmonic. The peak value of the test voltage shall be between 1.34 and 1.49 times its root-mean-square (rms) value. 7.4 Test Equipment The following should be considered when selecting test equipment: (a) An oscilloscope with a current probe to monitor ac li
36、ne current waveform, amplitude, and frequency; (b) A true rms voltmeter to verify voltage at the input of the UUT; and (c) A frequency counter to verify frequency at the input of the UUT. Note: Items (a) and (b) may be considered optional when the ac source output has sufficient accuracy. 7.4.1 Cali
37、bration Test instruments shall be calibrated annually to traceable national standards to ensure that the limits of error in measurement are not greater than 0.5% of the measured value over the required bandwidth of the output. 7.4.2 True Power Wattmeter 7.4.2.1 Crest factor A true power wattmeter sh
38、all be used and shall have (a) Accuracy and resolution in accordance with section 7.2; (b) Sufficient bandwidth; and (c) A crest factor rating that is appropriate for the waveforms being measured and capable of reading the available current waveform without clipping the waveform. The peak of the cur
39、rent waveform measured during SLEEP and ON modes for the UUT shall be used to determine the crest factor rating and the current range setting. The full-scale value of the selected current range multiplied by the crest factor for that range shall be at least 15% greater than the peak current to preve
40、nt measurement error. 7.4.2.2 Bandwidth The current and voltage signal shall be analyzed to determine the highest frequency component (i.e., harmonic) with a magnitude greater than 1% of the fundamental frequency under the test conditions. The minimum bandwidth of the test instruments shall be deter
41、mined by the highest frequency component of the signal. 7.4.2.3 Frequency response A wattmeter with a frequency response of at least 3 kHz shall be used in order to account for harmonics up to the 50th harmonic. CEA-2043 6 7.4.2.4 Sampling Interval The wattmeter shall be capable of sampling at inter
42、vals less than or equal to 1 s. Note: Electronic equipment can cause harmonic waveforms that lead to inaccuracies in power measurements. 8 Test Procedures 8.1 General 8.1.1 Power levels SHALL be measured in accordance with the following steps: (a) Ensure that the supplied ac power source is in accor
43、dance with section 0 (b) Apply power to all test equipment (c) Apply power to the UUT (d) Ensure that the UUT is configured as required in 8.1.14 (e) Allow the UUT to operate in ON mode while receiving and decoding video at least 15 minutes so the UUT can achieve a stable condition. 8.1.2 Calculatio
44、n of Average Power Consumption For all tests in ON, SLEEP, and OFF modes, the average power shall be calculated using one of the following two methods: (a) Record the accumulated energy (E) in kilo-watt hours (kWh) consumed over the time period specified for each test (T). The average power consumpt
45、ion is calculated as P = E/T. (b) Record the average power consumption (P) by sampling the power at a rate of at least 1 sample per second and computing the arithmetic mean of all samples over the time period specified for each test (T). (c) The method used must be recorded by the tester. 8.1.3 All
46、tests SHALL use source test streams that match the output capability of the UUT (a) HD output capable STBs SHALL use the HD Test Stream (section 4.7) (b) SD output capable STBs SHALL use the SD Test Stream (section 4.18) (c) An entity requesting the use of CEA-2043 may specify the use of additional
47、test streams however the specification of these streams is outside the scope of this standard. 8.1.4 STB Test Coverage This standard contains a multiplicity of tests and test configurations. It is not expected that any particular product would be subject to all tests and test configurations. Decisio
48、ns on which tests and test configurations to apply to any particular product are outside the scope of this standard. 8.1.5 STB configurations that require a home network STB configurations that require the use of a home network shall use the Home Network Interface option (HNI) as provided by the ent
49、ity specifying the use of CEA-2043. The HNI option used for the testing must be recorded by the tester. 8.1.6 STBs requiring additional data connections All data connections required for operation of Principal Functions must be connected. Data connection performance criteria (i.e. download speed, upload speed, latency, etc.) must meet the specified requirements of the UUT to fulfill the principal functions. 8.1.7 STBs Requiring a Subscription Service For STBs that require a servic
