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SJ/T 11346-2015 PDF English


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SJ/T 11346-2015: PDF in English (SJT 11346-2015)

SJ/T 11346-2015 ELECTRONICS INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 33.160.25 M 74 Filing No.: 52000-2015 Replacing SJ/T 11346-2006 Methods of measurement for electronic projectors ISSUED ON: OCTOBER 10, 2015 IMPLEMENTED ON: APRIL 01, 2016 Issued by: Industry and Information Technology of PRC Table of Contents Foreword ... 4  1 Scope ... 6  2 Normative references ... 6  3 Terms, definitions, abbreviations ... 7  3.1 Terms and definitions ... 7  3.2 Abbreviations ... 8  4 General requirements for measurement ... 8  4.1 General description ... 8  4.2 Performance measurement conditions ... 8  4.3 Measuring instruments ... 9  4.4 Video test signal ... 10  4.5 Adjustment before measurement ... 12  4.6 Adjustment of standard operating state ... 13  5 Measurement method of normal temperature performance ... 14  5.1 Correlated color temperature ... 14  5.2 Luminance output ... 14  5.3 Illuminance uniformity ... 15  5.4 Contrast ... 16  5.5 Ratio of allwhite and allblack ... 16  5.6 Inherent resolution ... 17  5.7 Definition ... 17  5.8 Input format compatibility ... 18  5.9 Focusing distance and image size ... 18  5.10 Chromaticity error ... 19  5.11 Non-uniformity of primary color chromaticity ... 19  5.12 Non-uniformity of white chromaticity ... 20  5.13 Color gamut coverage ... 21  5.14 White balance error ... 21  5.15 Operating noise ... 22  5.16 Coincidence error ... 22  5.17 Pixel defect points ... 23  5.18 Trapezoid correction capability ... 24  5.19 Projection distance at the projected image area 2 m2 ... 24  5.20 Power consumption of whole machine ... 25  5.21 Passive standby power ... 25  5.22 Grid power adaptability ... 26  5.23 Remote control distance ... 27  5.24 Controlled angle ... 27  5.25 Mass of whole machine ... 27  5.26 Color light output ... 28  Appendix A (Informative) Conversion method between CIE1976 uniform color space and CIE1931 color space ... 29  Methods of measurement for electronic projectors 1 Scope This standard specifies the terms and definitions, measurement conditions, measurement items, measurement methods, measurement results expression, etc., of electronic projectors. This standard applies to electronic projection type fixed resolution projectors (hereinafter referred to as projectors), including liquid crystal display (LCD) projectors, liquid crystal on silicon (LCoS) projectors, digital light processing (DLP) projectors, etc. Other projection methods and electronic projectors, which are used in different occasions, can be implemented with reference to it. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB 3174 PAL-D system TV broadcasting technical specification GB/T 6882 Acoustics - Determination of sound power levels of noise sources using pressure - Precision methods for anechoic and hemi-anechoic rooms GB/T 7921 Uniform color space and color difference formula GB/T 14857 The specifications of encoding parameters of digital television for studio GB/T 15644 Application of connectors for the interconnection of equipment in audio-visual systems GB/T 17953 Interfaces for 4:2:2 digital component video signals GB/T 26270-2010 Standard test signals for digital television receiving equipment SJ/T 11324 Terminology of digital television receiving equipment SJ/T 11329 Specification of interfaces for digital television receiving equipment - Part 3: Video interface of composite video blanking synchronization under standard operating conditions. 3.1.4 Passive standby mode The lower power mode, at which the projector is connected to mains power BUT does not provide primary functions. The projector can only enter this state, after receiving external excitation signals, such as remote control and buttons. The projector can be returned to the working state from this mode, by the activation of the remote control device, internal signal, etc. 3.1.5 Color light output The light output value, which is measured by a projector, when reproducing a color image. It is a performance indicator, that measures the ability of a color projector to reproduce primary color signals. 3.2 Abbreviations The following abbreviations apply to this document: CCT: Correlated colour temperature CIE: Commission internationale de L' Eclairage (fr) DLP: Digital light process LCD: Liquid crystal display LCoS: Liquid crystal on silicon 4 General requirements for measurement 4.1 General description Unless otherwise specified, the voltage values, which are given in this standard, are valid values. 4.2 Performance measurement conditions 4.2.1 Environmental conditions Unless otherwise specified, the following measurements are made, under standard atmospheric conditions: - Ambient temperature: 15 °C ~ 35 °C, preferably 25 °C; - Relative humidity: 25% ~ 75%; - Air pressure: 86 kPa ~ 106 kPa. 4.2.2 Power condition The power conditions are as follows: - Power supply voltage: AC 209 V ~ 231 V; - Power frequency: 49 Hz ~ 51 Hz; - Harmonic component: ±5%. 4.2.3 Measurement conditions The measurement conditions are as follows: a) The measurement shall be carried out in a dark room, where the stray illumination is less than or equal to 0.5 lx; b) The measurement shall use the matching lens of the projector; c) The room volume shall be able to meet the requirements for screen size, which is given by the projector. 4.3 Measuring instruments 4.3.1 Illuminometer The illuminometer requirements are as follows: a) Illuminance measurement range: 0.1 lx ~ 50000 lx: b) Illuminance measurement accuracy: ±2% (0.1 lx ~ 10 lx), ±5% (10 lx ~ 50000 lx): c) Chromatic values can be measured: u', v' or x, y; d) Chromatic measurement accuracy: ±0.002. Note: Please refer to Appendix A, for the conversion formula of (u', v') and (x, y). 4.3.2 Video signal generator The test signal diagram shall have the following types: - A1: Limit eight grayscale signal; - A2: Color bar signal; - A3: All-white field signal and all-black field signal; -A4: Location map of uniformity test points; - A5: Black and white window signal; - A6: Single pixel signal; - A7: Composite test diagram; - A8: All-red field, all-green field, all-blue field signals; - A9: White window signal; - A10: All-white field, all-grey field and all-black field signals with areas A and B; - A11: All-red field, all-green field, all-blue field signals with areas and A areas B; - A12: Red, green, blue three primary color matrix test signal. 4.4.2 Extreme eight grayscale signal See 5.5 in GB/T 26270-2010, for the description and examples of test diagram. 4.4.3 Color bar signal See 5.3 in GB/T 26270-2010, for the description and examples of test diagram. 4.4.4 All-white field signal and all-black field signal See 5.4 in GB/T 26270-2010, for the description and examples of test diagram. 4.4.5 Location map of uniformity test points See Figure D.2 in GB/T 26270-2010, for the description and examples of test diagram. 4.4.6 Black and white window signal See 5.8 in GB/T 26270-2010, for the description and examples of test diagram. 4.4.7 Single pixel signal See 5.20 in GB/T 26270-2010, for the description and examples of test diagram. standard operating state of the projector; e) Repeat steps c) and d), if necessary; f) During the whole measurement process, if the input signal is re-adjusted or replaced, it shall make the product operate stably for at least 5 minutes; then make measurement; g) The audio channel is not connected to the audio signal; if there is any audio output volume adjustment, set it to the minimum position; h) This state is the standard operating state, which remains unchanged, during the whole measurement process. Record the relevant settings and projector state, in the test record. 5 Measurement method of normal temperature performance 5.1 Correlated color temperature 5.1.1 Overview This clause is to measure the correlated color temperature (CCT) of the projector, under standard operating state. 5.1.2 Measurement steps a) Adjust the projector to the standard operating state, which is specified in 4.6; b) Input the all-white field signal; use a colorimeter, to measure the correlated color temperature (CCT) of the center point of the projection surface, wherein the center point is the P5 point of the position map of uniformity test points. 5.1.3 Presentation of measurement results Measurement results are expressed in Kelvin (K). 5.2 Luminance output 5.2.1 Overview This clause specifies the measurement of the luminance output of the projector, under standard operating state. 5.2.2 Measurement steps displayed image. Record the scale value, which is corresponding to the wedge- shaped line, in the horizontal and vertical directions of the projector. At this time, it shall record the reproduction rate of the image, at the same time. 5.7.3 Presentation of measurement results The measurement results are represented by TV lines. 5.8 Input format compatibility 5.8.1 Overview This clause specifies the measurement of the playback capability of the projector, to different input signal formats, under standard operating states. 5.8.2 Measurement steps Change the input signal format. Then measure the limit of the corresponding human eye distinguishable horizontal sharpness line, according to 5.7. If the measurement result is basically unchanged, it means that the input signal format is compatible. For downward compatibility, it is allowed to reduce the horizontal line of sharpness that is distinguishable by the human eye. 5.8.3 Presentation of measurement results List all compatible formats. 5.9 Focusing distance and image size 5.9.1 Overview This clause specifies the measurement of the closest projection distance, the minimum projection area, the farthest projection distance, the maximum projection area, that the projector can image clearly. The projection distance is the vertical distance, from the center point of the outermost layer of the projector lens to the projection screen. For reflective projectors, this is measured in accordance with the method, which is specified in the product specification. 5.9.2 Measurement steps a) Use a composite test diagram. Place the projector at the closest projection distance and minimum projection area. Adjust the focus distance, to make the image clear. Then measure and record the projection distance and projection diagonal size, at this time; b) Input the white window signal; change the level of the window signal, from 20% to 90%, in steps of 10%, to measure the color coordinates u' and v', at the center of the white window. 5.14.3 Presentation of measurement results The measurement results are expressed as the differences Δu' and Δv', between the chromaticity coordinates of each level and the chromaticity coordinates at 50% gray level. 5.15 Operating noise 5.15.1 Overview This clause specifies the measurement of the human eye's audible noise, which is emitted by the projector, under standard operating state. 5.15.2 Measurement steps a) Input 100% color bar signal to the projector, to let it work for 15 minutes. Make measurements, according to the relevant provisions of GB/T 6882. Add the A- weighting network to the measurement; b) The measurement distance is 1 m, in the normal direction of the center point of the upper, lower, left, right, front, rear surfaces. Where there is a dispute, place the projector in an ambient temperature of 23 °C ± 2 °C, for testing. 5.15.3 Presentation of measurement results The operating noise is the average value of the sound pressure level, in the operating noise of the 6 surfaces, expressed in decibels [dB(A)]. 5.16 Coincidence error 5.16.1 Overview This clause specifies the measurement of the degree to which the three-primary color pixels of the projector are finally combined into one point after projection. 5.16.2 Measurement steps a) Adjust the projector to the standard operating state, which is specified in 4.6; b) Input a single-pixel signal. Use a magnifying glass, to observe the coincidence diagram; calculate the number of non-red pixels, in areas A and B; record them; e) Under the standard operating state of the projector, input the all-green field test diagram; calculate the number of non-green pixels, in areas A and B; record them; f) Under the standard operating state of the projector, input the all-blue field test diagram; calculate the number of non-blue pixels, in areas A and B; record them. 5.17.3 Presentation of measurement results The measurement result is the statistic total number of defect points in area A and that total number of defect points in area B. 5.18 Trapezoid correction capability 5.18.1 Overview This clause specifies the measurement of the maximum elevation angle of the projector, when it is placed horizontally, under standard operating states. 5.18.2 Measurement steps Input the composite test diagram. Use an angle ruler, to measure the angle, between the center line of the projection beam and the vertical line of the projector, which faces the screen, expressed in degrees. Within the range below this included angle, the projector can display a basic rectangle, that is, the deviation between the upper and lower side lengths is less than 5%. When measuring, it is allowed to perform trapezoid correction first. 5.18.3 Presentation of measurement results Measurement results are expressed in degrees (°), where a positive angle means the projector is projecting upwards, whilst a negative angle means the projector is projecting downwards. 5.19 Projection distance at the projected image area 2 m2 5.19.1 Overview This clause specifies the measurement of the corresponding relationship, between the projection distance and the projection area of the projector, in the standard operating state. 5.19.2 Measurement steps Input the all-white field signal. Adjust the projection distance, to make the projection area 2 m2. Measure the vertical distance, between the center point of the projector lens and the projection screen at this time. Record it as the projection distance, when the projected image area is 2 m2, in meters (m). For reflective projectors, measurements are made, in accordance with the test methods, which are specified in their product specifications. 5.19.3 Presentation of measurement results Measurement results are expressed in meters (m). 5.20 Power consumption of whole machine 5.20.1 Overview This clause specifies the measurement of the power consumption of the projector, in the standard operating state. 5.20.2 Measurement steps a) Adjust the projector to the standard operating state, which is specified in 4.6; b) Record the power consumption, in the state of measuring the optical output parameters in 5.2. 5.20.3 Presentation of measurement results Measurement results are expressed in watts (W). 5.21 Passive standby power 5.21.1 Overview This clause specifies the measurement of the active power of the projector, in passive standby mode. 5.21.2 Measurement steps a) Make the projector be in passive standby mode, by remote control or panel switch: b) After being in the passive standby mode for at least 10 minutes, monitor the reading of the power meter, for at least 5 minutes. If the reading fluctuation is less than 5%, during this period, the reading is considered to be stable; the power reading can be directly recorded as the passive standby power consumption: c) If the reading of the power meter cannot be stabilized, it shall use a power meter, which has a power averaging function, to monitor for not less than 5 minutes. 5.23 Remote control distance 5.23.1 Overview This clause specifies the measurement of the farthest distance, that the remote control can make the projector work normally, when the projector is remote controlled. 5.23.2 Measurement steps The working voltage of the remote control transmitter shall be the rated value. The remote control infrared light's receiving window surface is in the environment of natural light or fluorescent lamp illumination of (200 ± 50) lx; the projector inputs composite test diagram; on the straight line perpendicular to the infrared receiving window; use the remote control to send various commands to the projector; measure the maximum distance from the transmitter window of the remote control to the receiver window of the projector, when the projector is receiving normally. 5.23.3 Presentation of measurement results Measurement results are expressed in meters (m). 5.24 Controlled angle 5.24.1 Overview This clause specifies the measurement of the maximum horizontal and vertical angles, at which the remote control can make the projector work normally, when the projector is remotely controlled. 5.24.2 Measurement steps Set according to the provisions of 5.23.2. The remote control transmitter sends various commands to the projector, in the horizontal and vertical directions, by deviating from the vertical line. Measures the maximum horizontal and vertical angles, when the projector can receive normally, at a controlled distance of 5 meters. 5.24.3 Presentation of measurement results Measurement results are expressed in degrees (°). 5.25 Mass of whole machine 5.25.1 Overview This clause specifies the measurement of the overall mass of the projector. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.