This standard specifies the measurement method of the electrical and optical performance of high temperature TV systems for furnaces. This standard applies to the measurement of the electrical and optical performance of high temperature TV systems for furnaces. GB/T 15415-1994 Measurement method of high temperature TV systems for furnaces GB/T15415-1994 Standard download decompression password: www.bzxz.net

UDC 621.183. 4 : 621.397.13
National Standard of the People's Republic of China
GB/T15415—94
Methods of measurement for furnace high-temperature television system1994-12-06Promulgated
State Administration of Technical Supervision
1995-06-01Implementation
National Standard of the People's Republic of China
Methods of measurement for furnace high-temperature television system1Subject content and scope of application
This standard specifies the measurement methods for the electrical and optical properties of furnace high-temperature television systems. This standard applies to the measurement of the electrical and optical properties of furnace high-temperature television systems (hereinafter referred to as systems). 2 Reference standards
GB3175.3 Transmissive color bar test chart
GB6996.1 Transmissive TV comprehensive test chart GB6996.12 Transmissive TV grayscale test chart GB/T15414
3 Measuring instruments
3.1 Oscilloscope
General technical conditions for high temperature TV system for furnace
Band width: 0~20MHz
Scanning time factor: 50ns/div.
3.2 Vector oscilloscope
Phase error: ±1°;
Correction circle distortion: better than ±3%
Amplitude error: 3%;
There are PAL and NTSC files.
3.3 Video clutter meter
Frequency range: 40Hz~10MHz
Response: ±0.5dB;
Test signal: video signal or full TV signal; Measurement range: 0~80dB;
Degree: ±1dB.
4 Measurement conditions
Unless otherwise specified, the test shall be conducted under the following conditions. 4.1 Test conditions
Degree: 15~35℃,
Relative humidity: 45%~75%
Atmospheric pressure: 86~106kPa;
Approved by the State Administration of Technical Supervision on December 6, 1994, GB/T15415-94
Implementation on June 01, 1995
Source: 220±4.4V,
50±0.5Hz.
4.2 Arbitration conditions
Crystal: 20±2℃;
Relative humidity: 65%;
Atmospheric pressure: 100kPa;
Source: 220±4.4V;
50±0.5Hz.
4.3 Light source, illumination and scanning area (graphic size) GB/T15415-94
4.3.1 The black and white image system uses A-type light source with a color temperature of 2856K, and the color image system uses a halogen tungsten lamp with a color temperature of 3200K. 4.3.2 The test illumination shall comply with the provisions of the product standard for camera devices on the target surface illumination. 4.3.3 The scanning area shall comply with the provisions of the product standard for camera devices. Note: ① If the measurement result is not related to the color temperature, other light sources may also be used. ② The conversion formula between the illumination of the target surface of the camera device and the illumination on the test chart is shown in Appendix A (Supplement). 4.4 The total length of the video cable used for measurement is 10m4.5 The external load resistance at the input end of the monitor is 75±3.75Ω. 4.6 The various adjustment knobs of the camera are placed in the normal working position. 4.7 According to the imaging surface size specified in the product standard, adjust the distance between the camera and the test pattern so that the border of the test pattern image fills the entire screen on the monitor.
5 Measurement method
The basic measurement device and connection method are shown in Figure 1:
5.1 Full TV signalWww.bzxZ.net
Lifting technology
Drag and drop device
Laiyue group
Real quantity not put device
5.1.1 The black and white camera captures the grayscale test pattern of GB6996.12, and the black and white monitor is set to the terminal state. Use an oscilloscope to measure the image signal and synchronization signal amplitude at the input end of the black and white monitor. 5.1.2 The color camera captures the grayscale test chart of GB6996.12, and the color monitor is in the termination state. Use an oscilloscope to measure the brightness signal, synchronization signal and color synchronization signal amplitude at the input end of the color monitor, as well as the difference between the black level and the blanking level. The camera captures the color bar test chart of GB3175.3, and uses a vector oscilloscope to measure the signal at the input end of the color monitor. Measure the amplitude and phase value of the chromaticity signal. When measuring the amplitude value, the color synchronization signal amplitude is calculated as 100%; when measuring the phase value, the color synchronization vector is made to coincide. 5.2 Signal-to-noise ratio
5.2.1 The black-and-white image system is placed in the test state specified in Article 5.1.1 of this standard. Connect the video clutter meter to the input end of the black-and-white monitor, and turn on the 6MHz low-pass filter and 100kHz high-pass filter of the video clutter meter. Replace the white card with the camera, adjust the illumination of the white card, make the image signal amplitude at the input end of the black-and-white monitor 0.4V (peak-to-peak value), and read the signal-to-noise ratio on the video clutter meter. 2
GB/T15415—94
5.2.2 The color image system is set to the test state of 5.2. Connect the video clutter meter to the input end of the color monitor, turn on the 6MHz low-pass filter and 100kHz high-pass filter of the video clutter meter, and connect the subcarrier notch filter to eliminate the subcarrier component. The camera changes the white card, adjusts the illumination of the white card, makes the video signal amplitude of the color monitor input end 0.4V (peak-to-peak), and reads the signal-to-clutter ratio on the video clutter meter.
5.3 Brightness identification level
The camera captures the grayscale test chart of GB6996.12, and reads the maximum distinguishable brightness identification level on the monitor by visual method. 5.4 Image resolution
The camera captures the comprehensive test chart of GB6996.1, and reads the maximum number of TV lines that can be distinguished in the center of the image on the monitor. Additional remarks:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by Changzhou TV Factory. The main drafters of this standard are Meng Weixiong, Zheng Yongwu, Zhu Minghao, Cai Hongxia and Xi Shucun.
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