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JJF 1898-2021 English PDF

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JJF 1898-2021: Calibration Specification for Waveform Monitors
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Basic data

Standard ID JJF 1898-2021 (JJF1898-2021)
Description (Translated English) Calibration Specification for Waveform Monitors
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A56
Word Count Estimation 30,375
Issuing agency(ies) State Administration for Market Regulation

JJF 1898-2021: Calibration Specification for Waveform Monitors

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Waveform Monitors National Metrology Technical Specifications of the People's Republic of China Waveform monitor calibration specification Released on 2021-02-23 2021-08-23 implementation Issued by the State Administration for Market Regulation Waveform monitor calibration specification Replace JJG120-1990 Focal point. National Radio Metrology Technical Committee Main drafting unit. The Third Research Institute of China Electronics Technology Group Corporation Participated in the drafting unit. China Institute of Metrology This specification entrusts the National Radio Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification. Liu Lei (The Third Research Institute of China Electronics Technology Group Corporation) Han Dong (The Third Research Institute of China Electronics Technology Group Corporation) Wu Zhaochun (China Institute of Metrology) Participating drafters. Jiang Zhiguo (The Third Research Institute of China Electronics Technology Group Corporation) Liu Zheng (China Institute of Metrology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Overview (1) 3 Measurement characteristics (1) 3.1 Square wave calibration signal (2) 3.2 Voltage full scale (2) 3.3 Gain adjustment range (2) 3.4 Input/output gain ratio (2) 3.5 Amplitude frequency characteristics (2) 3.6 Filter characteristics (2) 3.7 Linear waveform distortion (2) 3.8 Non-linear waveform distortion (2) 3.9 Scan time error (2) 3.10 Return loss(2) 3.11 SDI eye diagram measurement (2) 4 Calibration conditions (2) 4.1 Environmental conditions (2) 4.2 Measurement standards and other equipment (2) 5 Calibration items and calibration methods (4) 5.1 Appearance and normal working inspection (4) 5.2 Square wave calibration signal (4) 5.3 Voltage full scale (5) 5.4 Gain adjustment range (6) 5.5 Input/output gain ratio(6) 5.6 Amplitude-frequency characteristics (7) 5.7 Luminance filter characteristics and low-pass filter characteristics (8) 5.8 Chroma filter characteristics (insertion loss and filter bandwidth) (9) 5.9 Linear waveform distortion and nonlinear waveform distortion (10) 5.10 Scan time error(10) 5.11 Return loss (10) 5.12 SDI eye diagram measurement (11) 6 Calibration result expression (12) 7 Re-calibration interval (12) Appendix A Original Record Format (13) Appendix B Internal page format of calibration certificate (17) Appendix C Calibration Uncertainty Evaluation Examples of Major Items (21)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications" and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" was compiled. This specification is revised on the basis of JJG120-1990 "Waveform Monitor" and replaces JJG120-1990. Compared with JJG120-1990, in addition to editorial changes, the main technical changes are as follows. ---Standardize the calibration items; ---Removed the displacement linearity error, the gain ratio between the auxiliary video input and the video input A, the common mode rejection ratio, DC recovery function, auxiliary video input amplitude-frequency characteristics, differential filter characteristics, field time waveform distortion, short time wave Inspection and verification items such as shape distortion, overshoot distortion, scanning linearity, etc.; ---Corrected square wave calibration signal, voltage full scale, gain adjustment range, input/output gain ratio, amplitude frequency Features, linear waveform distortion, nonlinear waveform distortion, scan time error, return loss calibration items; ---Added the eye diagram amplitude and eye diagram jitter calibration items of the component serial interface (SDI); ---Added the evaluation example of uncertainty. The previous releases of this specification are as follows. ---JJG120-1990. Waveform monitor calibration specification

1 Scope

This specification applies to PAL system analog video signal and SDI (serialdigital interface) signal measurement The calibration of the functional waveform monitor, and the calibration of the waveform monitor of other standards can be implemented by reference.

2 overview

The waveform monitor is an instrument used to monitor the quality of the TV transmission and to measure the technical indicators of the video signal. Waveform monitor Visualizers are divided into analog waveform monitors and digital waveform monitors. The analog waveform monitors are similar to television oscilloscopes and are used for analog waveforms. Waveform display and measurement of pseudo-composite video (CVBS) signal; digital waveform monitor for digital component serial interface (SDI) signal waveform display and measurement.

3 Metrological characteristics

3.1 Square wave calibration signal 3.1.1 Frequency 100kHz, relative maximum allowable error. ±0.1%. 3.1.2 Amplitude 1.0V, relative maximum allowable error. ±1%. 3.2 Voltage full scale 1V, 0.5V, 0.2V, relative maximum allowable error. ±1%. 3.3 Gain adjustment range 0.5~1.4. 3.4 Input/output gain ratio The gain ratio of the input channel to the auxiliary video output. 0.99~1.01; The gain ratio of the input channel to the image monitoring output. 0.98~1.02. 3.5 Amplitude-frequency characteristics -2%~2% (50kHz≤f≤6MHz); -5%~2% (6MHz \u003cf≤10MHz)。 3.6 Filter characteristics 3.6.1 Luminance filter Attenuation at 1MHz≤3dB; The attenuation at the chrominance subcarrier frequency (4.43MHz) is ≥32dB. 3.6.2 Low-pass filter Above 500kHz, the attenuation is ≥14dB. 3.6.3 Chroma Filter 3.6.3.1 Insertion loss of chrominance filter

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