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www.ChineseStandard.net Database: 189760 (18 Oct 2025)

GB/T 14307-2025 English PDF

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GB/T 14307-2025: Measuring methods for non-broadcast video tape properties
Status: Valid

GB/T 14307: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 14307-2025	English	519	Add to Cart	5 days [Need to translate]	Measuring methods for non-broadcast video tape properties	Valid	GB/T 14307-2025
GB/T 14307-1993	English	489	Add to Cart	3 days [Need to translate]	Measuring methods for video tape properties		GB/T 14307-1993

Basic data

Standard ID	GB/T 14307-2025 (GB/T14307-2025)
Description (Translated English)	Measuring methods for non-broadcast video tape properties
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G82
Classification of International Standard	35.220.20
Word Count Estimation	26,219
Date of Issue	2025-08-01
Date of Implementation	2026-02-01
Older Standard (superseded by this standard)	GB/T 14307-1993
Issuing agency(ies)	State Administration for Market Regulation, Standardization Administration of China

GB/T 14307-2025: Measuring methods for non-broadcast video tape properties

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14307-2025
ICS 35.220.20 CCSG82 National Standard of the People's Republic of China Replaces GB/T 14307-1993 Methods for measuring the performance of non-broadcast videotapes Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test conditions 3 4.1 Test Environment 3 4.2 Measuring Sample 3 5 Measuring instruments 3 5.1 Measuring microscope or projector 3 5.2 Micrometer 3 5.3 Tensile testing machine 3 5.4 Resistance Measuring Instrument 4 5.5 Magnetic parameter measuring instrument 4 5.6 Photometer 4 5.7 High-Frequency Signal Source 4 5.8 High-frequency voltmeter 4 5.9 TV test signal generator 4 5.10 Color Video Clutter Table 4 5.11 Lost Counter 5 5.12 Low-Frequency Signal Generator 5 5.13 RMS Voltmeter 5 5.14 Frequency Selective Voltmeter 5 5.15 Oscilloscope 6 5.16 Test video recorder (or test dedicated tape transport mechanism) 6 6 Mechanical and physical properties 6 6.1 Tape width 6 6.2 Tape Width Fluctuation 6 6.3 Tape thickness 6 6.4 Magnetic layer thickness 6 6.5 Breaking strength 6 6.6 Yield strength 6.7 Residual elongation 7 6.8 Longitudinal Shrinkage 7 6.9 Wet elongation coefficient 7 6.10 Interlayer Adhesion 7 6.11 Video Head Wear 8 6.12 Transmittance 8 6.13 Gap between tape and leader/trailer tape 8 6.14 Adhesion between magnetic tape and leader/trailer tape 8 6.15 Effective record length 8 6.16 Leader/Trailer Length 8 7 Electrical and Magnetic Properties 9 7.1 Magnetosphere Resistance 9 7.2 Coercive force Hc and residual magnetic induction Br 9 7.3 Rectangular ratio K 9 8 Video Features 9 8.1 Optimal Recording Current Ic 9 8.2 RF output (brightness) 10 8.3 Chroma output level 10 8.4 Video signal-to-noise ratio S/N 10 8.5 Weighted Video Signal-to-Noise Ratio 11 8.6 Chroma Signal-to-Noise Ratio 11 8.7 Frequency Response of FM Channel D 13 8.8 Lost 13 8.9 RF Signal Wear WRF 13 8.10 Still image 13 8.11 Tape Life 13 9 Audio Features 14 9.1 Audio Sensitivity SA 14 9.2 Frequency Response DA 14 9.3 Audio output unevenness ΔSA 14 9.4 Audio signal-to-noise ratio 15 9.5 Noise reduction effect E 15 Appendix A (Normative) VHS Type 12.65mm Spiral Scan Cassette Video Recording System Chroma Signal Recording 16 A.1 Recording Method 16 A.2 Phase rotation of chrominance signal 16 A.3 Recording Level 17 Appendix B (Normative) U-type 19mm spiral scanning cassette tape recording system chrominance signal recording 18 B.1 Chroma Channel 18 B.2 Modulation Mode 18 B.3 Chroma signal bandwidth 18 B.4 Recording Signal Spectrum 18 Appendix C (Normative) Unified Weighted Network for Measuring Continuous Random Clutter in Video 19 C.1 Definition of a unified weighted network 19 C.2 Structure of the Unified Weighted Network 19 C.3 Parameters of the Unified Weighted Network 19 C.4 Insertion loss of uniformly weighted network A 20 C.5 Properties of Uniformly Weighted Networks 20 C.6 Weighting coefficients of unified weighted network for different types of clutter 20 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 14307-1993 "Videotape Performance Measurement Methods". Compared with GB/T 14307-1993, except for the structural adjustment In addition to the integration and editorial changes, the main technical changes are as follows. a) Added a chapter on “Terms and Definitions” (see Chapter 3); b) Added the recording method "VHS type 12.65mm spiral scan cassette video system chrominance signal recording" (see Appendix A); c) Added the recording method "U-type 19mm spiral scanning cassette tape system chrominance signal recording" (see Appendix B); d) Added the measurement method "Uniformly weighted network for measuring continuous random noise in video" (see Appendix C). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Photosensitive Materials (SAC/TC102). This document was drafted by. Aerospace Intelligent Manufacturing Technology Co., Ltd., Lucky Film Co., Ltd., China Banknote Special Anti-Counterfeiting Technology Co., Ltd. company. The main drafters of this document are. Li Renfei, Zang Liheng, Li Na, Zhang Dan, Liu Qian, and Tian Zichun. The previous versions of this document and the documents it replaces are as follows. ---First published in.1993 as GB/T 14307-1993; ---This is the first revision. Methods for measuring the performance of non-broadcast videotapes

1 Scope

This document describes methods for measuring the performance of non-broadcast videotapes. This document is applicable to the measurement of non-broadcast video tapes and can be used as a basis for identification and acceptance testing.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 The thickness of the magnetic layer composed of magnetic powder, adhesive, etc. coated on the tape base. 3.2 Permanent elongation The percentage increase in length of a magnetic tape sample after it is subjected to a specified force for a specified time and the force is removed. 3.3 The change in tape length with temperature and humidity. 3.4 Change in length of a magnetic tape as relative humidity increases. 3.5 interlayer adhesion Adhesion between adjacent layers of a magnetic tape in a wound state. 3.6 The surface resistance of the tape coating over a portion of its length equal to its width. 3.7 coercivity Hc After the magnetic layer on the tape is magnetized to saturation, a reverse magnetic field is applied to reduce the magnetic induction intensity to zero, which corresponds to the magnetic field strength. 3.8 rectangular ratio The ratio of residual magnetic induction intensity to saturation magnetic induction intensity.

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