GB/T 14307-2025Measuring methods for non-broadcast video tape properties (English PDF)

Foreword

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

GB/T 14307-2025 is the Chinese national standard on measuring methods for non-broadcast video tape properties, in the field of information technology. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 1 August 2025 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 February 2026. Classification: ICS 35.220.20, CCS G82. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

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.