GB/T 4301-2026Marine electromagnetic logs (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document replaces GB/T 4301-2008 "Marine Electromagnetic Speedometers". Compared with GB/T 4301-2008, the only changes are structural adjustments and editing.

Aside from the sexual alterations, the main technical changes are as follows.

a) The appearance requirements have been changed (see 4.2, 4.3 in the 2008 version);

b) Installation requirements have been changed (see 4.3.1, 4.4 in the 2008 version);

c) Added speed display requirements (see 4.3.2);

d) Major functional requirements have been changed (see 4.4, 4.1.2 in the 2008 version);

e) Performance requirements and testing methods have been changed (see 4.5, 5.6, 5.7; 4.5 and 5.24 in the 2008 edition);

f) The accuracy requirements and methods for distance calculation have been removed [see 4.5.1b) and 5.3 in the 2008 edition];

h) The insulation resistance requirement under humid and hot conditions has been removed [see 4.6.3c) of the 2008 edition];

i) The requirements and test methods for water pressure resistance have been revised (see 4.7, 4.10, and 4.5.6 and 5.9 in the 2008 edition);

j) The maintainability requirements have been changed (see 4.10, 4.8 in the 2008 edition);

k) Security requirements have been changed (see 4.11, 4.9 in the 2008 version);

l) The requirements and methods for environmental adaptability tilt and sway tests have been removed (see 4.11.3 and 5.18 in the 2008 edition);

m) The requirements and methods for environmental adaptability spray testing have been removed (see 4.11.4 and 5.19 in the 2008 edition);

(n) Added requirements and testing methods for zero-point stability (see 4.5.5, 5.9);

o) The environmental adaptability requirements and testing methods have been revised (see 4.13, 5.19, and 4.11, 5.16~5.18 of the 2008 edition);

p) A functional testing method has been added (see 5.2);

q) A security verification method has been added (see 5.17);

r) An additional testing method for enclosure protection has been added (see 5.20);

s) The test classification has been changed (see 6.1, 2008 edition of 6.1).

1 Scope

This document specifies the requirements, inspection rules, marking, packaging, transportation and storage of marine electromagnetic logs, and describes the corresponding inspection methods.

This document applies to the design, production, and inspection of electromagnetic speed meters for water velocity information.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 191 Packaging and Storage Graphic Symbols

GB/T 4208 Degrees of protection provided by enclosures (IP code)

GB/T 5080.7 Verification Test Scheme for Failure Rate and Mean Time Between Failures under the Constant Failure Rate Assumption in Equipment Reliability Testing

GB/T 12267-1990 General requirements and test methods for marine navigation equipment

GB/T 13384 General Technical Requirements for Packaging of Mechanical and Electrical Products

GB/T 31843.3 Digital interfaces for marine navigation and radio communication equipment and systems - Part 3: Serial data equipment networks

IEC 60945:2002 COR1.2008 General requirements for marine navigation and radio communication equipment and systems; test methods and requirements.

3 Terms and Definitions

The following terms and definitions apply to this document.

3.5 Electromagnetic speedometers operate by using sensors to simulate speed signals