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QB/T 4251-2024Quartz master clock for ships (English PDF)

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Issued by

Ministry of Industry and Information Technology

Level / Type

National · Recommended

Issue date

October 24, 2024

Implementation date

May 1, 2025

Scope

QB/T 4251-2024 (Quartz master clock for ships) is available as an English-translated PDF.

QB/T 4251-2024 — This standard specifies the operating temperature, voltage range, and working reliability of quartz master and slave clocks for ships, describes the corresponding test methods, specifies inspection rules and markings, packaging, transportation, storage and installation, and gives classifications and electrical parameters that facilitate technical regulations.

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Document preview — QB/T 4251-2024

National Standard of the People's Republic of China

ICS: 39.040.20
Classification: Y 11
Replacing: QB/T 4251-2011

Issued by: Ministry of Industry and Information Technology

What this standard covers1
Document data2

What this standard covers

This standard specifies the operating temperature, voltage range, and working reliability of quartz master and slave clocks for ships, describes the corresponding test methods, specifies inspection rules and markings, packaging, transportation, storage and installation, and gives classifications and electrical parameters that facilitate technical regulations. This standard applies to the production, inspection, sale and installation of a master clock and a sub-clock composed of a master clock connected to multiple sub-clocks by wire, and is used as a reference for the production, inspection, sale and installation of other single quartz clocks used on ships.

Document data

International classification (ICS): 39.040.20.

Chinese classification (CCS): Y11.

Estimated length of the Chinese original: 14,181 words.

Supersedes the earlier edition QB/T 4251-2011.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

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