I. Overview of Handheld Transport Clock Products

The handheld timing unit, also known as a portable mobile time‑synchronization clock, is a self‑contained, battery‑powered, high‑precision time‑keeping device that operates independently of fixed networks. It is primarily used in field applications such as on‑site equipment time synchronization, precision testing of time‑distribution systems, temporary time dissemination in network‑less environments, equipment acceptance and calibration, and laboratory accuracy comparisons. The device integrates a highly stable clock, a satellite‑receiving module, a high‑definition display, and multiple signal‑output interfaces. Compact and portable, it is easy to operate and offers long battery life, making it an ideal specialized tool for time‑and‑frequency operations, equipment testing, project acceptance, and scientific research.

II. Introduction to the Model Range of the Entire Product Line

The Zhongxin Chuang handheld time‑synchronization device offers four flagship models, covering all‑scenario mobile time‑distribution needs. DNHH-9 Basic handheld positioning device, compatible with Beidou, GPS Dual-mode time synchronization, with stable timing and high cost-effectiveness, is suitable for general-purpose on-site calibration applications. DNHH-9-R Model: The timing algorithm has been optimized to enhance accuracy retention in signal‑free environments, making it well suited for extended field operations. DNHH-9-GB Model: enhances signal reception, enabling rapid satellite time acquisition even in obstructed or weak-signal environments, and is well-suited for complex outdoor scenarios. DNHH-9-B Pure‑BDS handheld time‑keeping device, featuring domestically developed, fully BDS‑based time synchronization—self‑reliant and controllable—suitable for XinChuang project acceptance, Party and government applications, military‑industrial use, and compliance‑driven scenarios in state‑owned enterprises. All models support handheld portability, independent battery power, and plug‑and‑play operation.

III. Core Functions and Technical Features

The handheld time‑keeping device boasts five core technological features. First, it delivers high‑precision timekeeping, featuring a built-in industrial‑grade, highly stable crystal oscillator that ensures long‑term accuracy even after satellite time synchronization is complete and the signal is lost. Accurate First, it features time‑series operation with no significant cumulative error; second, it is portable and standalone, with a lightweight, all‑in‑one design for handheld use, equipped with a high‑capacity lithium battery—no external power supply or network connection required, making it ideal for mobile applications; third, it offers multiple signal outputs and supports… PPS It offers multi‑type signal outputs, including pulse, network time, and serial‑port time, enabling calibration of a wide range of devices under test. Fourth, it features extremely simple operation: a Chinese‑language graphical user interface with one‑click time synchronization, one‑click timekeeping, and self‑calibration of accuracy—no specialized technical skills required. Fifth, it boasts broad applicability, supporting full‑range applications such as indoor data‑center calibration, field‑site testing, factory acceptance testing of equipment, and precision‑comparison studies in research settings.

IV. Segmentation of Typical Application Scenarios

1. Data center operations and maintenance calibration: conducted on-site for data centers, server rooms, network equipment, and sub‑clock devices. Accurate During time synchronization, identify and resolve device timing discrepancies to standardize the data center’s time reference. 2. Field‑site operations: Providing temporary time synchronization and precision testing for scenarios without fixed network connectivity, such as power base stations, photovoltaic and wind farms, rail transit corridors, and outdoor security equipment. 3. Engineering Acceptance Testing: As a standardized acceptance tool, it is used for the final acceptance of time‑synchronization system projects, assessing the system’s timing accuracy and synchronization consistency to ensure compliance with project specifications. 4. Scientific Research and Experimental Calibration: Providing mobile services for precision measuring instruments and experimental equipment in university laboratories and research institutes. Accurate Time reference, used for temporal calibration of experimental data; 5. Factory Acceptance Testing: Conducted to verify the timing device’s accuracy prior to shipment, ensuring that product specifications meet required standards.

V. Standardized Operating Procedures

The equipment features standardized, well‑defined operating procedures to ensure calibration accuracy and compliance with operational requirements. Step one: power on the device; upon startup, it automatically searches for and locks onto satellite signals, then waits for the display to indicate… “ Time synchronization lock ” , complete standard time synchronization; second, switch to hold‑over mode—once the signal is locked, disable the satellite reception function, and the device enters a local high‑precision hold‑over state; third, perform mobile operations by carrying the device to the site of the equipment under test and connecting it to the target device via the corresponding interface; fourth, Accurate Calibrate, output a standard time signal, and complete the time calibration and accuracy comparison of the device under test. Step five: data retention—record the calibration time, accuracy metrics, and equipment status to ensure traceability and archival of the work. Once the task is finished, the device can be powered off and recharged for repeated use.