In the digital era, data centers are the “information heart” that supports the rapid development of AI, cloud computing and intelligent manufacturing. Their core requirement of uninterrupted 24/7 operation depends on precise control and stable support throughout the entire power chain. As a global leader in electrical measurement, HIOKI draws on 90 years of accumulated measurement expertise to create scenario-based solutions that deeply cover the full lifecycle needs of data centers, including planning and acceptance, daily operation and maintenance, hidden-risk troubleshooting, and compliance audits. Focusing on three core application scenarios, HIOKI uses highly precise data to safeguard the stable and efficient operation of data centers.

The stability of a data center begins with every precise measurement. Every slight fluctuation in parameters may cause immeasurable business losses. Industry data shows that downtime in data centers can cost up to tens of millions of dollars per minute, and 39% of unplanned outages are caused by power system failures.

With high-precision and highly reliable measurement products, HIOKI directly addresses industry pain points. Each instrument is deeply connected to real data-center operation and maintenance scenarios, making every measurement a solid foundation for safety assurance.

1. UPS Power System Testing: Holding the First Line of Defense for Uninterrupted Operation

The UPS power supply is the “emergency protection core” of a data center. Whether it can seamlessly take over the load during a mains power failure and ensure uninterrupted business operations directly determines business continuity. HIOKI has developed a dedicated testing solution covering the full process of UPS hosts and supporting battery packs, including installation acceptance, daily inspection, performance verification and fault troubleshooting. Without interrupting system operation, hidden risks can be accurately identified, equipment performance can be verified, and the emergency power supply line of defense can be strengthened.

01 Battery Tester BT3554-55

Applicable scenarios: Daily inspection of UPS battery packs in online operation, quarterly performance verification, aging battery inspection, and acceptance of new batteries entering storage in data centers.

As a dedicated device for UPS battery testing, it mainly supports uninterrupted internal-resistance testing of batteries. The entire battery string can be tested while the UPS remains online, without interrupting operation. Millisecond-level test speed enables quick acquisition of battery internal resistance and voltage data, accurately identifying aging batteries with abnormal internal resistance, and allowing early detection of potential risks such as insufficient battery capacity and aging decay. It also includes test data storage, enabling complete retention of battery lifecycle operation data for later tracking, analysis and capacity trend prediction, helping ensure reliable discharge of the UPS backup power supply during mains power failures.

02 Electronic Insulation Resistance Tester IR5051

Applicable scenarios: Live insulation performance inspection of UPS DC busbars, charge/discharge circuits and battery packs, insulation retesting after faults, and insulation acceptance before commissioning new systems.

Designed specifically for UPS DC system testing, it supports live testing of DC systems with a maximum test voltage of up to 2000 V. The insulation performance of the entire circuit can be tested without shutdown, solving the industry pain point that traditional testing requires interruption of backup power. Data can be conveniently transmitted via Bluetooth, while faulty batteries and insulation abnormal points can be identified and located, greatly improving the efficiency of UPS insulation fault troubleshooting and emergency handling, and preventing UPS failure risks caused by DC system leakage or short circuits.

03 AC/DC High-Voltage Clamp Meter CM4375-93

Applicable scenarios: Electrical parameter verification at UPS host input and output terminals, AC/DC line load-rate testing, measurement of densely wired circuits inside distribution cabinets, and emergency fault troubleshooting.

It fully meets the needs of non-power-off testing for UPS and supporting circuits. The maximum measurable DC high voltage is 2000 V, and multiple parameters such as current and DC power can be measured in one stop. Equipped with a slim clamp jaw, it can easily enter the narrow spaces of densely wired distribution cabinets in data centers for convenient and efficient measurement. The built-in automatic AC/DC detection function automatically identifies AC or DC current types without manual switching, providing comprehensive and reliable data support for real-time UPS operating status monitoring, abnormal load troubleshooting and rapid fault location.

2. Electrical Equipment Temperature Detection and Environmental Temperature Monitoring: Building the Equipment Operating Environment Defense Line

Data centers have dense equipment and high heat output from computing devices. The ambient temperature and humidity of computer rooms, the surface temperature of core electrical equipment, and emergency lighting illuminance directly affect the service life and operational safety of servers and storage equipment. They are also key control indicators for preventing electrical fires and equipment downtime. HIOKI provides a comprehensive environmental and equipment temperature monitoring solution that covers routine inspection and long-term monitoring across all areas and all equipment in the computer room, helping precisely manage the operating environment and resolve risks caused by environmental abnormalities in advance.

01 Infrared Thermometers FT3700-20 and FT3701-20

Applicable scenarios: Daily infrared temperature inspection of high- and low-voltage busbars, circuit breaker terminals, UPS hosts, transformers and distribution cabinet joints in data centers; periodic thermal-risk inspection of heavily loaded equipment; and emergency fault hot-spot location.

Designed for non-contact temperature measurement of electrical equipment, these instruments can quickly detect the surface temperature of core electrical equipment from a distance, without power shutdown or contact with live conductors, thereby avoiding inspection and electric-shock risks. Millisecond-level response enables fast capture of equipment overheating abnormalities, helping identify thermal risks caused by poor terminal contact, line overload and component aging in advance, preventing electrical fire risks from the source and protecting the safe operation of core equipment.

02 Temperature and Humidity Data Logger LR8514

Applicable scenarios: 24/7 continuous temperature and humidity monitoring of cold aisles, hot aisles, server cabinets, battery rooms, precision air-conditioning rooms and distribution rooms in data centers; uneven cooling/heating source tracing; and auxiliary monitoring for computer-room PUE optimization.

It enables long-term continuous monitoring of temperature and humidity across the entire data center. Data collection and recording are completed automatically without manual attendance. It can provide real-time feedback on dynamic changes and regional differences in computer-room temperature and humidity, accurately identifying abnormalities such as excessive hot-aisle temperatures, local hot spots in cabinets and cooling loss in cold aisles. This helps ensure that the computer-room environment meets national standards for equipment operation, avoids server downtime and battery-life reduction caused by abnormal temperature and humidity, and provides accurate data support for precision air-conditioning strategy optimization and PUE improvement.

03 Lux Meter FT3424

Applicable scenarios: Routine lighting compliance testing in main computer rooms, auxiliary areas, support areas and emergency evacuation passages; annual verification of fire emergency lighting systems; and illuminance testing for project acceptance.

Compliant with the international DIN 5032-7 Class B standard, it can accurately measure illuminance values in different scenarios such as regular computer-room lighting, emergency lighting and evacuation indicator lights. It supports data storage and remote measurement, making it well suited to low-illuminance emergency scenario testing required by fire regulations. It helps ensure that computer-room lighting systems comply with standards and that emergency lighting systems can operate reliably during power outages, meeting the full-process requirements of fire acceptance and routine compliance inspection.

04 Digital Multimeter DT4215

Applicable scenarios such as regular computer-room lighting, emergency lighting and evacuation indicator lights. It supports data storage and remote measurement, making it well suited to low-illuminance emergency scenario testing required by fire regulations. It helps ensure that computer-room lighting systems comply with standards and that emergency lighting systems can operate reliably during power outages, meeting the full-process requirements of fire acceptance and routine compliance inspection.

04 Digital Multimeter DT4215

Applicable scenarios: Routine all-scenario inspection by data-center electrical operation and maintenance teams, root-cause investigation of abnormal equipment temperature, basic parameter verification of low-voltage electrical circuits, and rapid location of small faults.

It fully meets daily inspection needs supporting electrical equipment temperature detection and environmental monitoring. With convenient operation and reliable measurement accuracy, it can quickly measure basic parameters such as voltage, current and resistance. When infrared temperature measurement detects abnormal equipment heating, it can assist in checking root causes such as overload, poor contact and circuit short circuits, completing abnormality confirmation and fault location in one stop and greatly improving frontline operation and maintenance inspection efficiency.

05 Digital Multimeter DT4253

Applicable scenarios: Control signal measurement for precision air conditioning, fresh-air systems, fire gas alarm equipment and cabinet environment monitoring systems in data centers, as well as troubleshooting of small-current circuits.

Focused on precise testing of microcurrents and small signals, it can accurately capture parameter fluctuations at the milliampere level. It is well suited to the testing needs of various auxiliary systems in data centers, quickly locating issues such as abnormal precision air-conditioning temperature-control signals, false alarms in fire alarm systems and deviations in environmental monitoring data. It helps ensure stable operation of auxiliary systems such as temperature control, fire protection and monitoring, creating a safe and reliable operating environment for core equipment.

3. Power Supply and Distribution System: Ensuring Safe, Efficient and Compliant Power Supply

The power supply and distribution system is the “power transmission artery” of a data center. From utility power access and transformer step-down, to high- and low-voltage distribution and terminal load power supply, the stability, compliance and energy efficiency of the entire chain directly determine the overall power supply safety of the data center. HIOKI provides a complete series of dedicated testing instruments for the full process of power supply and distribution systems, including installation acceptance, daily operation and maintenance, compliance audits and fault troubleshooting. It precisely controls every power link to ensure safe, efficient and compliant power transmission.

01 Power Quality Analyzer PQ3198

Applicable scenarios: Grid-connection compliance testing of high- and low-voltage distribution systems in data centers, transient response analysis during switching between utility power and diesel generators, verification of harmonic treatment results, tracing of power loss sources, and annual power-quality compliance audits.

As a core testing device for power supply and distribution systems, it strictly complies with the international IEC 61000-4-30 Ed.3 Class A standard. It can accurately test voltage and frequency stability, voltage dips and swells, switching transient response, harmonic indicators, three-phase imbalance and system operating efficiency. It can capture millisecond-level momentary interruptions and all types of power abnormalities. With dedicated PQ ONE software, it can directly export test reports that meet national standard requirements, fully supporting grid-connection compliance testing, domestic and international technical communication, third-party audits and other scenarios. It helps address power-quality issues caused by nonlinear loads in data centers from the source, reduces equipment loss, extends equipment service life, and prevents server downtime and precision equipment damage caused by abnormal power quality.

02 Grounding Resistance Tester FT6041-91

Applicable scenarios: Engineering acceptance testing of lightning protection grounding systems, equipment protective grounding and anti-static grounding systems in data centers; annual verification of grounding resistance and soil resistivity; and retesting of grounding systems after lightning faults.

Designed for grounding safety testing in power supply and distribution systems, it can not only accurately measure grounding resistance but also perform professional soil resistivity testing. Equipped with multiple measurement methods, it can adapt to different soil environments and on-site working conditions, offering strong field adaptability. It can accurately identify hidden risks such as poor grounding and grounding aging, effectively preventing safety risks such as lightning damage to equipment, electric shock to personnel and static damage to components caused by non-compliant grounding. It ensures that the grounding design of the power supply and distribution system meets national standard requirements and reinforces the safety baseline for data-center lightning protection.

03 Electronic Insulation Resistance Tester IR5051

Applicable scenarios: Live insulation performance inspection of high- and low-voltage distribution lines, power transformers, switch cabinets and distribution cabinets in data centers; insulation acceptance before commissioning new equipment; and insulation performance retesting after faults.

It fully meets insulation testing needs across all power supply and distribution scenarios. It supports live testing of DC systems, with a maximum test voltage of up to 2000 V. The insulation performance of all lines and equipment can be tested without interrupting power supply, without affecting normal data-center operations. Test data can be conveniently transmitted and archived via Bluetooth. At the same time, insulation abnormal fault locations can be accurately identified and located, enabling rapid troubleshooting of hidden risks such as line aging and insulation degradation, preventing power outages caused by leakage, short circuits and grounding faults, and greatly improving routine inspection efficiency of the power supply and distribution system.

04 AC/DC High-Voltage Clamp Meter CM4375-93

Applicable scenarios: High-voltage DC distribution systems in data centers, high- and low-voltage incoming and outgoing circuits, transformer backup line testing, grid-connection parameter verification for emergency generators, and non-power-off inspection and fault troubleshooting of densely wired circuits.

It fully meets high-voltage non-power-off testing needs in power supply and distribution systems. The maximum measurable DC high voltage is 2000 V, and multiple parameters such as current and DC power can be measured in one stop. The slim clamp jaw can easily enter dense wiring areas inside distribution cabinets to complete measurement. With an IP54 dustproof and waterproof rating, it can adapt to complex on-site environments in machine rooms and distribution rooms and offers excellent durability. The measured value auto-hold function automatically locks readings when values are stable. With automatic AC/DC detection, AC and DC can be automatically identified without manual mode switching. Full-scenario measurement can be completed without interrupting power supply, greatly improving routine inspection and emergency troubleshooting efficiency of the power distribution system.

05 Digital Multimeter DT4215

Applicable scenarios: Daily inspection of low-voltage distribution circuits in data centers, multi-parameter verification of terminal distribution boxes, live detection of socket circuits in machine rooms, and rapid troubleshooting of small electrical faults.

It fully covers the daily inspection needs of multiple power supply and distribution system scenarios. With convenient operation and reliable measurement accuracy, it can quickly measure basic parameters such as voltage, current and resistance. It is a basic testing tool that frontline operation and maintenance personnel can carry with them. It helps quickly investigate basic faults such as false connections, overloads and short circuits, greatly improving the efficiency and coverage of daily power supply and distribution inspections.

06 Phase Detector PD3129-32

Applicable scenarios: Commissioning of new power distribution equipment in data centers, reconstruction of distribution circuits, phase-sequence verification before paralleling diesel generators/UPS systems, phase inspection before wiring motor equipment, and routine operation and maintenance phase-sequence inspection.

It supports non-contact phase-sequence testing and is suitable for high-voltage environments up to 1000 V. Without stripping wires or contacting live conductors, it can quickly determine whether the phase and phase sequence of power distribution lines are correct, eliminating the electric-shock risk of traditional phase-sequence testing. It can effectively prevent motor reverse rotation, equipment burnout and three-phase power imbalance caused by phase-sequence errors, helping ensure stable and safe commissioning and daily operation of power supply and distribution system equipment, with convenient operation and high safety efficiency.