5KV-1000GΩ Digital Insulation Tester ( HTC – 7250IN )

Description

The HTC 7250IN Insulation Resistance Tester is a professional-grade diagnostic instrument uniquely engineered for high-voltage insulation testing up to 5 kV and resistance measurement as high as 1,000 GΩ. Designed to meet the demands of maintenance engineers, safety inspectors, and utility technicians, it offers unparalleled precision, versatility, and reliability in assessing insulation health across industrial, commercial, and critical infrastructure deployments.

At the heart of the 7250IN is a multi-level insulation resistance range covering up to 20 GΩ at 500 V, 40 GΩ at 1 kV, 100 GΩ at 2.5 kV, and a full 1,000 GΩ at 5 kV. Regardless of test voltage chosen, resolution remains sharp at 0.01 MΩ, and accuracy holds impressively across ranges: ±(3% of reading + 5 digits) for initial scales (up to 99.9 MΩ), ±(5% +5 digits) between 100 MΩ and 99.9 GΩ, and ±(10% +5 digits) at extreme high-resistance ranges. These specifications translate into accurate detection of degraded insulation even across highly resistive systems.

Test current remains purposefully limited to 1 mA–1.2 mA under load conditions (~5 MΩ), safeguarding sensitive circuits and avoiding unwanted tripping of protective relays. In open-circuit conditions, the output voltage is automatically maintained within ±20% tolerance of the selected test voltage.

In addition to its robust insulation testing mode, the instrument provides essential AC/DC voltage measurement up to 600 V with ±2.0% + 3 digits accuracy and 1 V resolution, enabling verification of de-energized circuits before starting insulation tests. Phase detection functions are included in select variants for three-phase wiring validation. These dual-capability features make the 7250IN both a safety tool and a testing device in one.

The user interface consists of a large backlit LCD display (1,999-count), with bold digits for visibility even in ambient field conditions. Functional icons alert operators to high voltage, low battery, or over-range states. Key user controls include Data Hold, Compare mode, Auto-Ranging, Auto Power-Off, and the ability to store up to 18 memory test sets. When held at startup with the USB button, the meter enters a charging/USB data-transfer mode, making it versatile for logging mode or continuous charger operation.

Safety and regulatory compliance are built into the design: the 7250IN conforms to EN 61010‑1:2010, supports CAT III 600 V and CAT II 1000 V insulation categories, and is double insulated to prevent electric shock. The low test current and automatic overload warning (“OL”) further protect both operator and device during field testing.

Designed for real-world durability, this insulation tester measures approximately 190 × 155 × 75 mm and weighs about 416 g when powered by eight AA batteries. It also supports an optional DC power adapter for extended use. Standard accessories include test leads, USB cable, data software, power adaptor, and a protective carrying case—providing a complete solution out of the box.

Practical application scenarios for the HTC 7250IN include:

• Insulation assessment of cables, motors, transformers, switchgear, and control panels at test voltages ranging from 500 V through 5 kV.

• Preventive maintenance audits, such as detecting moisture ingress, tracking ageing insulation, or verifying new installations before energization.

• Compliance testing for industrial and building electrical installations, especially where high-resistance thresholds (e.g., >100 GΩ) are required.

• Phase sequence verification (on models that support it) alongside insulation testing, streamlining wiring checks without separate tools.

• Site-level troubleshooting, where built-in voltage measurement protects against accidental energization before applying insulation voltage.

Key Features & Specification Highlights

• Insulation Voltage Options: 500 V / 1000 V / 2500 V / 5000 V

• Insulation Resistance Range: 0.00 MΩ up to 1,000 GΩ depending on voltage

• Resolution: 0.01 MΩ across all ranges

• Short circuit current: 1 mA–1.2 mA @ ~5 MΩ

• AC/DC Voltage: 30–600 V (1 V resolution; ±2.0% +3 digits)

• Display: Clear backlit LCD (1,999-count) with HV, memory, low-battery, and “OL” indicators

• Memory: Stores up to 18 readings; USB interface for data download via PC

• Usability Modes: Data Hold, Compare, Auto-Ranging, Auto-Off

• Safety Ratings: EN 61010‑1:2010; CAT III 600 V / CAT II 1000 V; Double-insulated design

• Power Supply: 8 × AA batteries or optional DC adapter

• Dimensions & Weight: ~190 × 155 × 75 mm; ~416 g

• Accessories: Test leads, USB cable, software, adaptor, carry case

In summary, the HTC 7250IN insulation tester combines powerful high-voltage testing capability (up to 5 kV), ultra-high resistance measurement range (1,000 GΩ), smart safety features, and data logging in a rugged, intuitively designed instrument. Its broad voltage coverage, small test current design, and advanced user functions make it ideal for professionals needing comprehensive insulation analysis, preventive maintenance capabilities, and trustworthy compliance validation—without compromise in portability or ease of use.