Product Introduction

        With the rapid development of China's power industry, preventive testing of electrical equipment has become a crucial aspect in ensuring the safe operation and maintenance of power systems. Insulation diagnosis is an important means of detecting insulation defects or faults in electrical equipment. The insulation resistance tester (Megohmmeter) is a specialized instrument for measuring insulation resistance. The JJG662-89 "Insulation Resistance Tester (Megohmmeter)" approved for implementation in May 1990 has designated it as a mandatory calibration instrument. Currently, electrical equipment (such as transformers, generators, etc.) is trending towards larger capacity, higher voltage, diverse structures, and sealed designs. This requires the insulation resistance tester itself to have features such as high capacity, strong anti-interference capability, diverse measurement indicators, accurate measurement results, simple and rapid measurement processes, and portability.

       Our company's ND25 series insulation resistance tester adopts an ultra-thin taut-band meter head, multiple voltage level outputs, high capacity, strong anti-interference capability, dual AC/DC operation (Type C), simple operation, and time prompt function. It is an ideal testing instrument for measuring the insulation resistance of transformers, mutual inductors, generators, high-voltage motors, power capacitors, power cables, lightning arresters, etc.

Product Features

☆、ND2501B has two voltage outputs (500V/1000V/2500V/5000V), with a resistance measurement range of 0～200GΩ. The resistance range can be automatically converted, with corresponding indications.
☆、Two methods synchronously display the insulation resistance value. The mechanical pointer adopts an ultra-thin taut-band structure with strong shock resistance. The use of a mechanical pointer makes it easy to observe the variation range of insulation resistance, while the dot-matrix LCD screen guides users in operating the instrument and accurately obtains measurement results.
☆、The mechanical meter and LCD screen are integrated into one. Dual-scale display with automatic range conversion. Colored scales are easy to read, and LEDs display corresponding colors.
☆、Equipped with an embedded industrial microcontroller and real-time operating software system. High automation, strong anti-interference capability. The instrument automatically calculates the absorption ratio and polarization index without manual intervention.
☆、User-friendly operation interface. Various measurement results have anti-power-off functionality and can store up to 20 consecutive measurement results.
☆、When the instrument generates high voltage, an audible prompt is output.
☆、Built-in residual high-voltage discharge circuit. After testing, residual high voltage on the tested equipment is automatically discharged.
☆、Dual AC/DC operation, equipped with rechargeable batteries and an AC adapter.
☆、Portable design for easy field operation.
☆、High-voltage short-circuit current ≥3mA. It is an ideal testing instrument for measuring the insulation resistance of large transformers, mutual inductors, generators, high-voltage motors, power capacitors, power cables, lightning arresters, etc.

Technical Parameters

☆、Output Voltage: 500V, 1000V, 2500V, 5000V
☆、Resistance Measurement: 1MΩ～20GΩ (500V), 2MΩ～40GΩ (1000V), 5MΩ～100GΩ (2500V), 10MΩ～200GΩ (5000V)
☆、Testing Accuracy: ±5％
☆、Short-Circuit Current: ≥3mA
☆、Power Supply: 8 AA batteries (8 AA rechargeable batteries, external charger)
☆、Operating Environment: -10℃～40℃, relative humidity 85％
☆、Storage Environment: -20℃～60℃, relative humidity 90％
☆、Insulation Resistance: ≤2000MΩ when voltage between circuit and casing is 1000V DC
☆、Withstand Voltage: Withstands 2500V AC between circuit and casing for 1 minute
☆、Dimensions: 230mm × 190mm × 90mm
☆、Weight: 2kg