The Insulation Resistance Tester (commonly known as a "megger" or "megohmmeter") is primarily used to measure the insulation performance of electrical equipment and circuits. Its purpose is to assess potential risks of leakage current or insulation aging, thereby ensuring the safe operation of power systems.

**Core Application Scenarios:**

① **Preventive Maintenance:** Periodically inspecting the insulation status of transformers, motors, and cables to prevent short-circuit accidents caused by insulation breakdown.

② **New Equipment Commissioning:** Verifying that the insulation parameters of electrical equipment meet national and industry standards after installation is complete but before formal energization.

③ **Fault Diagnosis:** Locating ground faults or determining the extent of insulation damage when circuits trip or equipment is exposed to abnormal moisture.

④ **Material Testing:** Testing the resistivity of various insulating materials within a laboratory environment.

**Technical Features:**

Features 9 voltage ranges: 500V, 1000V, 2500V, 5000V, 10000V, 15000V, 20000V, 25000V, and 30000V. The maximum test range reaches up to 60 TΩ, and a manual voltage step-up function is also included.

● Designed in strict compliance with safety standards.

● Insulation resistance range: 60 TΩ @ 30 kV.

● Adjustable short-circuit current, with a maximum output of 3 mA.

● Automatically displays test values for the Polarization Index (PI) and Dielectric Absorption Ratio (DAR). It is also capable of measuring leakage current and capacitance, as well as performing Dielectric Discharge (DD) and Step Voltage (SV) tests.

● Superior anti-interference performance: The instrument maintains test accuracy even when subjected to interference currents reaching up to 2 mA.

● Features AC/DC voltage measurement capabilities for the circuit under test, with automatic recognition of whether the voltage is AC or DC.

● Rapid discharge for capacitive test objects: When testing cables, manual discharge is unnecessary; the instrument automatically and rapidly discharges the stored energy.

● Dual Power Supply Modes: Powered by a lithium-ion battery with an operating life of up to 6 hours.

The unit supports charging while in operation. In the event of a power outage, it automatically switches from AC mains power to battery power. ● Simple and intuitive interface, featuring an analog bar graph display for insulation resistance.

● Digital filtering function: Use the filtering feature to mitigate the impact of external interference whenever it causes deviations in the displayed value.

● Comprehensive protection features, including an indicator function for blown fuses.

● Data storage capability, with support for data export.

Technical Specifications:

Safety Specifications

IEC 61010-1: CAT IV 600V, Pollution Degree 2

IEC 61326: EMC Specifications—Electrical equipment for measurement, control, and laboratory use

IEC 60529: IP64 (with case closed)

● AC Power Supply: 220V ±10%, 50/60 Hz, 20 VA

● Battery Power: 16.8V Li-ion battery

● Battery Life: Approx. 6 hours (at 5000V, 100MΩ load)

● Dimensions (L x W x H): 33 cm x 27 cm x 16 cm

● Weight: 3.8 kg

● Output Voltage Accuracy: 100% to 110% of nominal value

● Output Voltage Monitoring Accuracy: ±5% ±10V

● Voltage Measurement Range: AC: 30–600V (50 Hz/60 Hz); DC: 30–600V

● Voltage Measurement Accuracy: ±2% ±3 digits

● Current Test Range: 10 mA

● Current Measurement Accuracy: ±5% ±0.2 nA

● Short-circuit Current: 2 to 5 mA (adjustable output)

● Capacitance Test Range: 20 µF

● Capacitance Test Accuracy: ±10% ±0.03 µF

● Specimen Discharge Rate: From 5000V down to 10V at 1 s/µF

● Guard Protection: Shields against 500 kΩ leakage resistance with 2% error under a 100 MΩ load

● Analog Display Range: 100 kΩ to 10 TΩ

● Digital Display Range: 10 kΩ to 20 TΩ

● Insulation Alarm: 0.01 MΩ to 9999.99 MΩ

● Insulation Resistance Test Range and Accuracy (Temperature: 23 ±5°C; Relative Humidity: 45–75% RH)