Product Overview

The MOEORW-WRY75 high voltage insulation resistance tester operates on the voltage-current principle R=V/I, adopting high-voltage inversion circuits to output 5 selectable test voltages from 500V to 10000V. It automatically captures resistance readings at 15s, 60s and 600s to compute absorption ratio (R60s/R15s) and polarization index (R10min/R1min). These two metrics serve as core criteria to evaluate insulation aging, dampness and hidden defects of transformers, cables and motors, complying with mandatory EU electrical pre-energization inspection rules. Built with lithium power supply and full safety protection circuits, the unit delivers stable anti-interference measurement for long-duration power industry testing.

Technical Specifications

Core Measurement Parameters

Rated Test Voltage	500V	1000V	2500V	5000V
Operating Voltage Deviation	±10% of rated voltage	±10% of rated voltage	±10% of rated voltage	±10% of rated voltage
Resistance Measuring Range	0.001–100 GΩ	0.001–200 GΩ	0.001–500 GΩ	0.001–1000 GΩ
Display Max Value	1999	1999	1999	1999
Resistance Accuracy	±10% RDG + 2d	±10% RDG + 2d	±10% RDG + 2d	±10% RDG + 2d
Short-circuit Output Current	≥5 mA	≥5 mA	≥5 mA	≥5 mA
Ratio Calculation Range	0.1–19.99	0.1–19.99	0.1–19.99	0.1–19.99
Ratio Accuracy	±2% RDG + 1d	±2% RDG + 1d	±2% RDG + 1d	±2% RDG + 1d
Full-scale Insulation Test Limit	2 TΩ

General Mechanical & Electrical Parameters

Item	Parameter
Max Power Consumption	≤10 W
Operating Environment	0–40℃, RH ≤85%
Dielectric Withstand Capacity	AC 2.5 kV, 50 Hz, 1 min
Built-in Battery	12.6 V 2.0 Ah Li-ion
Charging Input	DC 24 V / 0.5 A (±10%)
Overall Dimension	260 mm × 135 mm × 68 mm
Net Weight	~1.5 kg

Core Functional Features

1.Hardware & Circuit Design Equipped with multi-stage high-voltage output modules and ≥5mA short-circuit current, the device rapidly charges capacitive loads like power cables. Independent anti-interference sampling circuits offset external magnetic field interference, while integrated safety circuits prevent overvoltage and reverse connection damage. Undervoltage alert protects lithium cells from deep discharge.
2.Measurement Performance 3½ digit auto-ranging LCD supports real-time resistance reading up to 2 TΩ. Embedded ambient temperature detection standardizes test data. An independent timing buzzer alerts every 15 seconds; the unit auto-saves 15s/60s/600s resistance values and instantaneously computes absorption ratio and polarization index.
3.Operational Practicality Dedicated G shielding terminal eliminates measurement errors caused by surface leakage from damp or contaminated insulation. One-click data recall accesses stored test records without retesting. Independent high voltage start/stop button enables immediate power cut to mitigate electric shock risks, with lightweight compact housing for field portable use.

Application Fields

Power Industry: Routine insulation diagnosis of main transformers, high-voltage cables, generators and switchgear cabinets.

Electrical Manufacturing: Factory quality inspection of motors, wiring harnesses and low-voltage distribution assemblies.

Construction Electrical Works: Mandatory pre-power-on insulation validation for building wiring and civil power distribution systems per EU regulations.

Industrial Equipment Maintenance: Periodic fault detection for automation control cabinets and marine electrical facilities.

Material Laboratory: Aging and polarization characteristic testing of new insulating materials.

Troubleshooting & Maintenance

Fault Troubleshooting Table

Fault Phenomenon	Root Cause	Solution
Blank screen or auto power-off on startup	Battery undervoltage	Charge fully for minimum 8 hours for initial use
	Switch startup failure	Power off and re-rotate function knob
Constant "1999" display during testing	Open test circuit	Inspect connection of test leads and clips
	Resistance exceeds measurement upper limit	Upgrade to higher-range tester model
Charging failure	Damaged charging adapter/cable	Replace original DC24V/0.5A charging accessories

Daily Maintenance Rules

1.Pre-test: Fully cut off DUT power and discharge residual charges; clean insulation surfaces to reduce deviation.
2.Wiring: Secure E terminal to reliable ground; attach G shielding ring to sample insulation layer for high-precision testing.
3.Battery Care: Charge every 3–5 months during long-term storage; the tester locks high-voltage output while charging for safety.
4.Post-test: Wait for full automatic discharge of capacitive samples before detaching test wires.