5kV Intelligent Insulation Resistance Tester

Product Introduction

In accordance with power testing requirements, the ME-W20W Smart Dual-Display Insulation Resistance Tester is an intelligent testing device made for high-voltage, high-capacity equipment in power systems. It has a test range of 0-1TΩ and allows multi-range DC voltage output from 500V to 5000V. It has a dual digital-analog display architecture and real-time sampling and computation technology for accurate, interference-resistant readings. It can perform three core tests: standard insulation resistance, absorption ratio, and polarization index. The device has 200 sets of data storage for retrieval, undervoltage protection, and AC/DC dual-use functionality. It guarantees easy operation due to its small size and low weight. It strikes a compromise between safety and usefulness and is appropriate for insulation testing on a variety of equipment, such as cables, generators, and transformers.

Product Parameter (specification)

Output Voltage	DC;-500V, -1000V, -2500V, -5000V
Output Voltage	Error;±5% FS (FS denotes full-scale value);
Test Accuracy Range	1 MΩ to 20 MΩ;Error;±10% FS (FS denotes full-scale value); 20 MΩ to 1000 MΩ;±5% FS (FS denotes full-scale value); 1 GΩ to 20 GΩ;±5% FS (FS denotes full-scale value); 20 GΩ to 200 GΩ;±10% FS (FS denotes full-scale value); 1T ≥ 200GΩ Error;±20% FS (FS denotes full-scale value); Test Range;500V (0-10GΩ) 1000V (0-20GΩ) 2500V (0-200GΩ) 5000V (0-1TΩ)
Digital Test and Display Range	0-1TΩ
Operating Conditions Ambient Temperature	0℃－40℃ Relative Humidity;≤70％RH
Power Supply Range AC	220V±10% (Powered by built-in lithium battery)
Dimensions & Weight	230mm×190mm×90mm (L×W×H);Weight;＜3kg

Product feature and application

1. **High Adaptability**: Outputs multi-range DC voltages of 500V/1000V/2500V/5000V, with a test range covering 0-1TΩ. Meets insulation testing requirements for various power equipment including cables, generators, and transformers.

2. **Precision Testing**: Short-circuit current exceeds 3.3mA, effectively overcoming limitations of conventional megohmmeters. Utilizes real-time voltage/current sampling calculations to ensure accurate resistance readings even during voltage fluctuations, delivering absorption ratio and polarization index results that closely match actual values.

3. **Clear Display**: Features a dual-display design combining a digital readout with a mechanical dial. The Chinese LED display and dual-scale mechanical gauge intuitively present test resistance, voltage, and time data, while range indicator lights facilitate rapid readings.

4. **User-Friendly Operation**: Equipped with a clearly labeled test keypad supporting three standard tests: insulation resistance, absorption ratio, and polarization index. Compact dimensions (230mm × 190mm × 90mm) and weight under 3kg ensure portability.

5. **Flexible Power Supply**: Built-in high-capacity lithium battery supports both AC and DC operation. Features low-voltage alerts and overcharge protection. Requires periodic charging during prolonged storage.

6. **Practical Data Management**: Automatically displays current time. Stores 200 sets of historical test data with timestamps. Supports query and page-scrolling functions for easy traceability by test personnel.

7. **Strong Anti-Interference**: Shielded terminal wiring design eliminates surface leakage and external electromagnetic interference, ensuring measurement accuracy in complex environments.

8. **Safe and Reliable**: Features a high-voltage output indicator light and locking function. Touching high-voltage lines or disconnecting test leads during operation is strictly prohibited. After testing large-capacity capacitive loads, ensure complete discharge to safeguard personnel and equipment safety.

Prodection details

The instrument is suitable for testing the insulation performance of power systems and various high-voltage, high-capacity electrical equipment, complying with power testing regulations. Specific application scenarios include:

Electrical Equipment Testing: Covers insulation performance testing for cables (core-to-sheath, core-to-core insulation), motors, generators, transformers (high-voltage-to-ground, high-to-low-voltage-end, low-voltage-to-ground insulation), instrument transformers, high-voltage switches, surge arresters, coupling capacitors, and other equipment.

Test Item Adaptability: Capable of performing routine insulation resistance testing, absorption ratio testing, and polarization index testing. Provides preliminary safety assurance and accurate judgment basis for subsequent insulation performance tests such as leakage current, dielectric loss, and partial discharge.

Environmental and Scenario Adaptability: Operates under ambient temperatures of 0°C to 40°C and relative humidity ≤70% RH. Meets insulation testing requirements in scenarios including power operation and maintenance, equipment maintenance, and factory acceptance testing, particularly

Company Qualifications

FAQ

1)What test functions does the ME20W Smart Dual-Display Insulation Resistance Tester support? What are the core operational differences?

Answer:
This instrument supports three core test functions, with the following key operational differences:
Standard Insulation Resistance Test: Access via the "R" key on the panel. Initiate the test after activating the high-voltage output key. After deactivating the high voltage, manually confirm and save the data. Suitable for rapid assessment of equipment's basic insulation performance.
Absorption Ratio Test: Enter via the "K" key. After high voltage output, the instrument automatically times for 60 seconds, capturing resistance values at 15 seconds and 60 seconds to calculate the absorption ratio (e.g., 1.08 for 1.02GΩ at 15 seconds and 1.11GΩ at 60 seconds). Results are automatically saved upon high voltage shutdown.
Polarization Index Test: Enter via the "PI" key. The operation procedure is identical to the absorption ratio test, with only the test type identifier marked as "PI." This evaluates the long-term insulation stability of the equipment.

2) When measuring equipment subject to external electromagnetic field interference (e.g., surge arresters, coupling capacitors), how should one operate to ensure test accuracy?

Answer:
Interference must be eliminated via the shielding terminal (GUARD) connection. Specific steps are as follows:
During wiring, connect the instrument's shielding terminal (GUARD) to the shielding layer of the tested equipment (e.g., the upper flange of a surge arrester).
For tested items with two or more sections (e.g., surge arresters), interference currents generated by upper high-voltage lines, etc., will be intercepted by the shielding terminal and bypass the main test circuit, preventing interference impact.
For the uppermost section of a surge arrester, connect its upper flange to the instrument's EARTH terminal before grounding. This directs interference currents directly to ground (though this method is slightly less effective than shielded terminal wiring).
For standard testing, connect the L terminal (high-voltage output) to the high-voltage conductor of the device under test, and connect the E terminal (earth terminal) to the low-voltage end or ground. Ensure test leads do not drag on the ground to further reduce interference.

3)What are the key precautions regarding wiring, safety operations, and data management when using the instrument?

Answer:
Wiring precautions: Test leads must not touch the ground; for standard testing, connect the L terminal (high-voltage output) to the high-voltage conductor of the test object, and the E terminal (ground terminal) to the low-voltage end or ground; when shielding interference is required, connect the GUARD terminal to the shielding layer of the test object (e.g., the flange of a surge arrester).
Safety Operation: Never touch high-voltage leads when the high-voltage output indicator is lit. Do not disconnect test leads during testing. For high-capacitance loads, discharge before testing and allow several tens of seconds (over 1 minute for extremely large loads) after testing before disconnecting leads.
Data Management: The instrument stores 200 sets of historical data (including test values, voltage, time, and test type). Access via "System - Historical Data" and navigate pages using left/right keys. Calibrate device time using the "Modify Time" function to ensure accurate data traceability.

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