Introduction:
The ZXHL-400P Loop Resistance Tester is developed in compliance with the latest Chinese power industry standard DL/T845.4-2004, integrating high-frequency switching power supply technology with digital circuit design. It is designed for measuring the loop resistance of switching control equipment. Featuring high accuracy and stable performance, this instrument meets the requirements for on-site maintenance of high-voltage switches by power utilities and loop resistance testing in high-voltage switch manufacturing facilities.

Key features:

1.Compliant with DL/T845.4-2004 standard

2.Combines high-frequency switching power supply and digital circuitry

3.Delivers precise loop resistance measurements

4.Ensures reliable operation for field testing and industrial applications

5.Suitable for power departments, utility operators, and switchgear manufacturers

Product Parameters:

1.Operating Conditions: Ambient temperature -10℃ to 40℃, relative humidity ≤80% RH;

2.Measurement Range: 0–2999.9 μΩ;

3.Accuracy: ±(0.2% of reading + 2 digits);

4.Resolution: 0–99.99 (0.01 μΩ); 100.0–9999.0 (0.1 μΩ);

5.Continuous Operating Time: 5s–599s;

6.Communication Interface: RS232 serial port or USB (optional);

7.Test Current: Four fixed output levels: DC 100A, 200A, 300A, 400A;

8.Display: Large-screen Chinese LCD;

9.Power Consumption: >1000W;

10.Maximum Storage Capacity: 200 records;

11.Power Supply: AC 220V ±10%, 50Hz;

12.Dimensions: 313×270×235 mm;

13.Weight: 8.9 kg (excluding accessories).

Features:

1.High Current Output: Utilizes advanced switching power supply technology to deliver continuous high-current output, eliminating the drawbacks of pulsed current sources. Effectively breaks through oxide films on switch contacts for reliable test results.

2.High Stability: Maintains stable readings (±1 digit) on the LCD even under severe interference, ensuring repeatable and consistent measurements.

3.Ultra-High Precision: Employs dual-channel high-speed 16-bit Σ-Δ AD sampling and cutting-edge digital signal processing (DSP) technology. Achieves a resolution of 0.01 μΩ, making it the only domestic loop resistance tester with such precision and stability. Outperforms imported high-current micro-ohmmeters.

4.Intelligent Design:

Auto-ranging based on signal strength for enhanced accuracy.

Over-temperature protection automatically halts current output to ensure safety.

5.Premium Quality:

Key components use imported materials.

Temperature compensation circuitry minimizes environmental impacts.

Military-grade connectors enhance vibration resistance.

6.Advanced Functionality:

Flexible test current selection (100A–400A).

Adjustable test duration (5s–599s), surpassing competitors with fixed or limited operating times.

7.User-Friendly Interface:

Rotary encoder for quick data input.

Configurable date/time settings.

Real-time data storage and instant printing.

8.Versatile Connectivity: Supports RS232 serial (9-pin) or USB for data transfer to computers for analysis.

9.Portability: Compact size (313×270×235 mm) and lightweight design (8.9 kg) for easy transport.

Product picture