Contact Resistance Tester
The ZWHR-100R utilizes high-frequency constant current technology to accurately measure micro-ohm contact resistance.
Delivering up to 100A test current, it ensures precise diagnostics for high-voltage switches and cable joints in compliance with IEC standards.
Product Overview
The ZWHR-100R Contact Resistance Tester is designed in compliance with IEC standards for precise micro-ohm measurements.
Utilizing a high-frequency constant current power source and smart power management, it provides highly stable resistance readings for high-voltage switchgear, loop resistance tests, and weld contacts in power supply maintenance.
Key function and feature:
- High-Accuracy Constant Current:
Provides 50A or 100A automatic constant test current without manual regulation, ensuring highly accurate micro-ohm resolution up to 0.1µΩ. - Four-Terminal Measurement:
Employs the four-terminal wiring method to effectively eliminate the influence of test line resistance on the results, ensuring true switch contact resistance values. - Comprehensive Safety Protection:
Features integrated protection mechanisms against overheating, disconnection, and unexpected outages, keeping both the operator and the equipment safe during the test loop. - Smart Device Integration:
Features Bluetooth and RS232 communication, enabling the instrument to be controlled via a special smartphone application to view, save, and manage test results effortlessly. - Data Storage and Export:
Comes with a 7-inch color touch screen, onboard storage for 1000 sets of data, a built-in micro-printer, and USB flash drive support for extensive data management on site.
Technical Details
| Parameter | Specification |
|---|---|
| Model | ZWHR-100R |
| Power Supply | AC 220V ±10%, 50Hz |
| Measuring Current | 50A, 100A |
| Measurement Range | 0~100mΩ (50A), 0~50mΩ (100A) |
| Resolution | 0.1 µΩ (minimum) |
| Accuracy | ±(0.5% ± 2 words) |
| Power | 1000W |
| Working Method | Continuous measurement |
| Operating Temperature | 0°C~40°C |
| Ambient Humidity | ≤90% RH (no dew) |
Model Selection Guide
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
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Parts List
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
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Certificate
Frequently Asked Questions
Contact our engineers for technical support and application guidance.
It is widely used to test the micro-ohm contact resistance of various switches, electrical appliance contact loops, cable wires, and weld contacting points.
The unit utilizes a standard four-terminal wiring method. This completely isolates the test current lines from the voltage measurement lines, effectively eliminating the influence of the test cables’ own resistance.
Yes, the machine features Bluetooth communication. Operators can link it to a special smartphone software application to initiate tests, review results, and save data from a safe distance.
No, this instrument is specifically designed for measuring pure loop resistance and switch contacts. It is not allowed to be used for measuring inductive loops like transformer windings.
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