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HF-WC-630 Ground Loop Impedance Tester
Ground Loop Impedance Tester reliably measures earth loop impedance and prospective short-circuit current without disconnecting power supply. It assesses electrical safety risks effectively and is widely used for routine inspection, acceptance testing and fault checking of low-voltage distribution systems in buildings and industrial sites.
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Functional Features
HF-WC-630 handheld dual-terminal ground loop impedance tester supports two test modes: conventional loop resistance mode and intelligent test mode. The intelligent test mode further includes direct clamp meter measurement, single-side shunt mode and double-side shunt mode.
The conventional loop resistance mode requires disconnecting one side of the ground connection of the tested switch to avoid shunt interference from the grounding grid. The intelligent test mode has two measurement forms. The direct clamp meter mode directly acquires the actual current of the tested loop via current sensors. The single-side / double-side shunt mode adds one or two current sensors. Based on Ohm’s law, it can accurately measure the loop resistance of switches or disconnecting switches without removing ground connections, enabling simple and efficient testing.
The conventional loop resistance mode requires disconnecting one side of the ground connection of the tested switch to avoid shunt interference from the grounding grid. The intelligent test mode has two measurement forms. The direct clamp meter mode directly acquires the actual current of the tested loop via current sensors. The single-side / double-side shunt mode adds one or two current sensors. Based on Ohm’s law, it can accurately measure the loop resistance of switches or disconnecting switches without removing ground connections, enabling simple and efficient testing.
- Handheld and portable design, compact and lightweight, no external power supply required, suitable for mobile field operation.
- Controlled by high-speed chip, high automation level and easy operation.
- Built-in lithium battery power supply with fast charging support.
- Maximum output current up to 200A, fast testing and high measurement accuracy.
- High-definition LCD screen with no visual blind spot, adapting to outdoor strong light conditions.
- Integrated conventional loop resistance mode, direct clamp meter mode, single-side shunt mode and double-side shunt mode to meet diverse application requirements.
- The intelligent test mode enables precise measurement of switch loop resistance without disconnecting ground connections. It saves labor, reduces on-site workload, and eliminates personal and equipment safety hazards caused by false grounding.
- Wireless current clamp adopts open jaw design, suitable for narrow spaces. Wireless data transmission reduces field wiring for higher efficiency and safety.
- Complete protection functions: overcurrent, short-circuit, overheating and battery over-discharge protection.
- Power-off data storage function, capable of storing up to 100 groups of historical test data for inquiry.
- Date and time setting function for user adjustment.
- Voice broadcast function: automatically announces measurement results after testing.
- Optional BLE 4.0 Bluetooth printing function. Test results can be printed automatically after measurement, and historical data can also be printed via Bluetooth printer.
Test Principle
The loop resistance tester provides two test modes: conventional loop resistance mode and intelligent test mode. The intelligent mode includes direct clamp meter measurement, single-side shunt mode and double-side shunt mode.
The conventional mode requires disconnecting one ground connection on both sides of the tested switch. The intelligent mode can accurately measure loop resistance without removing ground connections.
The conventional mode requires disconnecting one ground connection on both sides of the tested switch. The intelligent mode can accurately measure loop resistance without removing ground connections.
Technical Parameters
Main Performance Specifications
| Item | Specification |
|---|---|
| Test Current | 100A/200A adjustable (fixed at 200A under intelligent test mode) |
| Measuring Range | 10μΩ ~ 10mΩ |
| Minimum Resolution | 0.1μΩ |
| Measuring Time | 100A range: selectable 1s/5s/10s/30s/60s 200A range: selectable 1s/5s Intelligent mode: non-selectable, ≤5s |
| Measurement Accuracy | Conventional loop resistance mode: ±(Reading×0.5% +0.2μΩ) Intelligent test mode: ±(Reading×2% +0.5μΩ) |
| Number of Measurements | ≥400 times (100A/1mΩ/1s mode, full battery) |
| Data Storage | Auto storage, max. 100 groups of historical records, query supported |
| System Protection | Overcurrent & short-circuit protection: 330A threshold, quick cut-off within 5ms Overheat protection: protects battery and power components, threshold:70℃ Battery low power protection: testing prohibited when power is low; auto shutdown during over-discharge Battery overcurrent protection: built-in software curve, automatically limits output current |
| Human-Machine Interface | Self-luminous LCD, voice broadcast for data |
| Advanced Function | Optional BLE4.0 Bluetooth printer |
Wireless Current Clamp Parameters
| Item | Specification |
|---|---|
| Measurement Principle | Clamp Hall, non-contact measurement |
| Measuring Range | DC 0~400A |
| Measurement Accuracy | ±(Reading×2% +0.5A) |
| Resolution | DC 0.1A |
| Display | LCD, dimension:32mm×15mm |
| LED Indicator | Power, charging, fully charged, low battery |
| Power Supply | Built-in lithium battery |
| Power Adapter | 5V/1A |
| Charging Port | Type-C |
| Jaw Diameter | Φ68mm |
| Overall Dimension | 215mm×65mm×34mm |
| Weight | 0.5kg |
Power Supply, Weight & Dimensions (Main Unit)
| Item | Specification |
|---|---|
| Power Supply | Built-in lithium battery, fast charging supported |
| Housing Material | Oxidation-resistant insulated ABS |
| Main Unit Weight | ≤1.2kg |
| Main Unit Dimension | 155mm(L) ×110mm(W) ×70mm(H) |
FAQ for Ground Loop Impedance Tester
Q1: What test modes are available on this tester?
A: It supports conventional loop resistance mode and intelligent test mode. The intelligent mode covers direct clamp meter mode, single-side shunt mode and double-side shunt mode to meet diverse testing scenarios.
Q2: What is the biggest advantage of the intelligent test mode?
A: No need to disconnect ground connections of switches. It accurately measures loop resistance, reduces field workload and eliminates safety risks caused by false grounding.
Q3: What output current options can be selected?
A: 100A / 200A adjustable. The current is fixed at 200A when working under intelligent test mode.
Q4: What is the measurement range and resolution?
A: Measuring range: 10μΩ ~ 10mΩ; minimum resolution reaches 0.1μΩ for precise low-resistance testing.
Q5: Does the instrument support data storage and printing?
A: It can store up to 100 groups of test records. Optional BLE4.0 Bluetooth printing function is available to output test reports.
Q6: What are the features of the matched wireless current clamp?
A: Adopts Hall non-contact measurement with open jaw design for narrow spaces. Wireless data transmission reduces wiring work and improves safety.
Q7: How is the instrument powered?
A: Built-in rechargeable lithium battery supporting fast charging. No external power supply required, convenient for outdoor mobile operation.
Q8: What protective functions does the tester have?
A: Equipped with complete protection including overcurrent, short-circuit, overheating, battery over-discharge and overcurrent protection to extend service life.
Q9: Does it support voice prompt?
A: Yes. It is equipped with voice broadcast function, which automatically announces measurement results after finishing each test.
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