Digital Ground Resistance Tester | Solar & Wind Farm Earthing Acceptance | XHDJ705
The XHDJ705 digital ground resistance tester is a microprocessor-based earth resistance meter designed for on-site acceptance and periodical inspection of earthing systems. It performs precision 3-wire and simple 2-wire earth resistance measurements across three gears from 0.01Ω to 2000Ω, and also measures AC earth voltage up to 600V, so field engineers can verify both the resistance of the earth electrode and the presence of dangerous stray voltage with one portable instrument.
Target Audience: Solar PV and wind farm EPC contractors, renewable-energy operation & maintenance teams, and electrical testing engineers who perform earthing acceptance of PV array frames, inverter stations, combiner boxes, transformer plinths and wind turbine tower grounding systems, and who need documented, factory-verified measurement accuracy for handover reports.
Key Specifications
| Parameter | Specification |
|---|
| Model | XHDJ705 |
| Measurement Functions | Earth resistance, earth voltage, low-value resistance |
| Measurement Methods | Precision 3-wire (fall-of-potential), simple 2-wire |
| Earth Resistance Range | 0-20Ω / 0-200Ω / 0-2000Ω (resolution 0.01Ω / 0.1Ω / 1Ω) |
| Earth Resistance Accuracy | ±(2%rdg+3dgt), factory test verified |
| Test Signal | 820Hz, 3mA max test current |
| AC Voltage Range | 0-600V (50Hz), resolution 1V |
| AC Voltage Accuracy | ±(2%rdg+3dgt), factory test verified to 500V |
| Measurement Rate | Voltage: 3 times/sec; Resistance: 5 sec/time |
| Display | 4-digit large LCD with backlight |
| Data Interface | RS232 port for PC data upload |
| Power Supply | DC 9V (6 x 1.5V R14S batteries), 300h continuous standby |
| Working Temperature / Humidity | -10°C to +40°C, ≤80%RH |
| Weight | Approx. 1.44 kg (meter only) |
Engineered for Renewable Energy Site Work
Three switched gears (20Ω/200Ω/2000Ω) with 0.01Ω finest resolution cover single earth electrodes, PV array earth grids and turbine tower earths
820Hz test signal with 3mA max current suppresses 50Hz power-frequency interference typical around inverter stations and substations
AC earth voltage measurement (0-600V, 50Hz) warns of stray voltage before personnel touch earth conductors
4-digit LCD with backlight keeps readings readable in direct sunlight and dark combiner-box cabinets
RS232 data output lets site engineers build digital acceptance records for owner handover
DC 9V battery supply with approximately 300 hours standby supports full-day field campaigns
Compact handheld body (approx. 1.44 kg) with auxiliary ground rods and test leads in a carry bag
Every unit delivered with its individual factory test report and 12-month warranty
Factory Test & Calibration Report (Per Unit Delivered)
Every XHDJ705 is calibrated at our Xi'an factory before delivery against a JDB-2 ground resistance meter calibration device (accuracy class 0.05, certificate No. DYQ20241014). The sample report below (instrument Serial No. 30130572, test date 2024-04-07) covers the 20Ω, 200Ω and 2000Ω resistance gears and the AC voltage function. Permissible error in all gears: ±(2%rdg+3dgt). All measured items passed, and the whole-machine conclusion is Qualified. A printed test report accompanies each delivered unit for your acceptance file.
Earth Resistance Measurement Results
| Gear | Standard Value | Display Value | Error |
|---|
| 20Ω | 0.11Ω | 0.10Ω | -0.01Ω |
| 20Ω | 0.51Ω | 0.49Ω | -0.02Ω |
| 20Ω | 1.01Ω | 1.02Ω | +0.01Ω |
| 20Ω | 5.01Ω | 5.03Ω | +0.02Ω |
| 20Ω | 15.01Ω | 15.03Ω | +0.02Ω |
| 200Ω | 50.0Ω | 50.1Ω | +0.1Ω |
| 200Ω | 100.0Ω | 100.1Ω | +0.1Ω |
| 200Ω | 150.0Ω | 150.2Ω | +0.2Ω |
| 200Ω | 190.0Ω | 189.5Ω | -0.5Ω |
| 2000Ω | 500Ω | 498Ω | -2Ω |
| 2000Ω | 1000Ω | 998Ω | -2Ω |
| 2000Ω | 1500Ω | 1497Ω | -3Ω |
| 2000Ω | 1700Ω | 1695Ω | -5Ω |
AC Voltage (50Hz) Measurement Results
| Standard Value | Display Value | Error |
|---|
| 10V | 9V | -1V |
| 50V | 49V | -1V |
| 100V | 100V | 0V |
| 300V | 298V | -2V |
| 500V | 498V | -2V |
Routine inspections passed: visual inspection, power-on inspection, display capability, repeatability measurement and display value error test. Report validity: 2024-04-07 to 2025-04-06.
FAQ
Q1: Who typically uses the XHDJ705 ground resistance tester?
Solar PV and wind farm EPC contractors, renewable-energy O&M teams and electrical testing engineers use it to accept and periodically check earthing systems of PV arrays, inverter stations, combiner boxes and wind turbine towers, as well as general industrial earthing.
Q2: How do the 3-wire and 2-wire methods differ?
The precision 3-wire method uses two auxiliary ground rods and follows the fall-of-potential principle, giving the accurate electrode resistance needed for acceptance tests. The simple 2-wire method connects one test lead to a known good earth reference for a fast check when driving auxiliary rods is impractical.
Q3: How accurate is the tester and what proof is included?
Accuracy is ±(2%rdg+3dgt) on all three resistance gears and on the AC voltage function, verified against a calibrated JDB-2 device at our factory. The test data table above is from the actual factory report, and each delivered unit carries its own printed test report.
Q4: Why should I measure earth voltage as well as resistance?
At PV plants and wind farms, unbalanced currents and faults can raise the potential of the earthing system. Measuring AC earth voltage up to 600V before connecting test leads helps you detect dangerous stray voltage and interference, protecting both personnel and measurement validity.
Q5: What are the commercial terms for project orders?
Minimum order quantity is 1 unit. Standard stock orders ship within 5-8 working days, and we accept OEM labeling, customized accessories and bulk project orders. Payment by T/T, with a 12-month warranty and long-term technical support from the Xi'an factory.
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