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The digital earth resistance tester is designed according to the new lightning protection grounding resistance testing standards, with a short-circuit test current reaching up to 20mA. It uses precise three-wire method or simplified two-wire method for measuring grounding resistance, incorporating FFT (Fast Fourier Transform) technology and AFC (Automatic Frequency Control) technology, offering unique anti-interference capability and environmental adaptability, ensuring strong consistency in repeated tests. It is widely used in power, telecommunications, meteorology, oil fields, construction, lightning protection, and industrial electrical equipment for grounding resistance and grounding voltage measurements.
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The digital earth resistance tester is designed according to the new lightning protection grounding resistance testing standards, with a short-circuit test current reaching up to 20mA. It uses precise three-wire method or simplified two-wire method for measuring grounding resistance, incorporating FFT (Fast Fourier Transform) technology and AFC (Automatic Frequency Control) technology, offering unique anti-interference capability and environmental adaptability, ensuring strong consistency in repeated tests. It is widely used in power, telecommunications, meteorology, oil fields, construction, lightning protection, and industrial electrical equipment for grounding resistance and grounding voltage measurements.
The instrument consists of a main unit, test leads, auxiliary grounding rods, data software, communication cables, etc. The main unit features an integrated toolbox design, made from polypropylene plastic with added new composite fillers, injection molded in one piece, characterized by low density, lightweight, enhanced strength, stiffness, hardness, wear resistance, heat resistance, superior insulation properties, capable of withstanding approximately 200kg of pressure, ensuring high precision, high stability, and high reliability in various environmental tests. The main unit is equipped with a large LCD display, featuring backlight and bar graph indication for clear visibility, capable of storing 2000 sets of data. Through data software, it can achieve functions such as reading, reviewing, saving, reporting, and printing of historical data.
1. Anti-interference: Automatically identifies interference signals; prompts when interference voltage exceeds 5V.
2. Charging reminder: Displays a low battery symbol when the battery voltage drops insufficiently.
3. LCD display with controllable backlight, allowing use in dim environments.
4. USB interface: Equipped with a USB communication interface, stored data can be uploaded to a computer through data software.
5. High-quality case material: The tool box can withstand a weight of up to 200KG.
| Function | Ground resistance, grounding voltage, low-value resistance measurement |
| Power Supply | DC 7.4V 1.8Ah rechargeable lithium battery, continuous use for about 8 hours when fully charged |
| Backlight | Controllable white backlight, suitable for dim environments |
| Measurement Method | Precise three-wire method, simplified two-wire method for measuring ground resistance |
| Measurement Approach | Two/three-wire method measurement: rated current pole-changing method |
| Grounding voltage: average rectified value (between P-E interface) | |
| Range | Ground resistance: 0.000Ω～3000Ω |
| Grounding voltage: AC 0.0～100V (50Hz/60Hz) | |
| Resolution | 0.001Ω; 0.1V |
| Accuracy | Ground resistance: ±2%rdg±0.05Ω (0~30Ω) ±2%rdg±5dgt(30~3000Ω) Note: 1. Auxiliary grounding resistance 100Ω±5%, grounding voltage < 5V 2. Additional error ≤±5%rdg±5dgt at 5V interference voltage |
| Grounding voltage: ±2%rdg±3dgt (50Hz/60Hz) | |
| Test Voltage Waveform | Sine wave |
| Test Frequency | 128Hz/111Hz/105Hz/94Hz (auto frequency selection) |
| Short Circuit Test Current | AC 20mA max |
| Open Circuit Test Voltage | AC 40V max |
| Display Mode | 6-digit large LCD display |
| Measurement Indication | LED flashing during measurement, LCD countdown display |
| LCD Size | 128mm×75mm |
| LCD Display Area | 124mm×67mm |
| Product Dimensions | Main unit dimensions: approximately 320mm×270mm×145mm |
| Outer packaging dimensions: 400mm×245mm×335mm | |
| Test Leads | 3 pieces: red 15m, yellow 10m, green 5m each |
| Simplified Test Leads | 2 pieces: red 1.6m, black 1.6m each |
| Auxiliary Ground Rods | 2 rods: φ10mm×150mm |
| Measurement Time | Grounding voltage: about 2 times/sec; Ground resistance: about 3 sec/time |
| Measurement Times | Over 5000 times (short circuit test, measure once, wait 30 seconds before next measurement) |
| Line Voltage | Measurements below AC 100V |
| Communication Interface | USB interface available, stored data can be uploaded to a computer via data software for saving and printing |
| Communication Cable | USB communication cable 1 piece, length 1.5m |
| Data Hold | "HOLD" symbol indicates data hold |
| Data Storage | 2000 sets, "MEM" storage indicator, "FULL" symbol displayed when storage is full |
| Data Review | "READ" symbol indicates data review |
| Overflow Display | "OL" symbol indicates overflow when exceeding range |
| Interference Test | Automatically identifies interference signals, displays "NOISE" when interference voltage exceeds 5V |
| Alarm Function | "Beep--beep--beep--" alarm prompt when measurement exceeds set alarm value |
| Battery Voltage | Displays low battery symbol when voltage drops, indicating need for charging |
| Auto Power Off | Automatically turns off after 15 minutes of inactivity |
| Power Consumption | Backlight: 25mA Max (backlight power consumption only) |
| Standby: 25mA Max (backlight off after power on) | |
| Measurement: 150mA Max (backlight off) | |
| Weight | Instrument: 2.645kg (including battery) |
| Total weight: 5.95kg (including packaging) | |
| Tool Box | Military tool box design, capable of withstanding up to 200kg |
| Operating Temperature & Humidity | -10℃～40℃; below 80% RH |
| Storage Temperature & Humidity | -20℃～60℃; below 70% RH |
| Overload Protection | Measuring ground resistance: C-E, P-E terminals AC 280V/3 sec |
| Insulation Resistance | Above 20MΩ (between circuit and housing at 500V) |
| Withstand Voltage | AC 3700V/rms (between instrument panel and case) |
| Electromagnetic Characteristics | IEC61326 (EMC) |
| Compliance Standards | IEC61010-1 (CAT Ⅲ 300V, CAT IV 150V, pollution degree 2); IEC61010-031; IEC61557-1 (ground resistance); JJG 366-2004 (ground resistance meter). |
