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Ground/Insulation Resistance Tester

LQ-2571A Earth Resistance Tester - 4-Wire Ground Testing per DL/T 845.2 Standards
  • LQ-2571A Earth Resistance Tester - 4-Wire Ground Testing per DL/T 845.2 Standards

LQ-2571A Earth Resistance Tester - 4-Wire Ground Testing per DL/T 845.2 Standards

The LQ-2571A Earth Tester offers 0.01Ω-30kΩ range with 4-wire measurement, auto interference detection, and 500-data storage. Ideal for power/telecom grounding systems.


  • US$1.00; Negotiated Price
  • Lead time: 30days

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Product Details

Product Tags

LQ-2571A Earth Resistance Tester: Precision Grounding System Analysis

The LQ-2571A Earth Resistance Tester delivers 4-wire measurement accuracy for critical grounding systems in power and telecom networks. With 0.01Ω resolution and automatic interference filtering, it complies with DL/T 845.2-2004 and GB/T 17949.1-2000 standards for substations, towers, and industrial plants.

Product Parameters

Technical parameters

Measuring functionMeasuring rangePrecisionResolution
Ground resistance (R)0.00Ω～30.00Ω±2%rdg±5dgt (Note 1)0.01Ω
30.0Ω～300.0Ω±2%rdg±3dgt0.1Ω
300Ω～3000Ω±2%rdg±3dgt1Ω
3.00kΩ～30.00kΩ±2%rdg±3dgt10Ω
Soil resistivity(ρ)0.00Ωm～99.99Ωmρ=2πaR (Note 2)0.01Ωm
100.0Ωm～999.9Ωm0.1Ωm
1000Ωm～9999Ωm1Ωm
10.00kΩm～99.99kΩm10Ωm
100.0kΩm～999.9kΩm100Ωm
1000kΩm～9999kΩm1kΩm
Ground voltageAC 0.00～600V±2%rdg±3dgt0.01V

Note:

1、Standard condition: Accuracy when Rh Rs<100Ω.

Working conditions: Rh max = 3kΩ+100R < 50kΩ; Rs max = 3kΩ+100R < 50kΩ

2、Depends on the measurement accuracy of R, π=3.14, a:1 m ~ 100m;



General specification

Work and energyTwo, three, four lines to measure ground resistance, soil resistivity;
Grounding voltage and AC voltage measurement
Ambient temperature and humidity23℃±5℃, less than 75%rh
PowerDC 9V 6 LR14 dry battery continuous standby more than 100 hours
Interference voltage< 20V (should be avoided)
Interference current< 2A (should be avoided)
Electrode spacing when measuring Ra＞5d
Electrode spacing when measuring ρa＞20h
Auxiliary grounding resistanceThe base condition is < 100Ω, and the working condition is < 5kΩ
Measuring rangeGround resistance: 0.00Ω to 30.00kΩ
Soil resistivity: 0.00Ωm ~ 9999kΩm
Ground voltage: 0.00V to 600V
Measurement modePrecision 4-wire, 3-wire method measurement, simple 2-wire ground resistance measurement
Measurement methodGround resistance: rated current pole-changing method
Soil resistivity: quadrupole method
Ground voltage: Average rectification (between S-ES interfaces)
Test frequency128Hz
Short-circuit test currentAC > 20mA (sine wave)
Open-circuit test voltageAC 28V max
Electrode spacing rangeCan be set to 1m ~ 100m
ShiftGround resistance: 0.00Ω ~ 30.00kΩ automatic shift
Soil resistivity: 0.00Ωm ~ 9999kΩm automatic shift
BacklightControllable off-white backlight, suitable for use in dim places
Display mode4 digit large LCD display with off-white backlight
Measurement indicationLED flicker during measurement
LCD size111mm×68mm
LCD display field108mm×65mm
Meter size240mm (L)×188mm (W)×85mm (H)
Standard test line4 pieces: red 15m, black 15m, yellow 10m, green 10m each 1 piece
Simple test line2 pieces: yellow 1.5m, green 1.5m each
Auxiliary ground rod4 roots
Measuring timeVoltage to ground: about 3 times/second
Ground resistance, soil resistivity: about 7 seconds/time
Ground voltageAC below 600V measurement (Grounding voltage measurement function cannot be used to measure commercial electricity)
Data storage500 group, "MEM" storage indicator, showing the "FULL" symbol indicates that the storage is full
Data lookupThe "MR" symbol indicates when consulting data
Overflow displayThe "OL" symbol indicates when an overrange overflow occurs
Alarm functionAn alarm is issued when the measured value exceeds the alarm setting value
Battery voltageThe battery low voltage symbol is displayed
Automatic shutdown"APO" indicates that it automatically shuts down after 15 minutes of startup
Power consumptionStandby: Approx. 40mA(backlight off)
Turn on the backlight: about 43mA
Measurement: Approx. 75mA(backlight off)
QualityMeter: 1280g(including battery)
Test line: 1300g
Auxiliary ground rod: 720g(4)
Operating temperature and humidity-10℃ ~ 40℃; Less than 80%rh
Storage temperature and humidity-20℃ ~ 60℃; Below 70%rh
Overload protectionMeasurement Ground resistance: AC 280V/3 seconds between H-E and S-ES ports
Insulation resistanceMore than 20MΩ (500V between circuit and housing)
Withstand voltageAC3700V/rms(between circuit and housing)
Electromagnetic characteristicIEC61326(EMC)
Fit for safetyIEC61010-1(CAT Ⅲ 300V, CAT IV 150V, pollution degree 2);
IEC61010-031;
IEC61557-1(ground resistance);
IEC61557-5(Soil resistivity);
JJG 366-2004;

Key Features

1. Multi-Method Testing

  • 2/3/4-wire measurements: Adapts to site conditions

  • Soil resistivity: Identifies optimal grounding locations

  • Auto electrode check: Validates auxiliary rod connections

2. Advanced Technology

  • Microprocessor-controlled: Real-time interference detection (0-600V)

  • Backlit LCD: Readable in low-light substations

  • Fast filtering: Rejects 50/60Hz grid noise

Technical Specifications

  • Resistance Range: 0.01Ω-30kΩ

  • Voltage Detection: 0.01-600V AC

  • Data Storage: 500 test records

  • Safety Rating: CAT IV 300V

Why Choose LQ-2571A?

  1. Regulatory Compliance: Meets Chinese power/energy standards

  2. Time Savings: 4-wire tests complete 50% faster than 3-wire

  3. Future-Proof: Stores 500 datasets for trend analysis

Includes calibration certificate and 3-year warranty on microprocessor components.

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