power supply

DC 7.4V 1.8Ah Rechargeable Lithium Battery

Backlight

Controllable white backlight, suitable for use in dimly lit environments.

Measurement Method

Ground resistance measurement using the precise four-wire and three-wire methods, simplified two-wire method, selective method, and dual-clamp method.

Measurement Method

2-/3-/4-Wire Measurement: Polarity Reversal Method; Short-circuit Measurement Current: 20 mA Max.

Selective Measurement: Polarity Reversal Method; Short-circuit Measurement Current: 20 mA Max.

Dual-Clamp Method: Non-contact Mutual Inductance Measurement; Test Current: 1 mA Max.

Soil Resistivity: 4-Pole Method (Wenner Method)

DC Resistance: Polarity Reversal Method

AC Current: Average Value Rectification (Clamp-type)

Voltage to Ground: Average Value Rectification (Between P(S) and ES Terminals)

Measurement Range

Ground Resistance (Re) and DC Resistance Measurement (2-, 3-, and 4-Wire Methods): 0.000 Ω – 30,000 Ω

Selective Method for Measuring Ground Resistance (Re): 0.00 Ω – 3000 Ω

Ground Resistance (Re) Measurement (Dual-Clamp Method): 0.01 Ω – 200 Ω

Soil Resistivity (ρ): 0.00 Ω·m – 9000 kΩ·m

Ground Voltage (50 Hz/60 Hz): AC 0.0–100.0 V

AC Current (50Hz/60Hz): AC 0.00 mA – 600.0 A

Maximum Resolution

2-, 3-, and 4-Wire Method for Measuring Ground Resistance (Re) and DC Resistance:

0.001 Ω (0.000 Ω – 29.999 Ω)

0.01 Ω (30.00 Ω – 299.99 Ω)

0.1 Ω (300.0 Ω – 2999.9 Ω)

1 Ω (3000 Ω – 30000 Ω)

Selective Method for Measuring Ground Resistance (Re):

0.01 Ω (0.00 Ω – 29.99 Ω)

0.1 Ω (30.0 Ω – 299.9 Ω)

1 Ω (300 Ω – 3000 Ω)

Ground Resistance (Re) Measurement (Dual-Clamp Method):

0.01 Ω (0.01 Ω – 0.99 Ω)

0.1 Ω (1.0 Ω – 29.9 Ω)

1 Ω (30 Ω – 200 Ω)

Soil resistivity (ρ):

0.01Ωm (0.00Ωm～99.99Ωm)

0.1Ωm (100.0Ωm～999.9Ωm)

1Ωm（1000Ωm～9999Ωm）

10Ωm（10.00kΩm～99.99kΩm）

100Ωm (100.0kΩm～999.9kΩm)

1kΩm (1000kΩm～9000kΩm)

Ground Voltage (50 Hz / 60 Hz): 0.1 V

AC Current (50 Hz / 60 Hz): 0.01 mA

Precision

2-, 3-, and 4-Wire Method for Measuring Ground Resistance (Re) and DC Resistance (R—):

±2% rdg ±0.05 Ω (0.000 Ω – 29.999 Ω)

±2% rdg ±3 dgt (30.00 Ω – 299.99 Ω)

±2% rdg ±3 dgt (300.0 Ω – 2999.9 Ω)

±4% rdg ±3 dgt (3.000 kΩ – 30.00 kΩ)

Note: 1. Additional error at rC max or rP max: ≤ ±5% rdg ±5 dgt. (rC max: 4 kΩ + 100R < 50 kΩ; rP max: 4 kΩ + 100R < 50 kΩ)

2. Additional error at 5 V interference voltage: ≤ ±5% rdg ±5 dgt.

Selective Method for Measuring Ground Resistance (Re):

±2% rdg ±5 dgt (0.00 Ω – 29.99 Ω)

±2% rdg ±3 dgt (30.0 Ω – 299.9 Ω)

±2% rdg ±3 dgt (300 Ω – 3000 Ω)

Ground Resistance (Re) Measurement (Dual-Clamp Method):

±10% rdg ±5 dgt (0.01 Ω – 100 Ω)

±20% rdg ±5 dgt (101 Ω – 200 Ω)

Soil Resistivity (ρ): Determined by the measurement accuracy of R.

(ρ = 2πaR; a: 1 m – 100 m; π = 3.14)

Ground Voltage (50 Hz/60 Hz): ±2% rdg ±3 dgt

AC Current (50 Hz/60 Hz): ±2% rdg ±3 dgt

Test Voltage Waveform

Sine wave

Test Frequency

128 Hz / 111 Hz / 105 Hz / 94 Hz (Auto-selection)

Short-Circuit Test Current

AC 20mA max

Open-Circuit Test Voltage

AC 40V max

Electrode Spacing Range

1m～100m

Display Mode

6-digit extra-large LCD display with backlight

Measurement Instructions

LED flashing indication during measurement; LCD countdown display.

LCD Size

128mm×75mm

LCD Display Area

124mm×67mm

Equipment Dimensions

Instrument Dimensions (L×W×H): Approx. 320 mm × 275 mm × 145 mm

Current Clamp Dimensions (L×W×H): Approx. 220 mm × 100 mm × 27 mm

Package Dimensions

Outer Packaging Dimensions (L×W×H): Approx. 400 mm × 245 mm × 335 mm

Test Line

One strand each: 15m red, 15m black, 10m yellow, and 10m green.

Simple Test Lead

2 pieces: One red (1.6m) and one black (1.6m).

Auxiliary Ground Rod

4 rods: φ10 mm × 150 mm

Current Clamp

2 Clamps: One CT1 clamp with red and black plugs, and one CT2 clamp with blue and black plugs.

Current Clamp Jaw Diameter

φ52mm

Current Clamp Turns Ratio

1000：1

Current Clamp Leads

Length: 2 m

Measurement Time

AC Current: Approx. 2 times/second

Voltage to Ground: Approx. 2 times/second

Grounding Resistance: Approx. 7 seconds/measurement

Number of measurements

Over 5,000 cycles (Short-circuit test: test once, pause for 30 seconds, then test again)

Line Voltage

Measurement of AC 100V or Below

Communication Interface

Equipped with a USB interface, allowing stored data to be uploaded to a computer via software.

Communication Cable

1 USB communication cable, 1.5m in length.

Data Retention

"HOLD" Symbol Indication During Data Retention

Data Storage

2000 sets; "MEM" storage indicator; displays the "FULL" symbol to indicate that storage is full.

Data Lookup

"READ" Symbol Indication During Data Retrieval

Overflow Display

"OL" Symbol Indication for Over-range Overflow

Current Clamp Low Current Indication

When performing measurements using the selective method or the dual-clamp method, if the current signal received by Clamp CT2 falls below 0.5 mA, the clamping direction of the CT2 current clamp should be checked.

Interference Testing

Automatically identifies interference signals; the "NOISE" symbol indicates when the interference voltage exceeds 5V.

Auxiliary Grounding Test

Features an auxiliary ground resistance measurement function: 0.00 kΩ – 30.00 kΩ (100R + rC < 50 kΩ, 100R + rP < 50 kΩ).

Alarm Function

When the measured value exceeds the alarm setpoint, a "beep—beep—beep—" alarm sounds.

Battery Voltage

When the battery voltage is insufficient, the low battery voltage symbol is displayed to indicate that the battery needs to be charged.

Automatic Shutdown

Automatically shuts down 15 minutes after powering on.

Power Consumption

Backlight: 25 mA Max (Backlight power consumption only)

Standby: 25 mA Max (Backlight off after power-on)

Measurement: 150 mA Max (Backlight off)

quality

Main Unit: 2.66 kg (including battery)

Total Weight: 7.87 kg (including test leads, ground rods, and packaging)

tool box

Military-grade toolbox design, capable of supporting a load of 200 kg.

Operating Temperature and Humidity

-10°C to 40°C; below 80% RH

Storage Temperature and Humidity

-20°C to 60°C; below 70% RH

Overload Protection

Ground Resistance Measurement: AC 280 V / 3 seconds between ports C(H)-E and P(S)-ES.

Insulation Resistance

20 MΩ or greater (between circuit and housing at 500 V)

Withstand Voltage

AC 3700 Vrms (between circuit and enclosure)

Electromagnetic Characteristics

IEC61326(EMC)

Compliant with Safety Standards

IEC 61010-1 (CAT III 300V, CAT IV 150V, Pollution Degree 2);

IEC 61010-031; IEC 61557-1 (Earth Resistance);

IEC 61557-5 (Soil Resistivity); JJG 366-2004 (Earth Resistance Meters);

JJG 1054-2009 (Clamp-on Earth Resistance Testers).