Power supply

DC 7.4V 1.8Ah rechargeable lithium battery, the battery is about 8.4V

Backlight

Controllable white screen backlight, suitable for use in dark places

Measurement

Precision 4-wire, 3-wire method measurement, simple 2-wire measurement of grounding resistance

Measurement method

Grounding resistance: rated current changing pole method, measuring current 20mA Max

Soil resistivity: quadrupole method (Wenner method)

Voltage to ground: average rectification (between P (S) -ES interface)

Range

Two, three, four wire method to measure grounding resistance (R): 0.000Ω ～ 300,000Ω

Soil resistivity (Ρ): 0.00Ωm～9000kΩm

Ground voltage: AC 0.0～100.0V

Precision

Two, three, four wire method to measure grounding resistance (R):

± 2% Rdg ± 5dgt (0.000Ω～29.999Ω)

± 2% Rdg ± 3dgt (30.00Ω～2999.9Ω)

± 4% Rdg ± 3dgt (3000Ω～300000Ω)

Soil resistivity (Ρ): according to the measurement accuracy of R (Ρ=2πaR A: 1 M～100m; Π=3.14)

Ground voltage: ± 2% Rdg ± 3dgt

Note: 1. The additional error when RC Max or RP Max is ≤ ± 5% Rdg ± 5dgt. (RC Max: 4kΩ + 100R＜50kΩ, RP Max: 4kΩ + 100R＜50kΩ)

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

Test voltage waveform

Sine wave

Test frequency

128Hz/111Hz/105Hz/94Hz (automatic frequency selection)

Short circuit test current

AC 20mA Max

Open circuit test voltage

AC 40V Max

Electrode spacing

1m～100m

Gear shift

Grounding resistance: 0.000Ω～300,000Ω automatic gear shift

Soil resistivity: 0.00Ωm ～ 9000kΩm automatic gear shift

LCD

6-digit LCD display, white screen backlight

LCD size

128mm × 75mm

LCD display field

124mm × 67mm

Measurement instructions

LED flashing indication during measurement, LCD countdown, progress bar graph indication

Charging instructions

The indicator light on the charger lights red when charging, and lights green when fully charged

Size

Instrument size: length, width and height 320mm×275mm×145mm

Outer packing size: 400mm×245mm×335mm

Standard test line

4 bars: red 15m, black 15m, yellow 10m, green 10m each

Simple test line

2 bars: red 1.6m, one black 1.6m each

Auxiliary ground rod

4 pieces: Φ10mm×150mm

Measure time

Ground voltage: about 2 times/second; ground resistance: about 7 seconds/time; soil resistivity: about 7 seconds/time

Measurement times

More than 5000 times (short circuit test, test once, stop for 30 seconds and then test)

Line voltage

Measurement below AC 600V

Communication Interface

With RS232 interface, the stored data can be uploaded to the computer, saved and printed

Communication line

RS232 communication line, 1.5m 1 piece

Data retention

"HOLD" symbol indicates when holding data

Data storage

2000 groups, "MEM" storage indication, display "FULL" indicates that the storage is full

Data access

"READ" symbol indicates when checking data

Overflow display

"OL" symbol indication when over-range overflow

Interference test

Automatically identify the interference signal, the interference voltage is higher than 5V "NOISE" symbol indication

Auxiliary ground test

With auxiliary earth resistance test function, 0.00kΩ～30.00kΩ (100R + RC <50kΩ, 100R + RP <50kΩ)

Alarm function

When the measured value exceeds the alarm setting value, "beep--beep--beep--" alarm prompt

Battery voltage

When the battery voltage is insufficient, the battery voltage low symbol is displayed to remind the battery to charge.

Automatic shut-down

Automatic shutdown after 15 minutes

Working current

Standby: 25mA Max (backlight off);

Backlight: 25mA Max (separate backlight power consumption);

When measuring: 150mA Max (backlight off)

Quality

Instrument: 2.66kg (including battery)

Total mass: 6.88kg (including packaging)

Tool box

Special toolbox design, can bear 200kg

Working temperature and humidity

-10 ℃～40 ℃; below 80% Rh

Storage temperature and humidity

-20 ℃～60 ℃; below 70% Rh

Overload protection

Measurement of grounding resistance: AC 280V/3 seconds between C (H) -E, P (S) -ES ports

Insulation resistance

20MΩ or more (500V between circuit and case)

Withstand

AC 3700V / Rms(between circuit and case)

Electromagnetic characteristics

IEC61326(EMC)

Suitable for safety regulations

IEC61010-1 (CAT Ⅲ 300V, CAT IV 150V, pollution degree 2);

IEC61010-031; IEC61557-1 (ground resistance); IEC61557-5 (soil resistivity); JJG 366-2004 (ground resistance meter)