Power supply

DC 7.4V 1.8Ah rechargeable lithium battery, fully charged and continuous use for about 8 hours

Back light

Controllable white screen backlight, suitable for use in dark places

Measurement

Precision three-wire method and simple two-wire method for measuring grounding resistance

Measurement methods

Two-three-wire method measurement: rated current changing pole method

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

Range

Grounding resistance: 0.000Ω ～ 3000Ω
Ground 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. The auxiliary grounding resistance is 100Ω ± 5%, and the ground voltage is＜5V
2. Additional error when the interference voltage is 5V≤ ± 5% Rdg ± 5dgt
Ground voltage: ± 2% Rdg ± 3dgt (50Hz / 60Hz)

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

Display mode

6-digit large LCD display

Measurement instructions

LED flashing indication during measurement, LCD countdown display

LCD size

128mm×75mm

LCD Display

124mm×67mm

Product size

Host size: about 320mm × 270mm × 145mm

Outer packaging size: 400mm × 245mm × 335mm

Test line

3 bars: red 15m, yellow 10m, green 5m

Simple test line

2 bars: red 1.6m, one black 1.6m

Auxiliary ground rod

2 roots：Φ10mm×150mm

Measure time

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

Measurement times

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

Line voltage

AC measurement below 100V

Communication interface

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

Communication line

One RS232 communication line, 1.5m long

Data retention

"HOLD" symbol indicates when holding data

Data storage

2000 groups, "MEM" storage instruction, the storage is full, display "FULL" symbol

Data access

"READ" symbol indicates when checking data

Overflow display

"OL" symbol indication when over-range overflow

Interference test

Automatically identify the interference signal, and display "NOISE" when the interference voltage is higher than 5V

Alarm function

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

Battery voltage

When the battery voltage drop is insufficient, the battery voltage low symbol is displayed to remind the need for charging.

Automatic shut-down

Automatic shutdown after 15 minutes

Power consumption

Backlight: 25mA Max (separate backlight power consumption)

Standby: 25mA Max (the backlight turns off after turning on)

Measurement: 150mA Max (backlight off)

Weight

Instrument: 2.645kg (including battery)

Total weight: 5.95kg (including packaging)

Tool box

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

Measuring ground resistance: AC-280V / 3 seconds between C-E and P-E ports

Insulation resistance

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

Withstand

AC 3700V / Rms (between instrument panel and cabinet)

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);
JJG366-2004 (Ground resistance meter)