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Product Introduction

Product measurement method：

1. Simple grounding resistivity test on two wires

Second-line test: this method is not to use the simple measuring method of auxiliary grounding rods, using existing minimum grounding resistance of grounding as auxiliary grounding, use two simple test line connection (i.e., G (H) - P (S) interface sub, E - ES interface sub) can use metal hose, fire hydrant metal buried objects, such as commercial common ground of the power system or building lightningproof grounding pole instead of auxiliary grounding rods C (H), P (S), when measuring the attention to remove the selected metal oxide layer of auxiliary grounding body connection point.

2. Three-wire test ground resistivity

Three gauge test: short connected instrument's ES, E interface, namely three-wire test, the instrument operation is the same as four-wire test.Three-wire test cannot eliminate the influence of wire resistance on the measurement, nor can it eliminate the influence of the change of contact resistance between the instrument and the test line or between the test line and the auxiliary ground rod. The oxide layer on the surface of the ground body to be measured should be removed during the measurement.

3. Four-wire test ground resistivity

Four-wire test: Four-wire test can eliminate the influence of contact resistance (usually dirt or rust) between the ground body under test, auxiliary ground rod, test clip and the surface of instrument input interface on measurement, and can eliminate the influence of wire resistance on measurement, which is better than three-wire test.

Generally, P(S) and C(H) auxiliary grounding rods are buried deep in the ground in a straight line at an interval of 5m ~ 20m from the object under test. The grounding test wires (black, green, yellow and red) are connected to the grounding pole E, auxiliary voltage pole P(S) and auxiliary current pole C(H) from the interfaces E, ES, P(S) and C(H) of the instrument.

Precautions for product use：

Choose sunny and dry weather. In case of thunderstorm, stop the test and evacuate the test site.
In the permafrost area, the test electrode is driven below the freezing line.
Where there are underground pipes, the electrodes are arranged in the vertical direction of the pipe, and the distance between the nearest measuring electrode and the underground pipe is required to be no less than the electrode distance.
Select multiple measuring points for stratification measurement.

product Parameter

Application environment
Ambient temperature	-10℃ ~40℃
Environmental wetness	<80%
Working voltage of the instrument	9v±1.5V
Auxiliary grounding resistance value	< 30kΩ
Interference voltage	<20V
Interference current	<2A
Electrode spacing when Measuring R	a>5d
Electrode spacing when measuring ρ	a> 20h

Electrical parameters
Power supply	DC 9V(alkaline dry battery LR14 1.5V 6, continuous standby 300 hours)
Grounding resistance	0. 00 Ω ~ 30.00 kΩ
Soil resistivity	2.3 0. 002 Ω ~ 9000 kΩ
Grounding voltage	0V~600V
Measurement methods	Precise 4-wire, 3-wire measurement and simple 2-wire measurement of ground resistance
Test frequency	128Hz/111Hz/ 105Hz/94Hz (AFC)
Short circuit test current	AC 20mA Max
Open circuit test voltage	AC 40V Max
Test voltage waveform	sine wave

We will serve new and old customers wholeheartedly with high-quality Earth Resistance/Soil Resistivity Tester IEC61010-031, IEC61557-1 Ground Resistance Meter IEC61557-5 Soil Resistivity Meter and excellent reputation to make a contribution to the better life of mankind. We always adhere to the business philosophy of 'integrity, efficiency, innovation, and win-win', and hope to establish long-term safe, honest and effective cooperative relations with buyers all over the world. Through self technological innovation and product innovation to expand production capacity and expand product market scale, our company has achieved the win-win goal of profit and scale of all parties in the joint venture.

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