I.Introduction
Earth Resistance Tester is also called double clamp grounding resistance tester. The advanced grounding resistance tester integrates a variety of measurement methods. In addition to the traditional function of ancillary grounding resistance, it also has the unique function of measuring without auxiliary ground. It uses a large LCD gray screen backlight display and microprocessor technology, through the microprocessor control precision 4-wire method, 3-wire method and simple 2-wire method, selection method, double clamp method to measure grounding resistance test. Large-diameter current clamp design, using double jaw measurement technology, without the need to hit the auxiliary ground, without the need to isolate the grounding body and equipment to achieve on-line measurement.Suitable for telecommunications, electricity, meteorology, computer rooms, oil fields, power distribution lines, iron tower transmission lines, gas stations, factory grounding networks, lightning rods and so on. Instrument testing is precise, fast, simple, stable and reliable.
Earth Resistance Tester is controlled by the microprocessor and can accurately detect the grounding resistance, soil resistivity, grounding voltage, DC resistance and AC current. It uses a fast filtering technique to minimize interference. The resistance value of the auxiliary electrode is displayed on the same screen to facilitate the determination of the measurement error due to environmental factors, and it is convenient to measure the true grounding resistance more accurately.At the same time store 500 sets of data,online monitoring data through monitoring software, USB data uploaded to PC and unique features such as intelligent alarm alert.
Earth Resistance Tester consists of host, monitoring software, test line, USB cable, and grounding rod. It has the functions of reading, checking, saving, reporting and printing of historical data.
II. Rang and Accuracy
Test Function | Range | Accuracy | Resolution |
2、3、4 wire method for measuring ground resistance (Re) | 0.00Ω～29.99Ω | ±2%rdg±5dgt(remark 1) | 0.01Ω |
30.0Ω～299.9Ω | ±2%rdg±3dgt | 0.1Ω | |
300Ω～2999Ω | 1Ω | ||
3.00kΩ～30.00kΩ | 10Ω | ||
DC resistance(Re) | 0.0Ω～299.9Ω | ±2%rdg±3dgt | 0.1Ω |
300Ω～2999Ω | 1Ω | ||
3.00kΩ～30.00kΩ | 10Ω | ||
Selection method for measuring ground resistance(Re) | 0.00Ω～29.99Ω | ±2%rdg±5dgt(remark 1) | 0.01Ω |
30.0Ω～299.9Ω | ±2%rdg±3dgt | 0.1Ω | |
300Ω～3000Ω | 1Ω | ||
Double clamp method for measuring ground resistance (Re) | 0.01Ω～0.99Ω | ±10%rdg±10dgt | 0.01Ω |
1.0Ω～9.9Ω | 0.1Ω | ||
10Ω～100Ω | 1Ω | ||
Soil resistivity(ρ) | 0.00Ωm～99.99Ωm | ρ=2πaR (注2) | 0.01Ωm |
100.0Ωm～999.9Ωm | 0.1Ωm | ||
1000Ωm～9999Ωm | 1Ωm | ||
10.00kΩm～99.99kΩm | 10Ωm | ||
100.0kΩm～999.9kΩm | 100Ωm | ||
1000kΩm～9999kΩm | 1kΩm | ||
Ground voltage | AC 0.00～100.0V | ±2%rdg±3dgt | 0.01V |
AC current | AC 0.0mA～1000A | ±2%rdg±3dgt | 0.1mA |
Remark：
1. Reference conditions: accuracy with 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;
2. General Specification
Function | Ground resistance、Soil resistivity、DC resistance、Ground voltage、AC current |
Ambient temperature and humidity | 23℃±5℃，below 75%rh |
Interference voltage | <20V (should be avoided) |
Interference current | <2A (should be avoided) |
Measure R electrode spacing | a＞5d |
Measured ρ electrode spacing | a＞20h |
Power | DC 6V 4.5Ah lead-acid battery lasts more than 100 hours standby |
Backlight | Controllable backlight, suitable for use in dim places |
measurement mode | Precise four-wire、three-wire measurement, simple two-wire measurement、Selection method, double clamp method for measuring grounding resistance |
Measurement methods | 2.3.4-wire method measurement: Polarization method, measuring current 20mA Max Soil resistivity: four-pole method Selectivity Measurement: Polarization Method, Measuring Current 20mA Max Double clamp method: non-contact mutual inductance measurement method, test current 1mA Max DC resistance: polarization method AC current: average rectification (clamp) Ground Voltage: Average Rectification(between S-ES interface) |
Test voltage waveform | Sine wave |
Test frequency | 128Hz |
Short circuit test current | AC 20mA max |
Open circuit test voltage | AC 28V max |
Electrode spacing range | 1m～100m |
Display mode | 4-bit large LCD display, with backlight |
Measurement instructions | LED flashing indicator during measurement |
LCD size | 111mm×68mm |
LCD display field | 108mm×65mm |
Instrument size | L/W/H：277.2mm×227.5mm×153mm |
Clamp size | L/T/H：101mm×27mm×214mm |
Test line | 4 strips：red 15m，black 15m, yellow 10m，green 10m each one |
Simple test line | 2 strips：yellow 1.5m，green 1.5m each one |
Auxiliary Grounding rod | 4 PCS：φ10mm×200mm |
Current clamp | 2 PCS：Banana plug |
Current clamp diameter | φ50mm |
Current clamp lead | Length 2m |
Measure time | AC current：about 2 times/sec; Ground voltage：about 2 times/sec; grounding resistance、soil resistivity: about 7 seconds/time |
Line voltage | Measurement below AC100V (ground voltage measurement function cannot be used to measure commercial power) |
USB interface | With USB interface, storage data can be uploaded to the computer, save and print |
Communication Line | One USB communication line, 1.5m long |
Data storage | 500 groups, "MEM" storage indicates, flashing "FULL" symbol indicates that the memory is full |
Data review | Data review function: "MR" symbol display |
Overflow display | Over-range overflow function: "OL" symbol display |
Current clamp low current indication | When measuring by the selection method or the double-clamp method, when the current signal received by the current clamp A is lower than 0.5 mA, the symbol “ ” is displayed, and at this time, the clamping direction of the current clamp A should be checked. |
Interference test | Automatic identification of interference signals, "NOISE" symbol indication when the interference voltage is higher than 5V |
Auxiliary grounding test | With auxiliary ground resistance test function, 0.00KΩ ~ 30kΩ (Rh max = 3kΩ +100R <50kΩ; Rs max = 3kΩ +100R <50kΩ) |
Alarm function | Alarm when the measured value exceeds the alarm setting value |
Battery voltage | Real-time display of battery power, reminding timely charging when battery voltage is low |
Automatic Shutdown | “APO” Indicates, automatic Shutdown After 15 Minutes |
Power consumption | Standby: 40mA Max(Backlight off) |
Turn on backlight: 43mA Max | |
measuring：120mA Max(Backlight off) | |
Weight | Instrument： 2430g(including battery) |
Current clamp：940g(2 PCS) | |
Test lines：1300g(including simple test line) | |
Auxiliary grounding rod： 850g(4 PCS) | |
Working temperature and humidity | -10℃～40℃；below 80%rh |
Storage temperature and humidity | -20℃～60℃；below 70%rh |
Overload protection | Grounding resistance：AC 280V/3 seconds between H-E and S-ES ports |
Insulation resistance | More than 20MΩ (500V between circuit and housing) |
Pressure resistance | AC 3700V/rms(between circuit and housing) |
Electromagnetic properties | IEC61326(EMC) |
Suitable for safety regulations | IEC61010-1(CAT Ⅲ 300V、CAT IV 150V、pollution level 2)； IEC61010-031； IEC61557-1(grounding resistance)； IEC61557-5(soil resistivity)； JJG 366-2004. JJG 366-2004(ground resistance meter)； JJG 1054-2009(Clamp grounding resistance meter). |
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