Dual Clamps Earth Resistance Tester
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INTRODUCTION
| MEWOI4300D Dual clamps Earth resistance tester is specially designed and manufactured for on-site measurement of grounding resistance, soil resistivity, grounding voltage, grounding line leakage current, AC current and DC resistance. Apply digital processing technology, precision 4-wire method, 3-wire method and simple 2-wire method, selection method, double-clamp method to measure grounding resistance, Large caliber current clamp design, can measure the grounding system which using large grounding down lead.It can flexibly and accurately measure arbitrary grounding resistance values of single point and mesh grounding and other complex grounding conditions. When measuring parallel grounding, it is unnecessary to disconnect any parallel grounding electrode to maximize the convenience of measurement. Import FFT (fast Fourier transform) technology, AFC (automatic frequency control) technology, with unique anti-interference ability and environment adaptability, to ensure that long time measurement of high precision, high stability and reliability, The tester case is made of waterproof protection box, anti-collision, anti-drop, waterproof (protection grade IP65), strong and durable, and also equipped with a large-capacity rechargeable lithium battery pack, especially suitable for outdoor construction, which widely used in grounding resistance, soil resistivity, earth voltage, AC current and leakage current measurement of electric power, telecommunications, meteorology, oil fields, construction, lightning protection and industrial electrical equipment etc. |
Reference Conditions And Working Conditions
Influence Constant | Base Condition | Working Conditions | Remark |
Ambient Temp | 23℃±1℃ | -10℃-40℃ | / |
Ambient Humidity | 40%-60% | ＜80% | / |
Working Voltage | 7.8V±0.1V | 7.8V±0.6V | / |
Auxiliary Earth Resistance Value | ＜100Ω | ＜30kΩ | / |
InterferenceVoltage | Should Avoid | ＜20V | / |
InterferenceCurrent | Should Avoid | ＜2A | / |
Electrode Distance of measuring R | a＞5d | a＞5d | / |
Electrode Distance of measuring ρ | a＞20h | a＞20h | / |
Technical Specifications
Function | Measurement of earth resistance, soil resistivity; DC resistance, earth voltage,AC current, leakage current |
Power Supply | DC 8.4V (rechargeable battery, continues standby 300 hours) |
Backlight | Controllablescreen backlight, suitable for dim places |
Measuring Mode | Precise 4-wire measurement, 3-wire measurement, simple 2-wire measurement, selection method, double clamp method to measure grounding resistance |
Measuring Method | 2/3/4 pole measurement method: Change-pole method, measurement current 20mA Max Selection measurement method: Change-pole method, measurement current 20mA Max Double clamp measurement method: Non-connect mutual inductance method, measurement current 1mA Max Soil Resistivity: 4-pole measurement (Wenner method) DC resistance: Change-pole method AC current: Mutual inductance method(clamp) Earth Voltage: Average rectification(betweenP(S)-ES) |
Test Voltage Wave | Sine wave |
Test Frequency | 128Hz/111Hz/105Hz/94Hz(AFC) |
Short-circuit Test Current | AC 20mA max |
Open-circuit Test Current | AC 40V max |
Electrode DistanceRange | 1m-100m |
Display Mode | 4-digital large LCD display, with screen backlight |
Measuring Indication | During measurement, LED flash indication, LCD count down display |
LCD Frame Dimension | 128mm×75mm |
LCD Display Area | 124mm×67mm |
Tester Dimension | 280mm(L)×260mm(W)×160mm(H) |
CT Size | 185mm(L)X115mm(W)X43mm(H) |
Test Wire | 4PCS: red 20m, black 20m, yellow 10m, and green 10m |
Simple Test Wire | 2PCS: red 1.6m and black 1.6m |
Auxiliary Grounding Rod | 4PCS:Φ10mm×150mm |
Current Clamp | 2PCS :1 blue-black plug and 1 red-blackplug |
Clamp Caliber | Φ68mm |
Clamp Turn Ratio | 1000:01:00 |
Current Clamp Lead Wire | 2m |
Measurement Time | AC current: about 2 times/second |
Voltage to earth: about 2 times/second | |
Earth resistance: about 7 seconds/time | |
Measurement Times | Over 5000 times (Short-circuit test, interval time should be at least 30seconds) |
Line Voltage | Below AC 600V measure |
Communication Interface | RS232 interface, storage data can be uploaded to computer, saved or printed. |
Communication Cable | RS232 communication cable 1pcs, length 1.5m |
Data Hold | Data hold function: “HOLD” symbol display |
Data Storage | 2000 sets, “MEM” storage indication, “FULL” symbol flash display indicate that storage full |
Data Access | Data access function: “READ” symbol display |
Overflow Display | Exceed measure range overflow function: “OL” symbol display |
Current Clamp Low Current Indication | Measurement with selection method or double clamp method, the current signal received by CT2 is lower than 0.5mA,will display““, and should check the clamping direction of the CT2 current clamp |
Interference Test | Automatic identification of interference signals,“NOISE”symbol indication when the interference voltage is higher than 5V |
Auxiliary Grounding Test | With auxiliary grounding resistance test function, 0.00KΩ-30kΩ(100R+rC<50kΩ, 100R+rP<50kΩ) |
Alarm Function | Measurement value exceeds alarm setting value, will "Toot-toot-toot" alarm hint |
Battery Voltage | While battery voltage decreases to around 7.2V, will display low battery voltage symbol, and reminding to replace the battery |
Auto-shut off | Automatically shut down after 15 minutes of booting up without any operation |
Working Current | Backlight: 25mA Max(only backlight power consumption) |
Standby:25mA Max(Backlight close after power on) | |
Measurement:150mA Max(Backlight close) | |
Weight | Tester:2230g |
Tester package: 915g | |
Current Clamp: 1050g(2pcs) | |
Test wires: 1560kg(include the simple test wires) | |
Auxiliary grounding rods: 935kg(4pcs) | |
Working Temperature & Humidity | -10℃-40℃, below 80%rh |
Storage temperature & humidity | -20℃-60℃, below 70%rh |
Protection Level | IP65(close the case) |
Overload Protection | Measure earth resistance: between each interfaces ofC(H)-E、P(S)-ES,AC 280V/3 seconds |
Insulation Resistance | Over 20MΩ(betweencircuit and shell 500V) |
Withstanding Voltage | AC 3700V/rms. (Between circuit and shell) |
Electromagnetic Features | IEC61326(EMC) |
Protection Type | IEC61010-1(CATⅢ300V、CAT IV 150V、Pollution 2); IEC61010-031; IEC61557-1(Earth resistance); IEC61557-5(Soil resistivity); JJG 366-2004(Grounding resistance meter) JJG 1054-2009(Clamp grounding resistance meter) |
Intrinsic error and performance indicators under base conditions
Measurement Function | Measurement Range | Intrinsic Error | Resolution |
2/3/4 pole method measure earth resistance(Re) DC resistance(R--) | 0.00Ω-29.99Ω | ±2%rdg±5dgt | 0.01Ω |
30.0Ω-299.9Ω | ±2%rdg±3dgt | 0.1Ω | |
300Ω-2999Ω | ±2%rdg±3dgt | 1Ω | |
3.00kΩ-30.00kΩ | ±4%rdg±3dgt | 10Ω | |
Selection method measure grounding resistance(Re) | 0.00Ω-29.99Ω | ±2%rdg±5dgt | 0.01Ω |
30.0Ω-299.9Ω | ±2%rdg±3dgt | 0.1Ω | |
300Ω-3000Ω | ±2%rdg±3dgt | 1Ω | |
Double clamp method measure grounding resistance(Re) | 0.01Ω-0.99Ω | ±10%rdg±5dgt | 0.01Ω |
1.0Ω-29.9Ω | 0.1Ω | ||
30Ω-100Ω | 1Ω | ||
Soil Resistivity (ρ) | 0.00Ωm-99.99Ωm | Accuracy:According to the precision ofR (ρ=2πaR, a:1 m-100m,π=3.14) | 0.01Ωm |
100.0Ωm-999.9Ωm | 0.1Ωm | ||
1000Ωm-9999Ωm | 1Ωm | ||
10.00kΩm-99.99kΩm | 10Ωm | ||
100.0kΩm-999.9kΩm | 100Ωm | ||
1000kΩm-9000kΩm | 1kΩm | ||
Earth Voltage(50Hz/60Hz) | AC 0.0-100V | ±2%rdg±3dgt | 0.1V |
Alternatingcurrent(50Hz/60Hz) | 0.0mA-600.0A | ±2%rdg±3dgt | 0.01mA |
Accessories
| Host | 1 |
| Handbag | 1 |
| USB Cable | 1 |
| Power Adapter | 1 |
| Grounding Rod | 2 |
| Simple Line | 2 |
| Current Clamp | 2 |
| 20M Test Wire | 2 |
| 10M Test Wire | 2 |
