Active Member
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[China]
Address: 806, No.24 Nanlian Road, Nanlian Community, Longgang Street, Longgang District, Shenzhen City, 518116 China
Contact name:William Wang
HAOMAI ELECTRIC TEST EQUIPMENT CO.,LTD |
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Multifunctional Ground Resistance Tester
Model: GRT-200
Multifunctional Ground Resistance Tester GRT-200 is designed to measure ground resistance by four-wire method, three-wire method or two-wire method, as well as measure soil resistivity.
Technical Data
| Function | measure ground resistance by four-wire, three-wire or two-wire method, measure soil resistivity, measure ground voltage and AC voltage |
| Ambient temperature and humidity | 23℃±5℃, 75%rh below |
| Power supply | DC 6V/4.5Ah lead-acid battery, last more than 100 hours for standby |
| Interference voltage | <20V (should be avoided) |
| Interference current | <2A (should be avoided) |
| Electrode spacing during R measurement | a＞5d |
| Electrode spacing during ρ measurement | a＞20h |
| Auxiliary ground impedance | reference condition <100Ω, working condition <5kΩ |
| Measurement Range | Ground resistance: 0.00Ω~30.00kΩ |
| Soil resistivity: 0.00Ωm~9999kΩm | |
| Ground voltage: 0.00V~100.0V | |
| Measurement mode | Precise four-wire or three-wire measurement, simple two-wire measurement |
| Measurement method | Ground resistance: rated current and pole changing method Soil resistivity: four-pole method Ground voltage: average rectification(S-ES between interface) |
| Test frequency | 128Hz |
| Short circuit test current | > 20mA (sine wave) |
| Open circuit test voltage | AC 28V max. |
| Electrode spacing range | 1m~100m can be set |
| Gear change | Ground resistance: fully automatic shifting 0.00Ω~30.00kΩ |
| Soil resistivity: fully automatic shifting 0.00 Ωm~9999kΩm | |
| Backlight | controllable gray screen backlight, suitable for use in dim places |
| Display mode | 4-bit large LCD display, gray screen backlight |
| Measurement instructions | LED flashing indicator during measurement |
| LCD size | 111mm×68mm |
| LCD display field | 108mm×65mm |
| Instrument dimensions | LxWxH: 277.2mm×227.5mm×153mm |
| Standard test leads | 4 pcs: red 15m, black 15m, yellow 10m, green 10m |
| Simple test leads | 2 pcs: yellow 1.6m, green 1.6m |
| Auxiliary Ground rod | 4 pcs: φ10mm×200mm |
| Measuring time | Ground voltage: about 3 times/sec. |
| Ground resistance / soil resistivity: about 7 sec./time | |
| Line voltage | Measurement below AC100V (ground voltage measurement function can not be used to measure commercial power) |
| USB interface | With USB interface, software monitoring, storage data can be uploaded to the computer for saving and printing. |
| Communication cable | 1 pc USB communication cable, length: 1.5m |
| Data storage | 500 data set. "MEM" is storage indicator, "FULL" symbol indicates that the memory is full. |
| Data query | "MR" symbol appears |
| Overflow display | Over-range overflow function: "OL" symbol appears. |
| Interference test | Automatic identification of interference signals. "NOISE" symbol indicates when the interference voltage is higher than 5V. |
| Auxiliary ground test | With auxiliary ground impedance test function, 0.00KΩ ~ 30kΩ (Rh max = 3kΩ +100R <50kΩ, Rs max = 3kΩ +100R <50kΩ) |
| Alarm function | Give 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” symbol appears, automatic shutdown after 15 minutes |
| Power consumption | Standby: 40mA(backlight off) |
| Turn on backlight: about 43mA | |
| Working: 75mA(backlight off) | |
| Weight | Instrument: 2.45 kg(including battery) |
| Test leads:1.3 kg | |
| Auxiliary ground rod: 0.85 kg(4pcs) | |
| Working temperature and humidity | -10℃～40℃, 80%rh below |
| Storage temperature and humidity | -20℃～60℃, 70%rh below |
| Overload protection | Ground impedance measurement: AC 280V/3 seconds between H-E and S-ES ports |
| Insulation test | 20MΩ above(500V between circuit and case) |
| Withstand voltage | AC 3700V/rms(between circuit and case) |
| EMC | IEC61326 |
| Safety | IEC61010-1(CAT Ⅲ 300V, CAT IV 150V, pollution level 2) IEC61010-031 IEC61557-1(ground impedance) IEC61557-5(soil resistivity) JJG 366-2004 |
Measuring Rang and Accuracy
| Test Function | Range | Accuracy | Resolution |
| Ground resistance (R) | 0.00Ω～30.00Ω | ±2%rdg±5dgt (Note1) | 0.01Ω |
| 30.0Ω～300.0Ω | ±2%rdg±3dgt | 0.1Ω | |
| 300Ω～3000Ω | ±2%rdg±3dgt | 1Ω | |
| 3.00kΩ～30.00kΩ | ±2%rdg±3dgt | 10Ω | |
Soil Resistivity(ρ)
| 0.00Ωm～99.99Ωm | ρ=2πaR (Note 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 |
Note 1: Reference conditions: accuracy with Rh Rs < 100Ω
Working conditions: Rh max＝3kΩ+100R＜50kΩ, Rs max＝3kΩ+100R＜50kΩ
Note 2: It depends on the measurement accuracy of R.
π=3.14, a: 1 m~100m
Multifunctional Ground Resistance Tester GRT-200 is ideal instrument for measuring ground resistance and soil resistivity.
