ST2241 Grounding resistance Tester/ earth resistance measurement/ soil resistivity meter
1.Basic introduction
Product Name: High Quality Error Small grounding resistance earth tester digital, Multi-function earth resistance clamp meter
Function: grounding resistance, soil resistivity;Ground voltage, AC voltage measurement
Soil Resistivity Range: 0.00Ωm~1kΩm
Resistance Range: 0.00Ω~100.0kΩ
Voltage Range: AC 0.0~600V
Measurement Method: precision four-wire, three-wire measurement, simple two-wire measurement
Line Voltage: measure below AC 100V
Application: ST2241 soil resistivity earth resistance tester is adopted the latest digital and micro-processing technology and can accurately detect ground resistance, soil resistivity, and ground voltage. It uses a fast filtering technique to minimize interference. Displaying the resistance value of the auxiliary electrode in the same screen, which is convenient for judging the measurement error caused by environmental factors, facilitating more accurate measurement of the grounding true resistance value.Widely used in telecommunications, electricity, meteorology, computer rooms, oil fields, power distribution lines, iron tower transmission lines, gas stations, factory grounding networks, lightning rods and so on. The instrument has the characteristics of precise, fast, simple, stable and reliable.
2.Technical Parameters
2.1 Baseline and working conditions
Impact | Benchmark condition | Working conditions | Note |
Auxiliary grounding resistance value | <100Ω | <100kΩ | rC, rP |
Electrode distance when measuring R | a> 5d | a> 5d | ---- |
Electrode distance when measuring ρ | a>20h | a>20h | ---- |
Ambient temperature | 23℃±1℃ | -10℃~40℃ | ---- |
Environment wet crossing | 40% ~ 60% | <80% | ---- |
2.2.General specifications
Function | Two, three or four wires measure ground resistance and soil resistivity;Ground voltage, AC voltage measurement |
Power supply | DC 8.4V (2 rechargeable lithium batteries) |
Range | Ground resistance: 0.00Ω~100.0kΩ |
Soil resistivity: 0.00Ωm ~ 1kΩm (then multiplied by the coefficient 2πa) | |
Measurement method | Precision 4-wire, 3-wire measurement, simple 2-wire measurement of ground resistance |
Short-circuit test current | AC ± 20mA max |
Open circuit test voltage | AC ± 20V max |
Test voltage waveform | square wave (1KHz) |
Electrode pitch range | can be set from 1m to 10m |
Standard test line | 4 strips: 2 strips of 20m length, 2 strips of 10m length |
Simple test lead | 2 strips: 1.0m yellow, 1 each green 1.0m |
Auxiliary ground rod | 4 pieces:φ10mm×150mm |
Line voltage | AC 600V or less |
USB interface | With USB interface, software real-time monitoring, stored data can be uploaded to the computer, save and print, soil layer analysis and other functions |
Communication line | 1 USB cable, 1.5m long |
Auxiliary ground test | With auxiliary ground resistance value test function, but must meet R + rC<50kΩ, R + rP <50kΩ R is the measured ground resistance |
Working temperature and humidity | -10℃~40℃; |
Storage temperature and humidity | -20℃~60℃; |
2.3.Basic error and performance index under reference conditions
Measurement function | Measuring range | Precision | Resolution |
Ground resistance(R) | 0.200Ω~2.000Ω | ±5%rdg±5dgt | 0.001Ω |
02.00Ω~20.00Ω | ±2%rdg±3dgt | 0.01Ω | |
020.0Ω~200.0Ω | ±2%rdg±3dgt | 0.1Ω | |
0200Ω~2000Ω | ±2%rdg±3dgt | 1Ω | |
02.00kΩ~20.00kΩ | ±5%rdg±5dgt | 10Ω | |
Soil resistivity(ρ) | depends on the measurement range of R (ρ=2πa(R÷100) a:1 m~100m;π=3.14) (ρmin = 1.256Ωm , ρmax = 125.6KΩm ) | ||
Ground voltage | AC 0.0~600V | ±2%rdg±3dgt | 0.1V |
Note: 1. When rC or rP is larger, the additional error is ≤ ± 3% rdg ± 5dgt.(rC max<50kΩ; rP max <50kΩ)