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ST4106 Earth Resistance & Resistivity Tester

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  • ST4106
ST4106 Earth Resistance & Resistivity Tester
 
Earth Resistance Measurements with 4, 3 and 2 Wires
Earth Resistivity (ρ) Measurement using WENNER method
 
* Test resolution of 0.003Ω on 200kΩ range
* Advanced Filtering method (based on FFT Fast Fourier Transform) reduces noise interference for obtaining stable measurements.
* Automatic and Manual selection of the Test Current Frequency in four bands (94/105/111/128Hz). In Automatic mode, ST 4106 will select the most suitable Frequency.
* Several sub-results can be shown on the display: Resistance of the Auxiliary Earth Spikes, Frequency of Test Current, Voltage and Frequency of Interference (noise), Residual Resistance Rk, etc.
* Warning for excessive noise and high Auxiliary Earth Spikes resistance.
* Large Graphic Display with backlight for readings in poorly illuminated areas.
* Up to 999 measurement results can be saved in the memory and recalled on the display.
* The stored results can be transferred to a PC using software and a USB adaptor which are not included.
 
Earth Resistance Measurement
1: Earth resistance measurement with 4, 3 and 2wires and six ranges covering measurements from 0.03Ω to 200kΩ.
2: Also ideal for large earthing systems by the considerable test current of 20mA (max) yield-ing a high resolution of 0.001Ω on 2Ω range. 
3: Advanced Filtering method (based on “FFT” Fast Fourier Transform) reduces noise interference for obtaining stable measurements.
4: Warnings for excessive noise and high Auxiliary Earth Spikes resistance.
 
Earth Resistance Measurements with 4, 3 and 2 Wires
2 3 4

Earth Resistivity Measurement
* The earth resistivity measurement is useful for soil surveys to establish the optimum earth electrode system design and site, to avoid extra cost of re-working electrode installations. It can be also suitable for geological investigations.
* Earth resistivity measurement is automatically calculated after having set the distance between Auxiliary Earth Spikes.
 
Measurement Method for Earth Resistivity (ρ)
p
Stick the four Auxiliary Earth Spikes into the ground deeply. They should be aligned at an interval of 1-100m. The depth should be 5% or less of the interval between the spikes.

Software
The stored results can be transferred to a PC via USB adaptor.
* Up to 999 measurement results can be saved in memory.
* Data can be converted to CSV files.
 
pc
Specification
2-Pole/3-Pole/4-Pole Earth Resistance Measurement
Range Resolution Measuring range Accuracy
2 Ω 0.001 W 0.0032.099 W ±(3% + 5dgt)
20 W 0.01 W 0.0320.99 W ±(2% + 5dgt)
200 W 0.1 W 0.1209.9 W
2000 W 1 W 12099 W
20 KW 0.01 KW 0.0120.99 KW
200 KW 0.1KW 0.01200.9 KW ±(5% + 5dgt)
 
Measure Resistance Coefficient “ r
Range Measuring range Accuracy
2 W 0.18 Ω.m 1.318 KΩ.m ρ2×Π×a×Rg
20 W 0.18 Ω.m 13.18 KΩ.m
200 W 0.62 Ω.m 131.8 KΩ.m
2000 W 6.28 Ω.m 1318 KΩ.m
20 KW 62.80 Ω.m 1999 KΩ.m
200 KW 628.8 Ω.m 1999 KΩ.m
 
Value Range of Rh & Rs
Value Range of Rh & Rs Precision
Re<1.00Ω 2kΩ ±5%rdg.±1%fs5
1.00Ω≤Re<2.00Ω 3.5kΩ
2.00Ω≤Re =Rex100+5kΩ
Rh,Rs<100kΩ
 
Measure Interference Voltage
Items Measuring Range Tolerance Precision
Interference Voltage (Ust) 50.0 V 0.1v ±(2% + 2)
Frequency of Interference Voltage (Fst) 16Hz ~500 Hz 0.1Hz ±(1% + 0.5Hz)
 
Safety Standards
This instrument is in compliance with EN61010, EN61557-1 & EN61557-5
Insulation Level : II, double-insulated
Pollution Level: 2
Maximum Altitude  2,000m
Overvoltage Level: CAT III 250V (firewire VS earth wire)
 
Basic Features
Dimensions: 270 (length) x 190 (width) x 80 (height) mm
Weight (including batteries): Approx. 1,700g
 
Power Supply
Batteries: 8 pcs batteries (1.5 V – R14G – SIZE C)
Low battery:The battery power is running out when appears.
Battery life:Meauring for 1,000 times
Fuse F: 100 mA
Auto power-off: This instrument will shut down 5 minutes after the last instruction sent from PC or function selection.
 
Display
Features: 102mm * 86mm standard LCD display
Storage capacity: 999 measured values at maximum
Connecting port: USB data cable for connecting to PC (data segregation has been preset)
 
Standard Accessories
4 pcs earth rods; 4 pcs crocodile clamps and wires
Black: 6mm; Red: 15mm; Blue: 30mm; Green: 6mm
User manual
Canvas bag
 
Optional Accessories
PC software and USB data cable
 

Product Enquiry
Address: Room 606, 2nd building, Animation Park, No.5 Yuehai Rd, Nanshan District, Shenzhen GuangDong China. 
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