เครื่องวัดความต้านทานดิน 4-Wire Earth Ground Resistance/Resistivity Tester รุ่น GRT350

เครื่องวัดความต้านทานดิน (Earth Resistance and Resistivity Tester) 4-wire, 3-wire, and 2-wire testing 

EXTECH GRT350 : 4-Wire Earth Ground Resistance/Resistivity Tester ยี่ห้อ Extech, USA

Measures earth ground resistance from 2 to 2000 Ohm and resistivity from 0.06 to 628 kOhm-m

To ensure good ground system installation, use Extech’s GRT350 Tester to check the resistance of the ground as well as the soil resistivity before you install your ground rods. This tester includes all hardware necessary to measure Earth Ground Resistance in 3 ranges, from 20 to 2000Ω, and Resistivity from 0.06 to 628kΩm. Electricians and technicians should also check their ground system periodically for predictive maintenance ensuring the resistance level doesn’t exceed the allowed safety level.

Features:
 
  • Earth resistivity (p) test
  • 4-wire, 3-wire, and 2-wire testing
  • Large dual line LCD
  • Automatic I (current) and P (potential) spike check
  • Test Hold function for easy operation
  • Autoranging, Data Hold and Auto Power off
  • AC Earth Voltage
  • Store/recall up to 200 test results
  • Overrange and low battery indication
  • Complete with test leads with alligator clips, 4 auxiliary earth bars, hard carrying case, and eight 1.5V AA batteries
 
For complete specs please download the product datasheet (not available for some accessories)
 
Specifications:
UnitRange
 Earth Ground Resistance  20Ω/200Ω/2000Ω
 Accuracy  ±(2%rdg+3d)
 Resolution  0.01Ω/ 0.1Ω/1Ω
 Test Current / Frequency  approx. 2mA/820Hz
 Earth Resistivity (ρ)  0.06 to 6.28 kΩm, 0.62 to 62.8 kΩm, 6.28 to 628 kΩm
 AC Earth Voltage  0 to 300VAC
 Accuracy  ±(2%rdg+3d)
 Dimensions  9.8 x 7.8 x 4.3" (250 x 190 x 110mm)
 Weight  3.15lbs (1.43kg) - batteries included

 

Accessories:
  • Complete with built-in hard carrying case, test leads with alligator clips, 4 auxiliary earth bars, and eight 1.5V AA batteries

EXTECH GRT350: 4-Wire Earth Ground Resistance/Resistivity Tester

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