Extech GRT350 Specifications

GRT350 4-Wire Earth Ground

Resistance/Resistivity Tester

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 (r) test

• 4-wire, 3-wire, and 2-wire testing

• Large dual line LCD

• Autoranging

• Automatic I (current) spike check

• Automatic P (potential) spike check

• Test Hold function for easy operation

• AC Earth Voltage

• Data Hold and Auto Power Off

• Overrange and low battery indication

• Store/recall up to 200 test results

• Complete with built-in hard carrying case, test leads

with alligator clips, 4 auxiliary earth bars, and eight

1.5V AA batteries

Speciﬁcations

Earth Ground Resistance 20Ω/200Ω/2000Ω

Accuracy ±(2%rdg+3d)

Resolution 0.01Ω/ 0.1Ω/1Ω

Test Current / Frequency approx. 2mA/820Hz

Earth Resistivity (r) 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

Ordering

PRODUCT DATASHEET

GRT350* N ................4-Wire Earth Ground Resistance/Resistivity Tester

382153.........................Replacement Earth Bars (2pk)

382154.........................Replacement Set of Leads

N Indicates products that are available with optional calibration traceable to NIST. Order with -NISTL after part number.

*Limited NIST for Certiﬁcate of Traceability to 4-wire mode only

UPC Code: 793950383155

www.extech.com