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

GRT300 : 4-Wire Earth Ground Resistance Tester ยี่ห้อ Extech, USA

Measures earth ground resistance in 4 ranges from 2 to 2000 Ohm

The GRT300 measures earth ground in 4 ranges from 2 to 2000 Ohm. 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, Automatic Zero adjustment, Data Hold and Auto Power off. AC Earth Voltage. 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.

เครื่องวัดความต้านทานดิน EXTECH GRT300

Features:

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, Automatic Zero adjustment, Data Hold and Auto Power off
AC Earth Voltage
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:

Earth Ground Resistance ranges	2Ω/20Ω/ 200Ω/2000Ω
Basic Accuracy	±(2%rdg+3d)
Resolution	0.01Ω/ 0.1Ω/1Ω/0.01kΩ
Test Current / Frequency	<2mA / 820Hz
AC Earth Voltage / Frequency	0 to 300VAC / 40 to 500Hz
Accuracy	±(2%rdg+3d)
Power supply	Eight 1.5V ‘AA’ Batteries
Dimensions	9.8 x 7.8 x 4.3″ (250 x 190 x 110mm)
Weight	3.15lbs (1430g) (batteries included)