Extech Instruments UM200, GRT300, GT350, 382357, 382252 Catalog Page

N Indicates products that are available with optional calibration traceable to NIST. See page 160 for a complete listing.
Ground Resistance/Resistivity Testers & Micro-Ohm MeterGround Resistance Testers
382357 Clamp-On Ground Resistance Tester
Enables non-contact measurements of ground conductors without need for auxiliary ground spikes
• Autoranging ground resistance and True RMS AC Leakage current measurements
• Programmable Hi/Lo alarm
• 0.9" (23mm) Jaw size for large ground rods
• Simplifies ground resistance measurements on multiple point ground systems
• Auto power off
• Verification resistors confirm accuracy
• Automatic Self Calibration when powered on
• 9999 Count LCD display with Data Hold
• Electrical Noise Detection feature prevents inaccurate readings
• CAT III-300V, CAT II-600V
• 1 year warranty
• Complete with 9V battery, Resistance check plate, and durable metal storage case
Verify resistance of cellular and communication tower ground grids
SPECIFICATIONS RANGE RESOLUTION BASIC ACCURACY
Ground Resistance 0.025 to 1500Ω 0.002Ω ±1.5% AC Leakage Current (Trms) 1mA 0.001mA ±2.5% AC Current (Trms) 0.3mA to 30.00A 0.01A ±2.0% Resistance Test Frequency 3.333kHz Operating Temperature 32 to 122°F (0 to 50°C) Dimensions/Weight 10.2x4.4x1.9" (258x110x47mm) / 1.5lbs (700g) (meter only)
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382357 N
Clamp-On Ground Resistance Tester $1359.00
GRT300/GT350 4-Wire Earth Ground Resistance/Resistivity Testers
Includes all hardware necessary to measure earth ground in 4 ranges
• 4-wire, 3-wire, and 2-wire testing
• Large dual line LCD
• Autoranging
• Automatic I (current) spike check and Automatic P (potential) spike check
• Test Hold function for easy operation
• AC Earth Voltage
• Data Hold and Auto Power Off features
• Over-range and low battery indication
Model GRT300 Additional Feature
• Earth Ground Resistance in 4 ranges
• Automatic Zero adjustment
Model GRT350 Additional Features
• Earth Ground Resistance in 3 ranges
• Earth resistivity (r) test
• Store/recall up to 200 test results
SPECIFICATIONS GRT300 GRT350
Earth Ground Resistance 2Ω/20Ω/200Ω/2000Ω 20Ω/200Ω/2000Ω Basic Accuracy ±(2%rdg+3d) ±(2%rdg+3d) Resolution 0.01Ω/0.1Ω/1Ω/0.01kΩ 0.01Ω/0.1Ω/1Ω Earth Resistivity (r) 0.06 to 6.28 kΩm, 0.62 to 62.8 kΩm, 6.28 to 628 kΩm Test Current / Frequency <2mA/820Hz <2mA/820Hz
Complete with color coded test leads and alligator clips, 4 auxiliary earth bars, hard carrying case, and eight 1.5V AA batteries; 1 year warranty
AC Earth Voltage / Frequency 0 to 300VAC/40 to 500Hz 0 to 300VAC/40 to 500Hz Dimensions/ Weight 9.8 x 7.8 x 4.3" (250 x 190 x 110mm)/ 3.15lbs (1.4kg) - batteries included
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GRT300 N
GRT350 N
4-Wire Earth Ground Resistance Tester Kit $799.00
4-Wire Earth Ground Resistance/Resistivity Tester Kit $999.00
382252 Earth Ground Resistance Tester Kit
Includes all hardware necessary to measure earth ground in 3 ranges from 20 to 2000Ω
• Large dual display with backlight and double molded housing
• Test Hold function
• Automatic Zero adjustment
• AC/DC Voltage, Resistance, and Continuity
• Auto Power off, Over-range and low battery indication
• 1 year warranty
• Complete with test leads, two auxiliary earth bars, carrying case, and six 1.5V AA batteries
SPECIFICATIONS RANGE RESOLUTION BASIC ACCURACY
Earth Ground Resistance ranges 20Ω/ 200Ω/2000Ω 0.01Ω/ 0.1Ω/1Ω ±(2%rdg) Test Current (Freq.) <2.5mA (820Hz) 0.001mA ±2.5% AC Earth Voltage (Freq.) 0 to 200VAC (50 to 400Hz) ±(3%rdg) DC Voltage 0 to 1000V 0.1V ±(0.8%rdg) Resistance 0 to 200kΩ ±(1%rdg) Continuity 40Ω Category rating CAT III-1000V Dimensions/ Weight 7.9x3.6x2" (200x92x50mm)/ 1.5lbs (700g) (meter only)
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382252 N 382253 Replacement Earth Bars (2pk) $41.99
382254 Replacement Set of Test Leads $21.99
Earth Ground Resistance Tester Kit $249.99
UM200 High Resolution Micro-Ohm Meter
Provides resolution down to 1µΩ using 4-wire Kelvin clip test leads
• 6 ranges with 3 sub-ranges in each current range
• Measurement of resistive and inductive materials
• Auto or Manual ranging
• High resolution to 1µΩ
• 5-Digit backlit LCD
• Built-in comparator for Hi/Lo/Go resistance testing with 20 sets of pre-stored values
• Store/Recall up to 3000 measurements
• 10A maximum test current
• Cable length measurement (feet or meters)
• RS-232 interface
• 1 year warranty
• Complete with 4-wire cables with Kelvin clip connectors, rechargeable Li-Polymer battery, AC adapter/charger, software and USB cable, and carrying case
SPECIFICATIONS RANGE RESOLUTION CURRENT BASIC ACCURACY
Resistance 60mΩ Ω 10A ±(0.25%)
Complete with 4-wire cables with Kelvin clip connectors, rechargeable Li-Polymer battery, AC adapter/charger, software and USB cable, and carrying case
Power Rechargeable Li-Polymer Battery Dimensions/Weight 10.1 x 6.1 x 2.2" (257 x 155 x 57mm)/ 2.6lb (1160g)
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UM200 N
600mΩ 10µΩ 1A ±(0.25%) 6Ω 100µΩ 100mA ±(0.25%) 60Ω 1mΩ 10mA ±(0.25%) 600Ω 10mΩ 1mA ±(0.25%) 6kΩ 100mΩ 100µA ±(0.75%)
High Resolution Micro-Ohm Meter $2099.00
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