Duncan Instruments Canada Ltd
Duncan Instruments Canada Ltd.
Electronic Measurement Solutions since 1968
ISO 9001
 
1-877-742-4448
Products

 

Clamp-On Ground Resistance Tester Model 3731

Ground Resistance Tester

Features

  • Simple and fast clamp-on operation - no leads, no auxiliary rods or spacing requirements. No need to disconnect neutral service
  • Direct reading of ground resistance from 0.01O to 1200O
  • Direct reading of continuity and ground loop resistance
  • Direct reading of ground leakage or phase current from 1mA to 30Arms
  • Jaw design with large 1.25" (32mm) window - accommodates up to 1000MCM cables
  • Auto-off for power management
  • Alarm function with adjustable set point and buzzer for quick field checks
  • Memory function to store 99 field measurements for later retrieval
  • CE Mark and UL approved
  • Rugged Lexan head and body construction resists breakage
  • Alarm settings and stored memory information saved during shutdown
  • Patented design
Application
  • Measure electrical ground rod and grid resistance
  • Use on multi-grounded systems without disconnecting the ground rod under test
  • Measure resistance and continuity of grounding loops around pads and buildings
  • Measure leakage current flowing to ground or circulating in ground systems
  • Conduct field surveys and retrieve and analyze readings at a later time
  • Use on cell towers and telecommunication sites
  • Use on pools, spas and other consumer installations



Technical Specification

Ground Resistance Ranges

 

Auto-Ranging 0.01 to 1200 Ohm

Range (Ohm) Accuracy ( % of Reading) Resolution
0.1 ~ 1.00 ±(2% ± 0.02) 0.01
1.0 ~ 50.0 ±(1.5% + 0.1) 0.1
50.0 ~ 100.0 ±(2.0% + 0.3) 0.5
100 ~ 200 ±(3.0% + 1) 1
200 ~ 400 ±(6.0% + 5) 5
400 ~ 600 ±(10% + 10) 10
600 ~ 1200 ±(25% + 50) 50

Current Measurement Ranges

 

Auto-Ranging 1mA to 30.00 Arms

Measurement Range Accuracy ( % of Reading) Resolution
1 to 299mA ±(2.5% + 2mA) 1 mA
0.300 to 2.999A ±(2.5% + 2mA) 0.001 A
3.00 to 29.99A ±(2.5% + 20mA) 0.01 A
10A 2.5% + 0.03 A 0.01 A
20A 2.5% + 0.05 A 0.03 A
Resistance Measurement Frequency
2403Hz
Current Measurement Frequency
47 to 800Hz
Current Overload
OL Displayed above 29.99 Arms
Power Source
9V Alkaline Battery
Battery Life
Typical: 8 Hours or approx. 1000 measurements of 30 second
Weight
1050g
Dimensions
9.25 x 3.94 x 2.17 " (235 x 100 x 55mm)
Weight
2.2 lbs (1Kg)
Jaw Window Diameter
1.25" (32mm)
Jaw Opening
1.38" (35mm)
Display
LCD 33/4 Digit, 1.73 x 1.10" (44 x 28mm)
Operating Temperature
14° to 131°F ( -10°C to 55°C)
Operating Humidity
10 to 90% RH @ 14° to 104 °F(-10° to 40°C), 75RH @131°F (55°C)
Storage Temperarure
-22 to 158°F(-30°C to 70°C)
Safety Rating
EN61010-2-032 (Class 2) Double Insulation
CE Mark
Yes

Last modified August 10, 2009

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