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The Clamp-on Ground Resistance Tester Model 3731 measures ground rod and small grid resistance through any season, without the use of auxiliary ground rods. Clamp-on Ground Resistance Testers are used in multi-grounded systems without disconnecting the ground under test. The Model 3731 simply clamps around the ground conductor or rod and measures the resistance to ground. By performing measurements on intact ground systems, the user also verifies the quality of the grounding connections and bonds. Resistance and continuity of grounding loops around pads and buildings may also be measured. The Model 3731 also provides alarm and memory functions. Specifications: Resistance Measurement Frequency : 2403Hz Current Measurement Frequency : 47 to 800Hz Current Overload : OL displayed above 29.99Arms Power Source : 9V Alkaline battery ( IEC 6LF22 or NEDA 1604A) Battery Life : Typical: 8 hours or approx. 1000 measurements of 30 seconds 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) U.S. Patent : No. 362, 639 UL File : No. E192383 Operating Temperature : 14° to 131° F ( -10° to 55° C) Operating Humidity : 10 to 90% RH @ 14° to 104° F ( -10° to 40° C) , 75% RH @ 131° F ( 55° C) Storage Temperature : -22° to 158° F ( -30° to 70° C) Safety Rating : EN 61010-2-032 ( Class 2) Double Insulation Double Insulation : Yes
