Hioki 3157-01AC Grounding HiTester Designed to measure whether the metal enclosure of electrical equipment is connected to the ground terminal at sufficiently low resistance levels. It also can be used to evaluate the grounding conditions of large-scale electrical installations. Measurement is carried out by using a high current according to the specifications of the measurement object, and determining the voltage drop at the measurement point. Reference values are as set out in the various safety standards. The 3157-01 can carry out measurements in accordance with the stipulations of multiple standards.  Specifications Measurement items Low resistance, AC 4-terminal method Generator section Current generator principle:PWM constant current control Current setting range: 3.0 A to 31.0 A (0.1 A resolution), into 0.1 Ohm load Maximum output power: 130 VA*1 (at output terminals) *1 Subject to derating according to ambient temperature (80 % at 40 �‹C) Frequency: 50 Hz or 60 Hz sine wave Soft start function: Apply current only after checking load connection Monitor section Resistance measurement:0 to 1.800 Ohm (0.001 Ohm resolution) Accuracy: ±2 % rdg. ±4 dgt. (after zero-adjust) Current monitoring range: 0 to 35.0 A AC (0.1 A resolution) Monitoring cycle: 2 times/second Other functions Timer setting:Counts down time after start until preset time, or shows elapsed time after start Setting range: 0.5 to 999 second Comparator: Pass/Fail evaluation using preset upper/lower limit, I/O output Memory function: max. 20 settings (with save/load) Display Fluorescent tube digital display Power supply 100 to 120 V, 200 to 240 V AC (auto-switching), 50/60 Hz Dimensions, mass 320 mm(12.60 in)W × 90 mm(3.54 in)H × 263 mm(10.35 in)D, 7 kg (246.9 oz)