Protective Ground Tester Indispensable for Standards Certification
The Hioki 3157 is an AC ground bond tester designed for protection circuit testing of a wide range of electrical equipment, including industrial machinery, medical equipment, and measuring instruments using a constant current system, enabling it to provide stable output current.

Key Features
• Easily perform protective continuity testing in compliance with international safety standards and laws
-1) Protective continuity resistance measurement for medical devices and general electrical devices
-2) Ground connectivity testing when installing electrical machine tools and distribution panels
-3) Testing of protective grounding and isopotential grounding work for medical equipment
-4) Evaluation of contact status using large currents
• Feedback control system that is capable of applying a stable current even with a fluctuating load
• Soft-start function that checks the connection to the device under test before applying the current

Model No. (Order Code)

3157-01100-120 / 200-240 VAC switching

Note: This instrument is not capable of performing measurement by itself. Please purchase two Current probe 9296 units or one Current probe 9296 and one Current apply probe 9297, depending on your measurement application. 


Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Basic functionsAC 4-terminal method resistance measurement
DisplayFluorescent tube (digital display)
Current setting range3.0 A to 31.0 A AC (0.1 A resolution), into 0.1Ω load
Max. output power130 VA (at output terminals)
Open-terminal voltageMax. 6 V AC
Generator frequency50 Hz or 60 Hz sine wave (selectable)
Resistance measurement /span>0 to 1.800 Ω (0.001 Ω resolution), Accuracy: ±2% rdg. ±4 dgt. after zero-adjust
Voltage measurement0 to 6.00 V AC (single range 0.01 V resolution), Accuracy: (1 % rdg. +5 dgt.)
Monitor section0 to 35.0 A AC/ 0 to 6 V AC, Refresh rate: 2 times/s
Timer displayCounts down time after start until preset time, Shows elapsed time after start
Timer setting0.5 s to 999 s
ComparatorPASS/FAIL evaluation using preset upper/lower limit, buzzer sound, signal output
Memory functionMax. 20 settings (with save/load)
InterfacesEXT I/O, EXT SW, GP-IB or RS-232C (option)
Power supply100 to 120 V/200 to 240 V AC (switching, 50/60 Hz)
Dimensions and mass320 mm (12.60 in)W × 90 mm (3.54 in)H × 263 mm (10.35 in)D, 7 kg (246.9 oz)
AccessoriesPower cord ×1, Instruction Manual ×1, Spare fuse (inlet) ×1, Shorting bar ×2
Catalog: AC GROUNDING HiTESTER 3157Download PDF  [1MB]English

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