Shanti electric instruments, a mumbai-based company, manufactures universal portable test instrument, which is a low voltage insulation tester suitable for serving and maintenance of electrical equipment, distribution networks and communication cables. The metal body of the instrument has collapsible handle and 65 mm logarithmic scale conforming to is 2992-1993. The rugged design of the product helps it to withstand industrial environment. The in-built hand-driven brushes ac generator and a static rectifier of the device supply stabilised dc voltage for accurate measurements. Cross coil movement, sintered anti-friction bearings and delrin moulded gears ensure trouble-free operation. The range of rated voltage is 100-1,000 v and the rated resistance ranges from 20 to 2,000 m ohm. Guard terminal of this instrument eliminates surface leakage current.
