• Vaiseshika Electron Device

Decade Megohm Boxes

Vaiseshika offer a Decade Megohm Box, Type 8400-HV. This high stability box is the compact and rugged high value resistance calibration standard. It provides the values in the denomination of 0.1 Meg, 1.0 Meg, 10.0 Meg, 100 Meg, 1000 Meg, 10000 Meg, 1 Giga, 10 Giga, 100 Giga and 1000 Giga ohms. This means that this high resistance calibration standard provide resistance value from 0.1 Meg to 1000 Giga ohm with an accuracy of ± 2% up to 1000 Megohm and ±5% from 1000 Megohm to 1000 Giga ohm. The instrument has been specially designed to work at operating voltage of 5000 V DC. This instrument has been designed for the first time in India as an import substitute. It employs ceramic with epoxy resistance to provide very low temperature coefficient. The specially designed silver to silver plated and gold plated switches have been used. The specially designed switch provides the contact resistance of the order of 0.01 ohm. The appropriate technical measures have been taken to arrest the problem of corona discharge and subsequent shunting effects. The instrument has been calibrated with resistance standards. It is extremely useful for the calibration of insulation tester, meggers and is a very useful for the quality control laboratories, calibration laboratories and meter-manufacturing units, component manufacturing industries, cable industries, etc.