E ; C RH Type Superhigh Precision High Voltage Resistors. E ; C RH type superhigh precision high-voltage resistors are used in physical and chemical measuring instruments. The operating temperature on these precision resistors is -55°C TO + 150°C. They are small lightweight and have high reliability, small temperature coefficient. The resistors offer minimised resistance change in long-term stability and load life and are protected from changes in pulse voltage. Applications. Industrial equipment X - ray apparatus Electron microscopes