UL 1437-2006《配电板式电子模拟设备》

These requirements cover electrical and electrically operated indicating and recording instruments of the analog type that are powered only from the measured parameter and are intended for ordinary use in panel boards and the like. These requirements cover direct-acting or indirect-acting instruments and accessories that may contain electronic devices. These requirements cover instruments constructed for special purposes such as, ultrasensitive d-c microammeters, high-resistance voltmeters, thermo-milliammeters, thermal voltmeters of the vacuum-couple type, and instruments with special and unusual ranges. These requirements also cover auxiliary equipment and accessories designed to be used with measuring instruments as indicated in 1.1. These requirements do not cover: Indicating instruments provided with arrangements for curve drawing, contact making, and the like that derive the power for the functioning of these arrangements from an external source other than the measured parameter.