Ammeter-voltmeter circuit

An electromagnetic mechanism (EMM) is any device whose operation is based on the interaction of a ferromagnetic moving element with a magnetic field created by a moving winding. An EMM consists of two main units: an electromagnet and an actuator (the actuator of the load mechanism). The electromagnetic measuring device is essentially a converter of electromagnet energy into mechanical energy of the actuator. Electromagnetic system devices are used for measurements in AC and DC circuits mainly as panel ammeters and AC voltmeters due to their high performance characteristics: simple design and low cost, reliability in operation due to the simplicity and durability of parts and units of the measuring mechanism, high thermal stability to long-term overload, a wide range of measurement limits. High-precision electromagnetic devices (classes 05; 02 and 01) have been created for precise measurements of current and voltage, which are practically not inferior to electrodynamic system devices in terms of their main technical characteristics (accuracy, suitability for use on DC and AC, frequency range of consumed power). Currently, a large number of different types of electromagnetic devices are used, which differ in their purpose, design, shape of coils and cores, etc.