AMMETERS
v Ammeter (see amp +. . . meter from μετρέω - measured) - a device for measuring current in amperes. Ammeter scale is calibrated in microamperes, milliamperes or amperes k. A in accordance with the limits of the measurement device. In the circuit amperemeter in series with the circuit section, current which is measured, to increase the limit of measurement - the shunt or transformer.
FUNCTION v The principle of operation of the magnetoelectric device is based on the creation of the torque due to the interaction between the field of the permanent magnet and the current which passes through the coil frame. With a frame connected to the arrow, which moves along the scale. Arrows is proportional to the rotation angle of the current.
CIRCUIT OF THE AMMETER
v Ammeters are magnetoelectric, electromagnetic, electrodynamic, thermal, induction, detection, thermoelectric and photovoltaic.
v Moving coil ammeter are designed to measure the current in the DC and AC.
v Electromagnetic current meter is used to measure DC current.
v Electrodynamic current meters are used to measure the current in the DC and AC currents of industrial and high (200 Hz) frequencies
v Thermal ammeter shows the actual current value
v Ferrodinamicheskie ammeters used primarily as automatic recording devices for alternating current circuits.
v Rectifier ammeter consists of a transmitter AC pulsed with silicon or germanium diodes and magnetoelectric indicator measuring its DC component.
v Induction ammeters measure the effect of alternating current.
DIGITAL AMMETER