Astatic voltmeter `` AMV ''.
Instruments for adjusting and controlling the PTA.The astatic voltmeter "AMV" has been produced presumably since 1950. Designed for laboratory measurements of voltage in AC circuits and for testing similar devices of lower classes. Accuracy class 0.5. Measurement range 0 ... 600 V. Measurement limits 0-75, 0-150, 0-300 and 0-600 V. AMV voltmeters are devices in which the measuring mechanism is assembled according to an astatic scheme that reduces the influence of external magnetic fields to acceptable limits ... On the common axis of the AMV device there are two identical movable parts fastened together. Acting on them, magnetic fields simultaneously cause rotational moments of mutually opposite directions, which balance the system.
