SIGNAL GENERATOR FOR GENERATING SINUSOIDAL OUTPUT SIGNALS AT PREDETERMINED PHASE POSITION

摘要

The signal generator generates sinusoidal output signals (UR, US, UT, IR, IS, IT) and is advantageously used as three-phase generator for calibrating electricity meters. A number generator (10 to 16) controlled by a clock generator (37) cyclically generates for each output signal (UR, US, UT, IR, IS, IT) binary coded phase step signals (Ph) which are transformed into binary coded instantaneous-value signals by a function generator (17) and into an analog signal by one or more digital/analog converters (18). Each output signal (UR, US, UT, IR, IS, IT) is associated with a sample/hold circuit (19 to 24) which are cyclically clocked by a clock distributor (38). The number generator is formed by angle input elements (10, 11), a switch (12), an adding element (14) and an accumulator (16). A reference voltage input (39) of the digital/analog converter (18) can be connected to at least two adjustable reference voltage sources via a controlled multiple changeover switch. An rms-value measuring instrument connected to amplifiers (31 to 36) controls the reference voltage sources and a phase angle measuring instrument controls the angle input element (10). IMAGE