Alternating voltage standard source

The invention discloses an alternating voltage standard source, and relates to the technical field of accurate instrument measurement and calibration. The alternating voltage standard source solves the problems of an existing linear structure alternating voltage standard source that calibration accuracy is low and stability is low, and the resolution ratio is low and continuous regulation cannot be achieved due to the resistance voltage sharing mode. According to the alternating voltage standard source, the PWM-DAC technology is adopted to adjust the amplitude of reference voltage, continuously adjustable volt ref is generated to control the amplitude of output alternating voltage of DDS. Circuit output is amplified, the output is passed through a signal conditioning circuit, integral control is adopted to adjust the output, and a closed-loop system is formed. Output stability is improved. 交流电压标准源，涉及精密仪器测量与校准技术领域。本发明是为了解决现有直线式结构的交流电压标准源校准精度低、稳定性差；电阻分压方式导致分辨率低、且不能连续调节的问题。本发明所述的本发明所述的交流电压标准源，利用PWM-DAC技术对基准电压进行调