Precision Low Frequency AC Voltage Source and Its Calibration Method

摘要

Because of special performance of Precision low frequency AC voltage source and measurement devices, the evaluation and calibration of them are limited in deficient (in general, the DMM AC voltage measurement can not be available when input AC frequency is lower than 10Hz). The paper presents a method for designing low frequency AC voltage source and a corresponding method for calibrating to low frequency AC voltage source. Based on the low frequency AC voltage source, a new sampling computing method was presented .By using a precision sampler and quantizer, the low frequency AC voltage calibration system was setup. By employing the DDS technique, the accuracy and stability of low frequency AC voltage source were enhanced greatly.