An stability measurement instrument with high precision and great measurement range quality

At present there is a big demand to the stability test instrument. In this article ,an instrument for measuring Allen devision is designed based on the DDS technology as well as a high precious frequency measurement method that measure the difference frequency's period of the under test frequency and the reference. The instrument's background stability surpasses 4.0×10−12/1s, 1.5×10−12/10s and its measurement range is form 1MHz to 30MHz at present. It mainly has high accuracy and great measurement range compared with the overseas main product.