The two-photon （852 nm and 509 nm） excitation was used to achieve the preparation of the 53S_1/2 Rydberg state of cesium atoms. The electromagnetically induced transparency spectrum of Rydberg atoms in which the radio frequency electric fields in the AC Stark effect was studied. By changing the amplitude of the radio frequency electric fields， the dependance of the Stark frequency shift of Rydberg atoms on the amplitude of the electric field was investigated. In the experiments， the power frequency electric fields were modulated to the radio frequency electric fields. The traceable measurement of the field strength of the power frequency electric field was realized. The field strength sensitivity can reach 0.37 V/cm， and the amplitude measurement dynamic range can reaches 37.2 dB. Moreover， the frequency measurement of power frequency electric fields is demonstrated， and the uncertainty of frequency measurement is smaller than 0.1%.