Abstract: In the detector, a AC/DC amplitude balance circuit is designed. Through the circuit, both AC and DC amplitude can be got respectively and with-out changing the switch positions. The frequence range of the detector is also extended by the design. A all wave linear rectifier circuit riases the resolution to 1 μA. The two terminals of the detector can be used altena-tively without difference of polarity. This character further enhances the reliablity of the detector.

Key words: leakage current, amplitude balance, detector, all wave linear rectifier