CHI200(B) Picoamp Booster and Faraday Cage With CHI200(B) Picoamp Booster and Faraday Cage, the current down to a few picoamperes can be readily measured. CHI200 is compatible with Model 600/A, 700/A series of instruments. CHI200B is compatible with Model 600B and 700B series. When used with 700/A/B series bipotentiostat, Picoamp Booster will have effect on the primary channel only. The internal sensitivity of the 600B series is the same as the Picoamp Booster (1¡¿ 10-12 A/V). However, the bias current of the 600B series input can be as high as 50 pA. The Picoamp Booster has lower bias current, and it also bring the preamplifier close to the electrode that results in lower noise. It is also necessary to have Faraday Cage in case of small current yet relatively fast measurements. When the Picoamp Booster is connected and the sensitivity scale is at or below 1e-8 A/V, the Picoamp Booster will be enabled. Otherwise, it will be disabled. The instruments automatically sense whether a Picoamp Booster is connected. The enable/disable switching are also automatic. The Picoamp Booster will be disabled techniques using automatic sensitivity switching, such as Tafel plots, bulk electrolysis (BE), and ac impedance (IMP). It is not necessary to disconnect the Picoamp Booster to run those techniques. However, galvanostatic techniques, such as chronopotentiometry (CP) and potentiometric stripping analysis (PSA), the Picoamp Booster has to be disconnected. Besides weak signal measurements, the Faraday cage is useful eliminating the electrical interference, especially line frequency noise. In case the electrochemical cell picks up electrical noise from the environment, the use of Faraday cage is strongly recommended.