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The “REF” socket: BNC type coaxial socket to be connected to the referenceelectrode of the electrochemical cell. This socket has an input impedance of10 12 Ohm and an input capacitance of less than 50 pF.. central contact: reference electrode. shielding: groundedThe “AUX” socket: PL259 type coaxial socket to be connected to the auxiliaryelectrode of the electrochemical cell.. central contact: auxiliary electrode. shielding: connected to the analog electrical zeroThe “CELL” push button (7)When lit, the “CELL” button indicates that the auxiliary and reference electrodesare connected to the PGZ or PST potentiostat. When the “CELL” button lamp is off,the PGZ or PST potentiostat power outputs (working, auxiliary and reference) aredisconnected so that electrode cable connection/disconnection can be performedsafely.Warning!Before connecting or disconnecting an electrode cable, it is necessary to cut off theelectrode circuit before (never connect or disconnect an electrode cable when the“CELL” lamp is lit).Analog inputs (“E(X) IN” and “I(Y) IN”) (8) - PGZ402 onlyE(X) INBNC coaxial socket. A voltage signal (± 15 V, AC or DC) can be input at this socketand analyzed by the PGZ402. Input impedance: 10 Kohm.I(Y) INBNC coaxial socket. A voltage signal (± 1 V full scale current range, AC or DC) canbe input at this socket and analyzed by the PGZ402. Input impedance: 10 KohmAnalog output (“Vg OUT”) (9) - PGZ402 onlyBNC coaxial socket. The central contact of this socket outputs the Vg appliedpotential (WORK – REF). Range: ±15 V. This socket has a very low outputimpedance.VoltaLab 21/06/10/40/50/80 117Section 5, Chapter 1: The PGZ and PST series