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18. Eaux overloadThis error message indicates that the compliance voltage measured in absolutevalue at the auxiliary electrode is higher than 20 V for a PGP201, 30 V for a PGZ/PST or 100 V when the HVB100 is connected to the PGZ/PST.EffectsThe potentiostat could not perform the potential or the current regulation. Theelectrodes remain connected and the sequence in progress is stopped.Causes· There is a cut-off in the auxiliary electrode circuit: Raux is nearly infinite.If a PGZ or a PST is used without HVB100, check that the “CELL” lamp isoff before any operation (if not, press the “CELL” button), check the auxiliaryelectrode and its connecting cable, press the “CELL” button again then restartthe experiment with VoltaMaster 4.If the HVB100 is used, check the “CELL” lamp of the HVB100 is lit. If not,press the “CELL” button then start the experiment with VoltaMaster 4. If yes,turn off the two “CELL” lamps (HVB100 and PGZ/PST) and check the auxiliaryelectrode and its connecting cable, press the two “CELL” buttons again thenrestart the experiment with VoltaMaster 4.If a PGP201 is used, check the auxiliary electrode and its connecting cablethen restart the experiment with VoltaMaster 4.· In potentiostatic mode, and for a given current I, the resistance Raux[Relectrolyte (resistance of the electrolyte located between the auxiliary andthe reference electrodes) + Rp Aux (polarisation resistance of the auxiliaryelectrode)] is high enough to obtain an output voltage Eaux. = Raux x I higherthan 20 V (30 V or 100 V) in absolute value. The resistance Raux can bedecreased by placing the auxiliary electrode closer to the reference one and byincreasing the auxiliary electrode surface.· In potentiostatic mode, there is a cut-off in the reference electrode circuit:the potential Vg between the working and the reference electrodes couldnot be adjusted and increased leading to an increase in the current I andthe output voltage Eaux. which becomes higher than 20 V (30 V or 100 V) inabsolute value. Check the reference electrode (defective reference electrode,unsaturated or contaminated liquid junction, clogged junction, air bubbletrapped), and check the reference electrode connecting cable.. You have connected an additional unit (AMU130 for example) to the PGZ402and try to run a sequence with the PGZ402 “CELL” lamp lit: press the “CELL”button then click “OK” to continue with the next method of the sequence orclick “Cancel” to stop the sequence.VoltaMaster 4 - Version 7.0x 97Section 4, Chapter 9: Troubleshooting list