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6.12 Measuring an A/D IN signalUsing your VoltaLab system, you can measure an A/D IN signal in addition parallelwith potentials and currents. An A/D IN signal is a voltage signal (-5000 mV to+5000 mV) coming from any meter (e.g.: a millivoltmeter) connected to the “A/D IN”socket of the PGZ or PST050 potentiostat.The resolution of the A/D IN measurement is 150 µV.An A/D IN measurement is performed simultaneously with the E measured potentialand I measured current of the method in progress.An A/D IN can be measured in addition to any VoltaMaster 4 methods except Pot.Dynamic EIS (Impedance), Pot. or Gal. Tutorial EIS (Impedance), Pot. Fixed Freq.EIS (Capacitance), Pot. Tutorial CV method, Pot. or Gal. Low Current CV.To define an A/D IN signal:. select “Settings” then “A/D IN configuration”.. In the “Label” box, type a name to identify the A/D IN signal (example: extsignal). 10 characters are allowed.. In the “Coefficient”, “Formula” and “Constant” boxes, enter an equation that willconvert the x difference in potential measured (in V) at the “A/D IN” socket ofthe potentiostat into the y magnitude you want to display with the unit specifiedbelow.Available formulas: y = a x + b ; y = a x² + b ; y = (a / x) + b ; y = a log IxI + bwhere a and b are the Coefficient and the Constant (scientific formataccepted).Example: you want to display the measurement signal in pH units. Themeasurements were performed with an electrode having a response slope of59 mV / pH unit at 25°C and a pH at 0 mV of 6.65. The pH measurements aresupposed to be performed at 25°C, the influence of the temperature on the pHmeasurement can be bypassed by the way.The formula to be entered is: y = - 0.0169 (= 1/59) x + 6.65.. In the “Unit” box, type the unit label that will be assigned to the ordinate axis ofthe A/D IN signal curve (example: pH). 10 characters are allowed.198VoltaLab 21/06/10/40/50/80Section 6, Chapter 12: Measuring an A/D IN signal