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| == Troubleshooting ==
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| === '''Oxygen slope neg. fluctuating'''Â ===
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| ::::* '''Customer ID''': Anonymous
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| ::::'''Question:''' I am having some trouble getting the O<sub>2</sub> slope neg. to stabilize at zero pmol/(sâ˘mL) during air calibration. The signal will be stable at -4 pmol/(sâ˘mL), then fairly quickly climb to +4 pmol/(sâ˘mL) then swap back down to -4 pmol/(sâ˘mL) in a long wave that repeats periodically over time.
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| [[File:Before changing energy supply.png|600px|center]]
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| ::::'''Answer:''' We noticed that your peltier power follows the changes observed in the O<sub>2</sub> slope neg. To rule out electrical fluctuations we would ask you to exchange the energy supply of the O2k and run an air calibration file to check.
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| [[File:After changing energy supply.png|600px|center|After changing energy supply]]
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| :::: After changing the electrical supply the O2 slope neg. and the Peltier Power signal were stable.
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