主题：使用parstat 2273中的一点问题

我用 princeton的parstat2273测一个陶瓷样品的阻抗谱，前两天测试没有什么问题，现在无法测了，出现以下提示potential overload:check reference electrode。软件的设定参数如下
Cell Definition:

    Potentiostat: PARstat 2273 Revision 2273

    Analyzer:

    Calibration Dataset: 2273 Z Calibration from Calibrations.mdb

    Working Electrode: Solid Electrode

    Working Electrode Area: 1.000 cm?
    Reference Electrode: (unspecified) (0.000 V)



Scan Definition:

    Start Frequency: 1.00 MHz

    End Frequency: 100. mHz

    Number of Points: 30

    Point Spacing: Logarithmic

    AC Level: 10.0 mV rms

    DC Potential: 0.0000 V vs open circuit

    Data Quality: 1

    Measurement Delay: disabled



PreScan Definition:

    Pulsing Conditioning disabled

    Initial Open Circuit Delay: disabled

    Open circuit: 0.003 V (Measured)

    Equilibration Time: disabled



Options:

    Current Ranging: Fully Automatic

    Rise Time: Automatic - Single Ended Electrometer

    Ignore external WAIT line in: YES

    Issue trigger out before starting experiment: NO

    External input enabled: NO

    Reset potentiostat before starting experiment: YES

    Turn cell off when done: YES
哪位用过这个仪器的，给指点一下是怎么回事？