Multichannel Systems MEA-IT Manual - Manual (Page 22)

Impedance Testing Device MEA-IT Manual
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Main Controls
The main control buttons allow to "Load" an old measurement and "Save" the current one
to the database. The "Measurement" and "Cancel" buttons start and interrupt the impedance
measurement. With the "Export" function, the results of a current or loaded measurement can
be exported in ASCII format. The layout of the ASCII file can be selected in the "Preferences"
dialog.
Log File
Next to the virtual MEA layout the log file window also displays the impedance measurement
values, as well as some additional parameters. There are six columns: ID = Hardware ID,
Electrode = electrode name, Impedance, Phase Shift, R = resistance, and C = capacitance.
You can click into the header of each column to sort the values of this column. If the arrow
points up, the column starts with the smallest values. You can click on the header again and
the arrow and the values will turn around and the column starts with the largest values.
The column "ID" displays the hardware ID of the MEA electrodes in the sequence of
measurement. The column "Electrode" displays the electrode name in the layout grid.
Depending on the MEA type, the name can consist of either only numbers or letters and numbers.
The "Impedance" is measured in units of kilo Ohm. It’s the same value that is displayed
in the virtual MEA Layout. The "Phase Shift" is measured in degrees. The values of phase
shift and impedance are used to calculate the values of the resistor and the capacitor. The "R"
Resistance values are shown in kilo Ohm. The "C" Capacitance values are shown in nano Farad.