Multichannel Systems nanoZ manual - Manual (Page 19)

15
Impedance
test
mode
This mode rapidly cycles through all (or a subset) of the channels on the selected
probe, measuring the impedance of each electrode. The impedance results are
tabulated in the Report window (View | Report).
(A) Set the impedance Test frequency to the desired value. The actual test
frequency that will be used is shown in the status bar.
(B) Choose the number of Test cycles. The default setting of 40 cycles is a good
trade-off between accuracy and speed. Increasing the number of cycles will
marginally improve the accuracy due to averaging, at the expense of a longer
testing duration, whereas decreasing the number of cycles may lower accuracy
due to insufficient localization of the test signal in the frequency domain. The
testing time per site is displayed in the status bar.
(C) The Pause setting specifies a delay, in millisconds, after switching channels
before impedance testing is begun on the currently selected electrode. In most
cases this delay can be set to zero, however with some high capacitance
electrodes the test signal may take some time to settle to baseline after switching
channels. Increase the pause setting if the ʻtest signal clippedʼ warning is
reported or some channels are not measured (i.e. skipped measurements are
blank and highlighted in yellow in the Report window).
(D) Click the Test probe button to begin the test.
Clicking on Test probe again or pressing ESC at any time will pause the test,
and you will be given the option of continuing the test or stopping.
Impedance test results in the Probe report can be saved by clicking the icon or
selecting File | Save report from the main menu.
A
B
C
D