White Matter NanoZ Manuel d'utilisateur télécharger pdf (Page 17)

(electrode positive) in ~100nA steps by moving the position of the slider with the

mouse or arrow keys. The voltage across the electrode site will be displayed on

the DMM. The DMM has limited measurement resolution (39mV) and should be

considered approximate, however the calibrated current reading adjacent to the

slider is accurate to within a few nA. The DMM also indicates if the voltage is out

of compliance, that is, if the voltage needed to achieve the desired current is

greater than the nanoZ can generate. To stop applying the current, select Off.

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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.

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

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White Matter NanoZ Manuel d'utilisateur Page 17