White Matter NanoZ Manual de usuario descargar pdf (Pagina 21)

impedance spectroscopy results in the Probe report can be saved by clicking the

icon or selecting File | Save report from the main menu.

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This mode can be used to increase the charge capacity of all (or a subset of)

electrodes on the selected probe. Activation mode applies a bipolar, variable duty

cycle, constant current square-wave to the electrode, which both lowers the

impedance and increases the charge capacity, two properties that are desirable

for effective electrical stimulation.

With suitable electrodes and appropriate waveform settings, the activation mode

can also be used for in vivo or in vitro microstimulation.

(A) Only the Fixed activation time is implemented in the current software

version, so this setting is currently ignored.

(B) Set the Activating current. Both current settings can be adjusted from -12uA

(electrode negative) to +12uA (electrode positive) in ~100nA steps, by moving

the position of the sliders. The exact currents that will be applied to the electrode

are indicated above the sliders. The DMM has limited measurement resolution

(39mV) and should be considered approximate, however the calibrated current

readings adjacent to the sliders are accurate to within a few nA.

Duration per electrode. The Duty cycle determines the relative time of the two

current phases, where the percentage refers to the first current setting in (B). If

Test Z is checked, the electrode impedances will be measured before and after

electrode activation at the specified test frequency. The Pause setting specifies a

delay between the activating cycle and testing the post-activation impedance. It

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White Matter NanoZ Manual de usuario Pagina 21