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Voltage measurements recorded from multiple channels by carrying out preliminary electrical tests on the instrumentation. Acquisitions were performed for one second with a sample rate of 5000 Hz: (a) Sinusoidal waveform input of 20 V peak-to-peak, duty cycle of 50%, and frequency of 1 Hz; (b) sinusoidal waveform input of 20 V peak-to-peak, duty cycle of 50%, and frequency of 10 Hz.
