I am interested in ADAS1000. Can it measure the and the imaginary part of the impedance? Thanks a lot.
Are you referring to the respiration measurement?
The respiration measurement is performed by driving a high frequency (programmable from 46.5 kHz to 64 kHz) differential current into two electrodes; the resulting impedance variation caused by breathing causes the differential voltage to vary at the respiration rate. The signal is ac-coupled onto the patient. The acquired signal is AM, with a carrier at the driving frequency and a shallow modulation envelope at the respiration frequency. The modulation depth is greatly reduced by the resistance of the customer-supplied RFI and ESIS protection filters, in addition to the impedance of the cable and the electrode to skin interface (see Table 12). The goal is to measure small ohm variation to sub ohm resolution in the presence of large series resistance.
The magnitude and the phase of the resultant waveform is what is returned back by the ADAS1000.
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