Using the ADuCM350 as the Measurement Hub and the AD8232 or AD8233 it is possible to do both Bio-Impedance Measurements and ECG Measurements with 1 solution.

**ECG**

- Attached document shows how to measure ECG using the ADuCM350.

**BIO-IMPEDANCE (See BC Calculations for Example)**

**4-Wire Absolute Impedance Measurement Concept is:**

- DFT measurement on Voltage measured by AD8226 (V
_{DFT}) - DFT measurement on Current measured by ADuCM350 (I
_{DFT}) - V
_{DFT}/ I_{DFT}= Z - This is all done automatically in 4-Wire Impedance example on SDK
- http://www.analog.com/media/en/technical-documentation/application-notes/AN-1302.pdf
- https://ez.analog.com/docs/DOC-11084

**2-Wire Relative Impedance Measurement Concept is:**

- ADuCM350 Only Measurement.
- DFT of RCAL = I
_{RCAL_DFT } - DFT of Z = I
_{Z_DFT} - Ratiometric Analysis gives Z.
- This is all done automatically in 2-Wire Impedance Example in SDK.
- Treat is as a standard 2-Wire Impedance Measurement with addition of 2 isolation resistors + 1 Rlimit.
- https://ez.analog.com/docs/DOC-12779
- http://www.analog.com/media/en/technical-documentation/application-notes/AN-1271.pdf

This document was generated from the following discussion: Bio-Impedance & ECG Measurement Solution