Electronic device including detachable measurement module and attachment pad

An electronic device comprising:

• a housing;
• a plurality of electrodes disposed on one face of the housing;
• and
• at least one processor;
• and
• memory storing programming instructions executable by the at least one processor to cause the electronic device to:
• in response to receiving a request for an electrocardiogram measurement:
• detect a first signal using a first electrode and a fourth electrode from among the plurality of electrodes,
• detect a second signal using a second electrode and the fourth electrode,
• detect a third signal using a third electrode and the fourth electrode, and
• storing in the memory the first signal and the second signal as a first biological signal, the second signal and the third signal as a second biological signal and the third signal and the first signal as a third biological signal in association with the requested electrocardiogram measurement.