Apparatus for recording physiological signals, in particular of the Holter type, with cable continuity testing

摘要

The recorder (10) has an input signal terminal (12) which is measured by an operational amplifier (16) referred to earth or another circuit and connected to a microprocessor (20). A microcurrent signal generator uses a switch (36) and resistance (32) to impress positive and negative microcurrent impulses on the input cable and the voltage response is measured by the operational amplifier giving indication of abnormality An Independent claim is also included for: Equipment able to generate positive and negative microcurrent impulses and determine the input cable impedance from the voltage response