CP 150 12-lead resting electrocardiograph Service manual

Electrical safety testing

Welch Allyn recommends performing ground continuity, leakage current, and dielectric strength tests

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when replacing the power supply or primary wiring according to EN/IEC

60601-1 - Medical Electrical Equipment – Part 1: General Requirements for Basic Safety and Essential Performance or EN/IEC 62353 - Medical Electrical Equipment - Recurrent

Test and Test After Repair of Medical Electrical Equipment.

Due to the variability of test equipment in the field, Welch Allyn does not include specific instructions to perform electrical safety tests. When performing electrical safety tests, refer to your test equipment manuals for detailed instruction. The following table provides connections and test limits to assist you in performing these tests.

Test Limits

Ground continuity

Leakage current

Ground continuity from EP stud* (equipotential terminal) to the Gnd pin of the

IEC power connector shall be no greater than 0.1 ohms.

Leakage current shall be less than 300 µA from EP stud* to mains (Line and

Neutral pins of the IEC power connector).

Dielectric strength Dielectric strength shall be 1.8 kVAC EP stud* to IEC mains (Line and Neutral pins of the IEC power connector).

* To locate the equipotential terminal, see “Controls, indicators, and connectors.”

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Perform this test only if there is a reason to doubt the integrity of the electrical insulation (e.g. multiple trips of a residual-current device or liquid ingress of a saline solution). If you determine this test should be performed, return the device to Welch Allyn for service.

70 Electrical safety testing CP 150 12-lead resting electrocardiograph