Electrical safety testing
Welch Allyn recommends performing ground continuity and leakage current tests after
all open-case repairs and dielectric strength testing
1
when replacing the power supply or
primary wiring according to 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 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 Leakage current shall be less than 500 µA from EP stud* to mains (Line and
Neutral pins of the IEC power connector).
Insulation resistance Insulation resistance measurements shall be performed with 500V DC from EP
stud to mains (Line and Neutral pins of the IEC power connector).
* To locate the equipotential terminal, see “Controls, indicators, and connectors.”
1
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.
58 Service CP 150 12-lead resting electrocardiograph
To Next Page
Loading...
