Maintenance
91369 Service Manual 4-2
Mechanical Inspection
Verify that:
• The monitor and all optional equipment are clean.
• All screws are tight.
• The case and connector pins are not damaged.
• There are no frayed or pinched wires or cables.
Electrical Safety Testing
Safety testing protects the patient from electrical shock, especially micro-shock. It has been determined
experimentally that current values in the microampere (μA) range may cause fatal arrhythmias in electrically
susceptible patients. A patient is deemed electrically susceptible when connected to monitoring equipment.
Definitions
Classification — IEC/EN/UL 60601-1 Safety standard designation for the class of equipment and type of
patient applied parts that indicate the degree of protection provided against electrical shock.
Leakage Current — Current that is not functional. It includes patient leakage, ground leakage, and enclosure
(or chassis) leakage.
Patient Lead Leakage — Current that flows from the applied part of the patient lead to ground.
Chassis Leakage — Current flowing from the enclosure (or from conductive parts accessible to the operator)
through the ground conductor.
Normal Condition — Condition in which all means provided for protection are intact. Includes, ground
connections, insulation, creepage and clearance distances.
Single Fault Condition — Open ground, open neutral, line voltage on a patient connection, or any single state
other than normal condition that could compromise patient safety.
UUT — Unit Under Test.
Spacelabs Healthcare does not endorse standards to the exclusion of others. Therefore: BE SURE TO
CHECK YOUR LOCAL REQUIREMENTS TO ENSURE YOUR EQUIPMENT SAFETY TESTS COMPLY
WITH LOCAL STANDARDS. Generally accepted standards for medical monitoring equipment, such as the
Underwriters Laboratory (UL) and the National Fire Protection Association (NFPA) standards, are summarized
in Table 1.
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