Service manual
Maintenance
4-3
Preventive Maintenance (PM) Procedures
The following information describes the requirements and tests necessary for safety and
performance verification of Spacelabs Medical 90385 and 90387 systems. This procedure must be
performed yearly, and also following any product disassembly/assembly. This procedure must be
performed by trained personnel only.
Test Equipment Required
Electrical Safety Analyzer — Dynatech Nevada 232D or Equivalent
Patient Simulator — Dynatech Nevada 215A or Equivalent
Mechanical Safety Check
Verify that the unit is clean, the screws are tight, the connector pins are not damaged, the case is not
damaged, and that there are no frayed or pinched wires or cables. If the unit is mounted, check that
the mounting hardware is tight.
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.
!
• Cleaning, preventive maintenance, and safety checks should be performed
annually.
!
• Before testing, ensure that module housing(s) and one DC power supply have
their associated cables attached.
• Only use one power supply while performing safety tests.
• Ensure that the Ethernet cable and the AC power sources are removed.
• The AC line is auto detected; no user selection is necessary.
• Ensure that the leakage test equipment is calibrated.