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4-3
91390 QUBE
M AINTENANCE
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 MAKE SURE 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 4-1 on page
4-3.
Equipment Required
Electrical Safety Analyzer, Fluke model 232D, or equivalent.
Perform these tests according to the scheduling requirements for
the hospital, at least annually or after repair or modification.
Note:
Perform all tests according to the operations manual for the
safety analyzer and any local requirements.
Ground Resistance
1 Attach the power cord to the monitor under test.
2 Measure the resistance from the AC power cord third wire ground
to a chassis location, such as the equipotential post on the rear of
the monitor.
Table 4-1 Summary of Standards for Medical Monitoring Equipment
International Mains to
Chassis Leakage
U.S. (120 V) Mains to
Chassis Leakage
Mains Resistance
100 μA - normal condition, ground
attached (AC connector to chassis)
300 μA - normal condition, ground
attached (AC connector to chassis)
500 milliohms*
500 μA - single fault condition, open
ground, or reverse polarity
300 μA - single fault condition, open
ground, or reverse polarity
500 milliohms*
* Measured from the AC Power cord third wire ground to the most distant ground attachment
Warning:
Before you start safety tests, ensure that no patient is connected to the
device under test. If safety tests must be performed on equipment
currently monitoring a patient, obtain permission to disconnect the
cables from the monitor and patient.
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