Spacelabs 91369 - Equipment Required; Ground Resistance

91369 Service Manual 4-3
Maintenance
Equipment Required
Electrical Safety Analyzer, Fluke model 232D or equivalent.
These tests should be performed according to the hospital’s scheduling requirements, at least annually or after
repair or modification.
Warning:
Before starting 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.
Note:
All tests must be performed according to the safety analyzer’s operations manual, and any local
requirements.
Ground Resistance
1 Attach the power cord to the monitor under test, then 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.
2 Verify that the resistance is less than 500 milliohms (0.5 ohms).
Chassis Leakage Current Tests
1 Plug the leakage analyzers into mains power.
2 Plug the equipment into the analyzer’s AC receptacle.
3 Verify that the leakage current from the chassis to ground is less than the values in Table 2.
Table 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