Rad-97 Service Manual Chapter 4: Electrical Safety Testing
Masimo Corporation 50 www.masimo.com
Ground Continuity Test (Class I devices only)
Ground continuity should be detected from the potential equalization post of the device to the earth pin of the mains plug of the connected Masimo power supply cord or
directly to the Earth pin of the appliance inlet of the DUT.
Refer to schematic below for this test setup:
The following steps should be followed to conduct the ground continuity test:
1. Connect Masimo power supply cord to appliance inlet on the DUT.
2. Connect Digital Multimeter (DMM) between the accessible earthed metal part and the earth pin of the Masimo power supply cord.
3. Check for continuity using the continuity test feature of the DMM.
4. Move the connected Masimo power cord around and confirm that there is no intermittent continuity.
Measuring Earth Leakage Current (Class I devices only)
Earth leakage current is the current that flows from the Mains Part through or across the insulation into the protective earth conductor.
The earth leakage current is measured in both “Normal” condition (NC) and as well as “Single Fault Condition” (SFC).
Refer to the schematic below for the general test setup:
For more specific test setup, follow the setup instructions as part of your Electrical Safety Tester.
The following test conditions should be considered for Earth Leakage Current testing:
Measuring Point A Measuring Point B Input Voltage Frequency Device State Polarity Neutral Test Condition Leakage Current Limit
1
Protective Earth DUT Earth 120 Vac or 240 Vac 50 or 60 Hz ON Normal Closed NC 5 mA
Protective Earth DUT Earth 120 Vac or 240 Vac 50 or 60 Hz ON Reverse Closed NC 5 mA
Protective Earth DUT Earth 120 Vac or 240 Vac 50 or 60 Hz OFF Normal Closed NC 5 mA
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