Table 3-2: Earth Leakage Current Limits - Nellcor NPB-190 Service Manual

Section 3: Performance Verification
3.4.1 Ground Integrity
3.4.2 Electrical Leakage
3.4.2.1 Earth Leakage Current
AC
POLARITY
Reversed
3.4.2.2 Enclosure Leakage Current
3-10
•
Ground Integrity
•
Electrical Leakage
This test checks the integrity of the power cord ground wire from the AC plug to
the instrument chassis ground. The current used for this test is < 6V RMS 50 or
60 Hz and 25 A.
1. Connect the monitor AC mains plug to the analyzer as recommended by the
analyzer operating instructions.
2. Connect the analyzer resistance input lead to the equipotential terminal
(grounding lug) on the rear panel of the instrument. Verify that the analyzer
indicates 100 milliohms or less.
The following tests verify the electrical leakage of the monitor:
•
Earth Leakage Current
•
Enclosure Leakage Current
•
Patient Leakage Current
•
Patient Source Current (Mains on Applied Part)
Note: For the following tests, ensure that the AC switch on the rear of the
instrument is configured for the AC voltage being supplied.
This test is in compliance with IEC 601-1 (earth leakage current) and AAMI
Standard ES1 (earth risk current). The applied voltage for AAMI ES1 is 120
VAC 60 Hz, for IEC 601-1 the voltage is 264 VAC 50 to 60 Hz. All
measurements shall be made with the power switch in both the "On" and "Off"
positions.
1. Connect the monitor AC plug to the electrical safety analyzer as
recommended by the analyzer operating instructions.
2. The equipotential terminal is not connected to ground.

Table 3-2: Earth Leakage Current Limits

LINE CORD
Normal Closed
Closed
Normal Open
Normal Closed
This test is in compliance with IEC 601-1 (enclosure leakage current) and AAMI
Standard ES1 (enclosure risk current). This test is for ungrounded enclosure
current, measured between enclosure parts and earth. The applied voltage for
NEUTRAL LEAKAGE
CORD CURRENT
Closed 500 µA
Closed 500 µA
Closed 1000 µA
Open 1000 µA