Service manual

Section 3: Performance Verification

3-10

• Ground Integrity

• Electrical Leakage

3.4.1 Ground Integrity

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.

3.4.2 Electrical Leakage

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.

3.4.2.1 Earth Leakage Current

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

POLARITY

LINE CORD NEUTRAL

CORD

LEAKAGE

CURRENT

Normal Closed Closed 500 µA

Reversed Closed Closed 500 µA

Normal Open Closed 1000 µA

Normal Closed Open 1000 µA

3.4.2.2 Enclosure Leakage Current

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