Philips Avalon CTS M2720A, Service Manual

Page: 58 / 110

6 Preventive Maintenance and Safety Safety Tests
52
Description of Applicable Safety Tests
Abbreviations
S(1): Protective Earth Test
Test to perform:
The protective earth test measures impedance of Protective Earth (PE) terminal to all exposed metal parts
of Instrument under Test (IUT), which are connected to the Protective Earth (PE) for safety reasons.
Normally it includes the wiring in the mains cable (max. 200 mOhm).
A test current of 25 Amps is applied for five to ten seconds. It is recommended to flex the main cable
during the test to identify potential bad contact or damage to the earth wire.
Safety Test according to IEC 60601-1 (Clause 18).
Report the highest value.
S(2): Enclosure Leakage Current Test
- Normal Condition (NC)
Test to perform:
The enclosure leakage current: normal condition is applicable to Class 1 and 2 equipment, type B, BF,
and CF Applied Parts. The test measures leakage current of exposed metal parts of the Instrument Under
Test; it tests normal and reversed polarity.
For Type BF and CF Applied Parts the test measures AP/GND.
Safety Test according to IEC 60601-1 (Clause 19.4g).
Report the highest value.
AP: Applied Parts IUT: Instrument Under Test
GND: Ground PE: Protective Earth
50 Hz 25 A or 1.5 Ir
Ohm
L (N)
N (L)
PE
Instrument under test
Applied part
Insulating pad
Ri
6V
(*)
(*) If equipotential connection present : measure also
with yellow/green E.P. conductor connected.
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