Description Of Applicable Safety Tests; S(1): Protective Earth Test; S(2): Enclosure Leakage Current Test - Normal Condition (Nc) - Philips Avalon CTS M2720A Service Manual

6 Preventive Maintenance and Safety

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.
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AP: Applied Parts
GND: Ground
Ri
Ohm
50 Hz
or call 1-800-674-3655
IUT: Instrument Under Test
PE: Protective Earth
Instrument under test
L (N)
N (L)
PE
(*)
6V
Insulating pad
25 A or 1.5 Ir (*) If equipotential connection present : measure also
with yellow/green E.P. conductor connected.
Safety Tests
Applied part