GE Dash 3000 Service Manual page 81

Revision A
Maintenance: Electrical Safety Tests
Compliance is checked by the following steps:
1. A current not less than 10A and not exceeding 25A from a current
source with a frequency of 50 or 60 Hz with a no-load voltage not
exceeding 6 V is passed for at least 5 s through the protective earth
terminal or the protective earth pin in the mains plug and each
accessible metal part which could become live in case of failure in
basic insulation.
2. The voltage drop between the parts described is measured and the
impedance determined from the current and voltage drop. It shall not
exceed the values indicated.
For equipment without a power supply cord the impedance between the
protective earth terminal and any accessible metal part which is
protectively earthed shall not exceed 0.1 ohms
For equipment with a power supply cord the impedance between the
protective earth pin in the mains plug and any accessible metal part
which is protectively earthed shall not exceed 0.2 ohms.
When taking this measurement, move the unit's power cord around.
There should be no fluctuations in resistance.
Dash 3000/4000 Patient Monitor
2000966-339
4-27