GE Corometrics 250cx Series Service Manual page 71
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3. Turn on the safety analyzer and set it to measure the ground resistance.
4. Measure the resistance between the ground (earth) terminal of the Power Inlet Module and the
Equipotential Lug on the rear side of the monitor unit. The resistances shall be 100mΩ or less.
3.3.7.3 Ground (Earth) Leakage Current and Enclosure Leakage Current Checks
Perform this check on the monitor unit only, with no other equipment (peripherals) attached.
1. Connect the monitor power cord to the safety analyzer.
2. Verify that the AC power cord of the safety analyzer is plugged into an appropriate wall outlet.
3. Turn on the safety analyzer and set it to measure the ground leakage current.
4. Turn on the monitor unit.
5. In normal conditions and in all possible operating modes, the ground leakage current shall be 300 μA or
less.
6. If required by local ordinances, in single-fault conditions and in all possible operating modes, the ground
leakage current shall be 500 μA or less.
7. Set the safety analyzer to measure the enclosure (chassis) leakage current (Use the Equipotential Lug in the
rear side of the monitor for the chassis connection of the safety analyzer).
8. In normal conditions and in all possible operating modes, the enclosure leakage current shall be 100 μA or
less.
9. If required by local ordinances, in single-fault conditions and in all possible operating modes, the enclosure
leakage current shall be 300 μA or less.
3.3.7.4 Patient-to-Ground (Patient Source) and Patient-to-Line (Patient Sink) Leakage Current Checks
Perform this check on the monitor unit only, with no other equipment (peripherals) attached. Table 3-1 lists the
maximum allowable patient (source/sink) leakage currents for different applied parts.
1. Connect an ECG test body (e.g. ECG cable with all its leads shorted together) to the ECG input of the monitor.
2. Connect the monitor power cord to the safety analyzer.
3. Verify that the AC power cord of the safety analyzer is plugged into an appropriate wall outlet.
4. Attach the External clamp of the safety analyzer to the test body.
5. Turn on the safety analyzer and configure it to measure the patient (source/sink) leakage currents.
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Chapter 3: Maintenance and Checkout
2036947-001
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