Service manual

Maintenance
4-5
Chassis Leakage Current Tests
1. Plug the leakage analyzers into mains power.
2. Plug the equipment into the analyzer’s AC receptacle.
3. Verify that the leakage current from the chassis to ground is less than the values in Table 2.
Patient Lead Leakage Current Tests (Patient Modules)
Before you can perform the Patient Lead Leakage Current Test, verify that the monitor passes the
ground resistance and chassis current leakage tests. It is recommended that the equipment be
operating for 30 minutes prior to the test to allow thermal stabilization. If a 12-lead patient cable is
used with the module being tested, perform the tests using the 12-lead cable.
1. Patient Leads Current Leakage — measure the leakage current between each of the patient
leadwires and the ground lug on the monitor back panel. Also, measure the leakage current
between all combinations of ECG leads and ground. The current must be less than 10
µA
with the ground connected, and 50 µA with the ground open.
2. Leakage Current to Ground with 50/60 Hz — AC mains voltage applied to leads. Apply AC
mains voltage and measure the leakage current between each of the ECG leadwires and
the ground lug on the monitor back panel. The current must be less than 50 µA at any line
voltage.
Monitor Functional Tests
This procedure verifies operation of the Ethernet port, patient data logger, remote alarm, and
external SDLC options. It assumes that a multi-parameter module, either 90470 or 90496, is
available for testing purposes. In the event that these modules are not available, similar modules
may be substituted for verifying specific parameters.
Required Tools/Test Equipment
• Waveform simulator and appropriate patient cable.
• If patient data logger option is to be tested: terminal or computer with VT100 emulator and
appropriate standard PC cable to connect it to the properly configured DB9 serial port on the
monitor.
• Module housing (for 90385).
Table 2: Enclosure Leakage Test Conditions and Limits
Neutral
Condition
Ground
Condition
Polarity
International
Limit
Domestic
Limit
Closed neutral Closed ground Normal polarity 100 µA300 µA
Open neutral Open ground Normal polarity 500 µA300 µA
Closed neutral Open ground Normal polarity 500 µA300 µA