Service manual

Service Manual Functional Verification 13
Risk (Leakage) Current Test
A risk (leakage) current test must be performed to verify that the patient remains
electrically isolated from the power circuits of the Encore.
Check leakage currents using a Dynatech/Nevada 431F-1D safety analyzer or its
equivalent. The source current should not exceed 10A rms. The sink current, measured
between the isolated patient connections (ECG) and the dc power input connector of the
monitor, should not exceed 20A rms. See the analyzer's operator's manual for the
proper safety check procedure.
Dielectric Strength (Hi-Pot) Test
Because of the close spacings of the monitor's internal components and the critical
positioning of the insulation sheet within the monitor, Welch Allyn recommends that a
dielectric strength test be performed following any procedure in which the monitor is
opened.
Use a Rod-L Model M100AVS5 high-voltage potential tester, or equivalent. Refer to the
Rod-L instruction manual for operating information and safety recommendations.
1. Set the high voltage potential of the tester as specified in the table below.
Note
A hi-pot test is only required if the monitor has been opened.
Note
Because of the all-insulated construction of the monitor, an Enclosure Leakage
Current Test to ground is not necessary.
Table 4. Electrical Connections for Patient Risk (Leakage) Current Safety Tests
Safety Test Power Adapter Monitor
dc Input
Monitor
Cable
Safety
Analyzer
Source current Plugged into analyzer
outlet
Connected to power
adapter
RA
LA
LL
C
RL
RA
LA
LL
C
RL
Sink current Not used Connected to ground
connector on analyzer
RA
LA
LL
C
RL
RA
LA
LL
C
RL
WARNING The Hi-Pot test is extremely hazardous. Only qualified service
personnel should perform this test. Conduct the test only on an insulated table
top, away from other people and equipment.