Safety Tests - Welch Allyn PROPAQ CS Service Manual

Service Manual

Safety tests

The following two safety tests, a risk (leakage) current safety check and a dielectric
strength integrity (hi-pot) test, must be performed whenever the monitor has been
opened for calibration or repair.
Note
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 monitor.
Check leakage currents using a Fluke (Dynatech/Nevada) 431F-1D safety analyzer or its
equivalent. The source current should not exceed 10μA rms. The sink current, measured
between the isolated patient connections (ECG) and the dc power input connector of the
monitor, should not exceed 20μA rms. See the analyzer's operator's manual for the
proper safety check procedure.
Note
Table 3. Electrical connections for patient risk (leakage) current safety tests
Safety test
Source current
Sink current
A hi-pot test is only required if the monitor has been opened.
Because of the all-insulated construction of the monitor, an Enclosure Leakage
Current Test to ground is not necessary.
Power adapter
Plugged into analyzer
outlet (power adapter
switch on)
Not used
Monitor dc input Monitor cable
Connected to power
adapter
Connected to ground
connector on analyzer
Functional verification
Safety analyzer
RA RA
LA LA
LL LL
C C
RL RL
RA RA
LA LA
LL LL
C C
RL RL
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