Welch Allyn PROPAQ CS - Manual (Page 19)

Service Manual Functional verification 15
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.
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 10
μA rms. The sink current, measured
between the isolated patient connections (ECG) and the dc power input connector of the
monitor, should not exceed 20
μA rms. See the analyzer's operator's manual for the
proper safety check procedure.
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 3. 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 (power adapter
switch on) 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