Welch Allyn PROPAQ CS Service Manual page 20

16 Functional verification
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 parameters of the high voltage tester per the ECG input connector
specifications in the table below.
Table 4. Summary of connection points and high-voltage test parameters
Tester's high-voltage terminal
connection
ECG Input Connector: all ECG leads
connected together
Nurse Call Output Connector: Pins 1
and 3 connected together (use 008-
0634-XX cable)
2. Connect the high-voltage output lead of the tester to all ECG leads, using a dedicated
patient cable reserved for use only in such tests.
3. Connect the tester's chassis-connected return lead to the monitor's dc input
connector, using a suitable plug.
4. Apply the test voltage for one second. The tester must not indicate dielectric
breakdown.
If the monitor has the Nurse Call Option, continue with steps 5 to 8:
5. Remove the ECG connection from the monitor and the tester's high voltage output
lead.
6. Set the parameters of the high-voltage tester per the Nurse Call Output Connector in
the table
page 16 (be sure to reduce the test voltage).
7 . Connect a 008-0634-XX Nurse Call Cable to the Nurse Call Output Connector on the
monitor. Connect the open pins 1 and 3 of the cable to the high voltage output lead.
8. Apply the test voltage for one second and check that the tester does not alarm.
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.
Tester's grounded return
connection
DC input connector; all pins connected
together
DC input connector; all pins connected
together
WARNING If any dielectric breakdown occurs, do not use the monitor. All
internal sheet insulation barriers must be properly installed. Check the monitor to
determine the cause of dielectric breakdown; then repair the monitor or return
the monitor to Welch Allyn for repair.
"Summary of connection points and high-voltage test parameters"
Welch Allyn Propaq CS Vital Signs Monitor
High-voltage test parameters
Output: 4000 V ac rms
Current Limit: 2.5 mA
Ramp-up: 8 seconds
Dwell: 1 second
Output voltage: 1500 V ac rms
Output Current Limit: 2.5 mA
Ramp-up: 8 seconds
Dwell time: 1 second
on