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50 Calibration Welch Allyn Propaq CS Vital Signs Monitor
Calibrating realtime ECG out
1. Connect the 5-lead ECG cable to the monitor and the simulator.
2. Set the simulator to 80 bpm, normal sinus rhythm.
3. Set the monitor to Lead II.
4. Connect the dc-coupled oscilloscope probe to P9 pin 6 on the Digital PCB, and the
reference probe to TP4 on the Digital PCB.
5. On the Analog Board, carefully short together U55 pins 1 and 2.
6. Adjust RP6 on the Analog PCB to 0.0 ± 0.1 V dc.
7. Remove the short and check for an ECG signal displayed on the oscilloscope of 1.0 ±
0.1 V baseline to peak of the R-wave.
8. Disconnect the ECG cable from the monitor.
Figure 4. Digital PCB measurement and adjustment locations
digital board la youtdigital board layout
P9
U31
P3
TP4
Pin 6