Calibrating Realtime Ecg Out - Welch Allyn PROPAQ CS Service Manual

50 Calibration

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 layoutdigital board layout
Welch Allyn Propaq CS Vital Signs Monitor
P 9
U 31
TP 4
3
P
Pin 6