Welch Allyn Propaq Encore, Service Manual

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Service Manual Calibration 39
8. Disconnect the DMM leads.
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 the Digital board at P9 pin 6, and the
reference probe to TP4 on the Digital board .
5. On the Analog board, carefully short together U55 pins 1 and 2.
6. Adjust RP6 on the Analog board to 0V dc ± 0.1V.
7. Remove the short and check for an ECG signal displayed on the oscilloscope of 1.0V±
0.1V baseline to peak of the R-wave.
8. Disconnect the ECG cable from the monitor.
+VB TP43 or TP1 TP13 +5.40 to +6.10
+5.6 TP43 or TP1 TP33 +5.55 to +5.70
IBP shield TP43 or TP1 P6, Pin 10 +2.47 to +2.53
C.L.P. detector
a
TP43 or TP1 U5, Pin 1 0.00 to +0.25
NIBP Pressure Offset TP43 or TP1 TP31 +2.40 to +2.60
OSC baseline TP43 or TP1 TP47 -0.95 to -1.25
+VA TP43 or TP1 TP7 (+VR + 0.1V) to (+VR + 0.2V)
-VA TP43 or TP1 TP15 (+VR + 0.2V) to -(VR + 0.35V)
+2.5 TP43 or TP1 TP17 +2.48 to+2.52V
a. Make sure the ECG input connector (P5) is disconnected from the analog board for this
measurement. Reconnect when done.
Table 11. Main Power Supply Voltage Checks
Supply Voltages Ref. Lead Pos. Lead Voltage Limits
P9
PIN 6
TP4
GND