Welch Allyn PROPAQ CS Service Manual page 56

52 Calibration
11. Connect the oscilloscope reference lead to TP43 or TP1 on the Analog Board.
12. Check for ≤15 mV peak-to-peak noise.
Note
13. Disconnect all patient inputs to the monitor's left side panel.
Measure the low frequency noise (bounce) only. Make the peak-to-peak
measurement from the center-to-center of the trace to disregard the "fuzzy" high
frequency noise.
Welch Allyn Propaq CS Vital Signs Monitor