Philips V24CT User's Reference Manual page 182

Delayed Recording
For Central
Monitor Setup
Recorders
6-10 Recording Functions
System Waves
1. Select the central recorder in the Delayed/Alarm Recording Task
Window (see steps 1-3 for Plug-In and 4-Channel Bedside
Recorders above).
2. Select the waves in the System Waves Task Window
a. Press Change Primary
Change Primary
available. In this case the primary wave is always ECG-CH1.
b. Press Change Second
c. Press
Confirm
d. Press
Main Screen
display.
.
On/Off Waves
to select the primary wave. The
key does not function if an ECG wave is
to select secondary wave.
to store the selected wave.
to return to the standard monitoring