2-20 System Overview 
Measurement, Comment, and Body Mark Operations 
Enter or exit the general measurement mode. 
Enter/ exit the application measurement mode. 
Enter/ exit the textual comment status. 
Enter/ exit the arrow comment status. 
Clear the measurement caliper, comments and 
body mark. 
Press <Clear> to clear the selected item, return to 
the previous operation or to delete the last project. 
Long press <Clear> to delete the mode related 
elements or all elements on the screen. 
Other Operations 
Enter/ exit ECG control screen. 
Freeze/ unfreeze the image. 
Tip: ―/‖ means the key / knob has no silk-printed name.