Philips PM3320 Operating Manual page 72

4-52E
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If pushbutton CLEAR is pushed and dots are selected for display, a
zero line is written into the accumulator (RO) and no traces are
displayed on the screen.
If DOTS is off or SMOOTH is selected for display and pushbutton
CLEAR is pushed, a zero line is written into the accumulator (RO) and
displayed on the C.R.T. screen.
The cleared contents of the accumulator can be saved in one of the
other registers R1..R3, to clear the contents of these registers.
When pushbutton CLEAR is pushed during a SINGLE-shot, a
MULTIPLE-shot or a ROLL-mode operation, the CLEAR pushbutton
has a RESET function.
The function CLEAR is not possible in the LOCK mode.
If pushbutton SAVE/PLOT is pushed, the SAVE/PLOT menu is
displayed. See 4.2.9.1.