AMETEK Programmable Power Sorensen XPF Série Mode D'emploi page 17

Releasing the LOCK key at any time while the display is flashing will abort the LOCK cancellation.
Attempting to select a different range with LOCK enabled is not allowed; if attempted, the message
is shown briefly in the display and the LOCK lamp is also flashed. If the output is also on
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when these actions are attempted the message
(accompanied by the output lamp flashing) followed by the message
lamp flashing).
The LOCK status at power on is the same as at last power off.
16
If the output is still on,
display, followed by flashing of the new 'unlocked' settings for 2-3
seconds (slowly at first, then faster) before the change is finally
implemented; the LOCK lamp goes off when the change is made.
turn oFF
OP on (output on) will flash twice in the
is first shown in the display
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(with the LOCK