SMC Networks ISE70G-N02-L2 Operation Manual page 58

<Operation – With security code input ->
•Locking
(1) Press the SET button for 5 seconds or longer in measurement mode. When [oPE] is displayed on the
main display, release the button.
The current setting [LoC] or [UnL] will be displayed on the sub display.
(2) Select the key [LoC] with UP or DOWN button, and press the SET button to set.
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No.PS※※-OMV0004-H