SMC Networks PF3A703H-L Operation Manual page 68

●Key-lock function
The key lock function is used to prevent errors occurring due to unintentional changes of the set values. If S
button is pressed while the keys are locked, [LoC] is displayed on the sub display (left) for approximately
1 second.
(Each setting and peak/ bottom values are displayed with ▲ and ▼ buttons.)
<Operation – Without security code input>
(1) Press the S 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 [UnLoC] will be displayed on the sub display.
(To release key-lock repeat the above operation)
(2) Select the key locking/un-locking using the ▲ or ▼ button, and press the S button to set.
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No.PF※※-OMX0002