SMC Networks D-MH1AD Series Operation Manual page 62

<Operation – With security code>
•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) Press the UP or DOWN button to select Lock [LoC] and then press the SET button to enable the setting.
•Unlocking
(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) Press the UP or DOWN button to select Unlock [UnL] and then press the SET button to enable the
setting. Security code entry is required.
(3) For instructions on how to enter a security code, refer to "How to enter and change the security code"
)
(page 62 .
(4) If the entered security code is correct, the main display indicates [UnL] and pressing any of the UP,
SET, and DOWN buttons disables the key lock and the device returns to measurement mode.
If the security code entered is incorrect, [FAL] will be displayed, and the security code must be entered
again.
If the wrong security code is entered 3 times, [LoC] is displayed and the device returns to
measurement mode.
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