SMC Networks PFM3 Series Operation Manual page 49

•Unlocking
(1) Keep pressing the button for 5 seconds or longer in the measurement
mode. [LoC] is indicated.
(2) Press the or
(3) When the button is pressed, the input of security code is asked.
For how to input the secret code, refer to [How to input and change
the security code] on page 49.
(4) If inputted security code is correct, the indication changes to [UnL], and pressing one of
button releases key lock and returns the measurement mode. If inputted security code is wrong,
[FAL] is indicated and the security input mode is returned. If the wrong security code is inputted three
times, [LoC] is indicated and the measurement mode is returned.
button to select unlocking of the key [UnL].
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