User Manual

3.3 Common Operations
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Chapter 3 Operation Overview
All operating keys on the front panel are disabled. This can prevent unintended
operations during measurement.
The External I/O terminals are unaffected by the key-lock state.
3.3.7 Disabling Key Operations (Key-Lock Func-
tion)
Disabling key operation
Hold both CURSOR keys simultaneously fo
r
three seconds.
The key-lock state is enabled.
(“Key Lock” is displayed at the upper right.)
Canceling
Again hold both CURSOR keys simulta
-
neously for three seconds.
• If the backlight has been turned off by the backlight saver function (⇒ p. 344),
pressing any key still turns the backlight on. However, other key operations
remain disabled.
• If a USB mouse is connected, mouse operations are not disabled. To disable
the mouse, unplug it.