Hioki 3532-50 - Key Lock Function; Turning the Key Lock on and off

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4.25 Key Lock Function
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4.25.1 Turning the Key Lock On and Off
OFF
ON
NOTE
4.25 Key Lock Function
When the key lock function is turned on, all of the keys become inoperative,
so that no control via the touch panel is possible, and the values of the
settings are all frozen and preserved.
This function is activated using the key lock switch on the rear panel of the
3532-50 unit.
The key lock function can only be used when the screen is displaying the
Initial screen, Comparator screen, Scaling screen, Magnification display
screen, or Continuous test screen.
In the case of external triggering, the key lock does not apply to the
button.
Even if the power supply is interrupted, the key lock function is not
canceled.
The key lock function can be turned on and off via the EXT I/O connector.
For details, see Section 5.5, "The EXT I/O Connector."