Fluke 225C Programming Reference Manual page 26

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Purpose:
Switches the instrument's power off. If a power adapter
is connected, you can use the SO command to switch power
on again. If there is no power adapter connected, the
instrument can only be switched on manually by pressing
the Power ON/OFF key.
Command Syntax:
GD<cr>
Response Syntax:
<acknowledge><cr>
Example:
Page 3.15
GET DOWN GD