OWON AG-S series - Manual (Page 41)

5.Front Panel Operation
Note:
The amplitude of the [20MHz In] input signal must be over 1V.
(1)
Press Utility and choose System, press F4 to enter the second page of the
menu.
(2)
Press F3 to select CLK Sou.
(3)
Press F3 to switch between Internal/External.
To Use Built-in Help
(1)
Press Help function button, the catalog will display in the screen.
(2)
Press F1 or F2 to choose help topic, or just turn the knob to choose.
(3)
Press F3 to view the details about the topic; press F5 to go back to the
catalog.
(4)
Press Help again to exit the help, or just do other operations.
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