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3M
™
Advanced Systems Tester 900AST Series
3
Keypad
The 900AST tester keypad has twelve yellow and
red “Control Keys” and nine blue “Function Keys”.
Additional blue keys on the keypad are reserved for
future expansion and have no designation or current
function.
Control Keys
Use the red and yellow keys to control and setup the
900AST tester and its functions.
Use the [Return] key to return to a previous
step in a function.
Use the [Contrast] key to adjust the contrast
or to turn the backlight on or off.
Use the [Save] key for storing TDR traces.
Use the [On/Off] key to turn the 900AST
power on or off (also see “Power Down
Timeout”).
Use the [Tab] key to select between
different options.
Use the [Setup] key to change the setup of a
function.
Use the [Help] key to get context sensitive
help with any screen or function.
Use the [Enter] key to accept changes or
move to the next step in a function. To
insert a space to the left of the cursor press
enter.
Use the [Up] and [Down] keys to
scroll to different menu options
or insert/delete characters when
editing.
Use the [Left] and [Right] keys to
select different options or move the
TDR cursor