BIRD AT-400 Antenna Tester AT-400, Operator'S Manual, Page: 15 / 57

Introduction
3
3. Cursor Keys
Left Arrow
Press in swept frequency mode to move
the cursor to the left. Press during data
entry to erase data.
Right Arrow
Press in swept frequency mode to move
the cursor to the right.
Up Arrow
Moves the cursor to the maximum
point on the displayed trace. Press
during data entry to increase numeric
data.
Down Arrow
Moves the cursor to the minimum
point on the displayed trace. Press
during data entry to decrease numeric
data.
4. Backlight Key
Turns the backlight on or off. Backlight
is on a timer to increase battery life.
5. On Key
Press to turn tester on, press and hold
to turn tester off.
6. +/- Key
Toggles between positive and negative
numbers.
7. Enter Key
Completes data entry.
8. ESC Key
Back up through menu structure. At
the top menu level, blanks menu. Exits
data entry without saving changes.
9. Menu Key
Displays software menu and enables
menu select keys.
10. Select Key
Allows current parameter, indicated by
flashing cursor, to be changed. Press
again to enable the next parameter to
be changed.
11. Numeric Keys
Input numeric values.
12. Menu Select
Keys
Used to access the menu sections
described directly above them. Can
also be used to scroll through available
settings in a particular parameter.
13. Test Port
Connect antenna or antenna lead.
14. Serial Port
Connect communication cable to allow
data transfer to a PC.