Texas Instruments PLUS TI-89 - Manual (Page 100)

Chapter 4: Constants and Measurement Units 83
04UNITS DOC TI-89/92Plus: Constants and Measurement Units (English) Susan Gullord Revised: 02/23/01 10:54 AM Printed: 02/23/01 2:12 PM Page 83 of 12
The following shows how to select a unit, but you can use the same
general procedure to select a constant.
From the Home screen:
1. Type the value or expression.
6.3
2. Display the UNITS dialog box.
Press:
TI . 89: 2 À
TI . 92 Plus: ¥ 9
3. Use D and C to move the cursor
to the applicable category.
4. To select the highlighted (default)
unit, press ¸.
– or –
To select a different unit from the
category, press B. Then highlight
the applicable unit, and press
¸.
The selected unit is placed in the
entry line. Constant and unit names
always begin with an underscore (
_ ).
6.3_pF
If you know the abbreviation that the TI -89 / TI-92 Plus uses for a
particular constant or unit (refer to the list that begins on page 89),
you can type it directly from the keyboard. For example:
256_m
The first character must be an underscore ( _ ). For _, press:
TI . 89: ¥ 
TI . 92 Plus: 2 
¦ A space or a multiplication symbol ( ù ) before the underscore is
optional. For example, 256_m , 256 _m , and 256 ù _m are
equivalent.
−
However, if you are adding units to a variable, you must put a
space or ù before the underscore. For example,
x_m is treated
as a variable, not as x with a unit.
Entering Constants or Units
You can use a menu to select from a list of available constants
and units, or you can type them directly from the keyboard.
From a Menu
Tip: Use 2 D and 2 C
to scroll one page at a time
through the categories.
Note: If you created a user-
defined unit for an existing
category (page 88), it is
listed in the menu.
From the Keyboard
Note: You can type units in
either uppercase or
lowercase characters.
You can also move the
cursor by typing the first
letter of a unit.