Calculated-industries 3420 User Guide Manual de usuario descargar pdf (Pagina 7)

6 — Q

UALIFIER

LUS

III

KEY DEFINITIONS

Basic Operation Keys

O Turns all power off. The memory and most financial

registers are cleared.

o If calculator is off, turns power on. If calculator is on,

a single press clears the last entry while a second

press in succession clears non-permanent entries.

+ – x Arithmetic operation keys.

÷ =

0 – 9 Keys used for entering numbers.

) Triple-zero key (saves time when entering 000

values).

b Backspace key (deletes incorrect entries one digit at

a time).

• Decimal point.

Percent

— Four-function (+, –, x, ÷) percent key.

See page 22 for examples.

Memory

— Adds the displayed number to the inde-

pendent cumulative memory. Pressing s µ

(M–)

will subtract the displayed value from the

cumulative memory. Pressing ® µ recalls and

displays the memory contents. Pressing ® ®

clears the memory. See page 19 for details.

Recall

— Recalls and displays the contents of the

financial registers (e.g., ® ˆ). Also used for

Memory functions.

s Used to set the number of displayed decimal places

(see section on Decimal Place Selection, page 15).

Also works with other keys to set or activate addi-

tional functions. (Think of it as a “shift” key on a

typewriter.) It will perform the function printed above

the key on the calculator's face.

s –

Change Sign

— Changes the sign of the displayed

value from positive to negative or vice versa.

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