Section 1: Getting Started

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Notice that when you press the ´ or prefix key, an f or g annunciator appears and remains in the display until a function key is pressed to complete the sequence.

0.0000

f

Prefix Keys

A prefix key is any key which must precede another key to complete the key sequence for a function. Certain functions require two parts: a prefix key and a digit or other key. For your reference, the prefix keys are:

"^ • G f > i O m ´ P I l F T s ? t H b < _ X

If you make a mistake while keying in a prefix for a function, press ´ CLEAR u to cancel the error. The CLEAR ukey is also used to show the mantissa of a displayed number, so all 10 digits of the number in the display will appear for a moment after the ukey is pressed.

Changing Signs

Pressing (change sign) will change the sign (positive or negative) of any displayed number. To key in a negative number, press after its digits have been keyed in.

Keying in Exponents

(enter exponent) is used when keying in a number with an exponent. First key in the mantissa, then press and key in the exponent.

For a negative exponent press after keying in the exponent.* For example, to key in Planck's constant (6.6262×10-34Joule-seconds) and multiply it by 50:

*may also be pressed after and before the exponent, with the same result (unlike the mantissa, where digit entry must precede ).

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HP 15c Scientific manual Prefix Keys, Changing Signs, Keying in Exponents, I O m ´ P I l F T s ? t H b