HP 12c Owners Manual

							  Appendix D: Formulas Used  191 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 191 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Interest Rate Conversions 
C  = number of compounding periods per year. 
EFF  = the effective annual interest rate as a decimal. 
NOM  = the nominal annual interest rate as a decimal. 
 
Finite Compounding 
1 1−
⎟
⎠ ⎞
⎜
⎝ ⎛
+ =
C
C NOM
EFF 
Continuous Compounding 
) 1 (− =NOMe EFF 
Statistics 
Mean 
n
xx∑=   n
yy∑= 
Weighted M ean 
∑ ∑=
w wxxw 
Linear Estimation 
n = number of data pairs 
BxAy+=ˆ 
B
Ayx−
=ˆ 
where 
()
nx
xny x
xy
B
2
2∑
∑
∑∑∑
−⋅
−
=
 
xByA−=  
						

							192  Appendix D: Formulas Used 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 192 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
()()
⎥ ⎥
⎦ ⎤
⎢ ⎢
⎣ ⎡
− ⋅
⎥ ⎥
⎦ ⎤
⎢ ⎢
⎣ ⎡
−⎥
⎦ ⎤
⎢
⎣ ⎡⋅
−
=∑∑
∑∑ ∑
∑∑
ny
y
nx
xny x
xy
r
2
2 2
2 
Standard Deviation 
()
) 1 (
2
2
− −
=
∑ ∑
n nx x n
sx  ()
) 1 (
2
2
− −
=
∑ ∑
n ny y n
sy 
Factorial 
0! = 1 
For n > 1 where n is an integer: 
∏=
=
n
i
i n
1
! 
The Rent or Buy Decision 
Market Value = PRICE(1 + I)n  
where: 
I= appreciation per year (as decimal) 
n= number of years 
 
Net Cash Proceeds on Resale = Market Value – Mortgage Balance – Commission 
The interest rate is obtained by solving the financial (compound interest) equation 
for i using: 
n = number of years house is owned 
PV = down payment + closing costs 
PMT
= mortgage payment + taxes + maintenance 
–rent – (% tax) 
(interest + taxes) 
FV = net cash proceeds on resale 
Annual interest rate = 12 × i  
						

							 
193 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 193 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
  Appendix E 
Battery, Warranty, and 
Service Information 
Battery 
The hp 12c is shipped with one 3 Volt CR2023 Lithium battery. Battery life 
depends on how the calculator is used. If the calculator is being used to perform 
operations other than running programs, it uses much less power. 
Low-Power Indication 
A battery symbol (¼
) shown in the upper-left corner of the display when the 
calculator is on signifies that the available battery power is running low. When the 
battery symbol begins flashing, replace the battery as soon as possible to avoid 
losing data. 
Use only a fresh battery. Do not use rechargeable batteries. 
Warning 
 There is the danger of explosion if the battery is 
incorrectly replaced. Replace only with the same or 
equivalent type recommended by the manufacturer. 
Dispose of used batteries according to the 
manufacturer’s instructions. Do not mutilate, puncture, 
or dispose of batteries in fire. The batteries can burst or 
explode, releasing hazardous chemicals. Replacement 
battery is a Lithium 3V Coin Type CR2032. 
Installing a New Battery 
The contents of the calculator’s Continuous Memory are preserved for a short time 
while the battery is out of the calculator (provided that you turn off the calculator 
before removing the battery). This allows you ample time to replace the battery 
without losing data or programs. If the battery is left out of the calculator for an 
extended period, the contents of Continuous Memory may be lost.  
						

							194  Appendix E: Battery, Warranty, and Service Information 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 194 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
To install a new battery, use the following procedure: 
 
1.  With the calculator turned off, slide the battery cover off. 
2.  Remove the old battery. 
3.  Insert a new battery, with positive polarity facing outward. 
4.  Replace the battery cover. 
Note:
 Be careful not to press any keys while the battery is out of the calculator. If 
you do so, the contents of Continuous Memory may be lost and keyboard control 
may be lost (that is, the calculator may not respond to keystrokes). 
5.  Replace the battery compartment cover and press ; to turn on the power. 
If for any reason Continuous Memory has been reset (that is, if its contents 
have been lost), the display will show Pr Error. Pressing any key will clear 
this message. 
Verifying Proper Operation (Self-Tests) 
If it appears that the calculator will not turn on or otherwise is not operating 
properly, use one of the following procedures. 
For a calculator that does respond to keystrokes: 
1.  With the calculator off, hold down the ; key and press §. 
2. Release the ; key, then release the § key. This initiates a complete test of 
the calculator’s electronic circuitry. If everything is working correctly, within 
about 25 seconds (during which the word running flashes) the display 
should show –8,8,8,8,8,8,8,8,8,8, and all of the status indicators (except  
						

							  Appendix E: Battery, Warranty, and Service Information  195 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 195 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
the ¼ battery power indicator) should turn on.*  If the display shows Error 9, 
goes blank, or otherwise does not show the proper result, the calculator 
requires service.
† 
Note: Tests of the calculator’s electronics are also performed if the = key 
or the z key is held down when ; is released.
‡  These tests are included 
in the calculator to be used in verifying that it is operating properly during 
manufacturing and service. 
If you had suspected that the calculator was not working properly but the proper 
display was obtained in step 2, it is likely that you made an error in operating the 
calculator. We suggest you reread the section in this handbook applicable to your 
calculation — including, if appropriate, appendix A. If you still experience 
difficulty, write or telephone Hewlett-Packard at an address or phone number listed 
under Service (Page 197). 
                                                 
* The status indicators turned on at the end of this test include some that normally are not 
displayed on the hp 12c. 
† If the calculator displays Error 9 as a result of the ;/µ test or the ;/+ test but you 
wish to continue using your calculator, you should reset Continuous Memory as described on 
page 70. 
‡ The ;/= combination initiates a test that is similar to that described above, but continues 
indefinitely. The test can be terminated by pressing any key, which will halt the test within 25 
seconds. The ;/z combination initiates a test of the keyboard and the display. When the 
; key is released, certain segments in the display will be lit. To run the test, the keys are 
pressed in order from left to right along each row, from the top row to the bottom row. As 
each key is pressed, different segments in the display are lit. If the calculator is operating 
properly and all the keys are pressed in the proper order, the calculator will display 12 after 
the last key is pressed. (The \ key should be pressed both with the third-row keys and with 
the fourth-row keys.) If the calculator is not working properly, or if a key is pressed out of 
order, the calculator will display Error 9. Note that if this error display results from an 
incorrect key being pressed, this does not indicate that your calculator requires service. This 
test can be terminated by pressing any key out of order (which will, of course, result in the 
Error 9 display). Both the Error 9 display and the 12 display can be cleared by pressing 
any key.  
						

							196  Appendix E: Battery, Warranty, and Service Information 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 196 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Warranty 
hp 12c Financial Calculator; Warranty period: 12 months 
1.  HP warrants to you, the end-user customer, that HP hardware, accessories 
and supplies will be free from defects in materials and workmanship after the 
date of purchase, for the period specified above. If HP receives notice of 
such defects during the warranty period, HP will, at its option, either repair 
or replace products which prove to be defective. Replacement products may 
be either new or like-new. 
2.  HP warrants to you that HP software will not fail to execute its programming 
instructions after the date of purchase, for the period specified above, due to 
defects in material and workmanship when properly installed and used. If HP 
receives notice of such defects during the warranty period, HP will replace 
software media which does not execute its programming instructions due to 
such defects.   
3.   HP does not warrant that the operation of HP products will be uninterrupted 
or error free. If HP is unable, within a reasonable time, to repair or replace 
any product to a condition as warranted, you will be entitled to a refund of 
the purchase price upon prompt return of the product. 
4.  HP products may contain remanufactured parts equivalent to new in 
performance or may have been subject to incidental use. 
5.  Warranty does not apply to defects resulting from (a) improper or 
inadequate maintenance or calibration, (b) software, interfacing, parts or 
supplies not supplied by HP, (c) unauthorized modification or misuse, (d) 
operation outside of the published environmental specifications for the 
product, or (e) improper site preparation or maintenance. 
6.  HP MAKES NO OTHER EXPRESS WARRANTY OR CONDITION WHETHER 
WRITTEN OR ORAL. TO THE EXTENT ALLOWED BY LOCAL LAW, ANY 
IMPLIED WARRANTY OR CONDITION OF MERCHANTABILITY, 
SATISFACTORY QUALITY, OR FITNESS FOR A PARTICULAR PURPOSE IS 
LIMITED TO THE DURATION OF THE EXPRESS WARRANTY SET FORTH 
ABOVE. Some countries, states or provinces do not allow limitations on the 
duration of an implied warranty, so the above limitation or exclusion might 
not apply to you. This warranty gives you specific legal rights and you might 
also have other rights that vary from country to country, state to state, or 
province to province. 
7.  TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS 
WARRANTY STATEMENT ARE YOUR SOLE AND EXCLUSIVE REMEDIES. 
EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL HP OR ITS SUPPLIERS 
BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, 
CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER 
DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE.  
						

							  Appendix E: Battery, Warranty, and Service Information  197 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 197 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Some countries, States or provinces do not allow the exclusion or limitation 
of incidental or consequential damages, so the above limitation or exclusion 
may not apply to you. 
8.  The only warranties for HP products and services are set forth in the express 
warranty statements accompanying such products and services. Nothing 
herein should be construed as constituting an additional warranty. HP shall 
not be liable for technical and editorial errors or omissions contained herein. 
FOR CONSUMER TRANSACTIONS IN AUSTRALIA AND NEW ZEALAND: THE 
WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE 
EXTENT LAWFULLY PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY 
AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS 
APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU. 
Service 
Europe Country : Telephone numbers 
 Austria +43-1-3602771203 
 Belgium  +32-2-7126219 
 Denmark +45-8-2332844 
 Eastern Europe countries +420-5-41422523 
 Finland  +35-89640009 
 France  +33-1-49939006 
 Germany +49-69-95307103 
 Greece  +420-5-41422523 
 Holland  +31-2-06545301 
 Italy  +39-02-75419782 
 Norway  +47-63849309 
 Portugal  +351-229570200 
 Spain  +34-915-642095 
 Sweden  +46-851992065 
 Switzerland +41-1-4395358 (German) 
+41-22-8278780 (French) 
+39-02-75419782 (Italian) 
 Turkey  +420-5-41422523 
 UK  +44-207-4580161 
 Czech Republic +420-5-41422523 
 South Africa +27-11-2376200 
 Luxembourg +32-2-7126219 
 Other European countries +420-5-41422523 
  
						

							198  Appendix E: Battery, Warranty, and Service Information 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 198 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Asia Pacific Country : Telephone numbers 
 Australia +61-3-9841-5211 
 Singapore +61-3-9841-5211 
    
L.America Country : Telephone numbers 
 Argentina 0-810-555-5520 
 Brazil  Sao Paulo 3747-7799; ROTC 
0-800-157751 
 Mexico  Mx City 5258-9922; ROTC 
01-800-472-6684 
 Venezuela 0800-4746-8368 
 Chile  800-360999 
 Columbia 9-800-114726 
 Peru  0-800-10111 
 Central America & 
Caribbean 1-800-711-2884 
 Guatemala 1-800-999-5105 
 Puerto Rico 1-877-232-0589 
 Costa Rica 0-800-011-0524 
 
N.America Country : Telephone numbers 
 USA  1800-HP INVENT 
 Canada (905)206-4663 or  
800-HP INVENT 
 ROTC = Rest of the country 
Please logon to http://www.hp.com for the latest service and support information.  
						

							  Appendix E: Battery, Warranty, and Service Information  199 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 199 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Regulatory Information 
This section contains information that shows how the hp 12c financial calculator 
complies with regulations in certain regions. Any modifications to the calculator 
not expressly approved by Hewlett-Packard could void the authority to operate the 
12c in these regions. 
USA 
This calculator generates, uses, and can radiate radio frequency energy and may 
interfere with radio and television reception. The calculator complies with the limits 
for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are 
designed to provide reasonable protection against harmful interference in a 
residential installation. 
However, there is no guarantee that interference will not occur in a particular 
installation. In the unlikely event that there is interference to radio or television 
reception(which can be determined by turning the calculator off and on), the user 
is encouraged to try to correct the interference by one or more of the following 
measures: 
z  Reorient or relocate the receiving antenna. 
z  Relocate the calculator, with respect to the receiver. 
Canada
 
This Class B digital apparatus complies with Canadian ICES-003. 
Cet appareil numerique de la classe B est conforme a la norme NMB-003 du 
Canada. 
Japan
 
この装置は、情報処理装置等電波障害自主規制協議会
(VCCI)の基準
 
に基づく第二情報技術装置です。この装置は、家庭環境で使用することを目的とし
ていますが、この装置がラジオやテレビジョン受信機に近接して使用されると、受
信障害を引き起こすことがあります。
 
取扱説明書に従って正しい取り扱いをしてください。
 
Temperature Specifications 
z Operating: 0º to 55º C (32º to 131º F) 
z Storage: –40º to 65º C (–40º to 149º F) 
Noise Declaration 
In the operator position under normal operation (per ISO 7779): LpA < 70dB.  
						

							200  Appendix E: Battery, Warranty, and Service Information 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 200 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Disposal of Waste Equipment by Users in Private 
Household in the European Union 
This symbol on the product or on its packaging indicates that this 
product must not be disposed of with your other household waste. 
Instead, it is your responsibility to dispose of your waste 
equipment by handing it over to a designated collection point for 
the recycling of waste electrical and electronic equipment. The 
separate collection and recycling of your waste equipment at the 
time of disposal will help to conserve natural resources and ensure 
that it is recycled in a manner that protects human health and the environment. For 
more information about where you can drop off your waste equipment for 
recycling, please contact your local city office, your household waste disposal 
service or the shop where you purchased the product.