ba-35 solar quick reference guide table of contents ... · pdf file2 ba35eng.doc ba-35 solar...

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BA35ENG.DOC BA-35 Solar Quick Reference GuidePat Hatcher Revised: 05/08/00 1:13 PM Printed:05/08/00 1:13 PM of 38

BA-35 Solar Quick Reference Guide

Table of Contents

General Information .......................... 2The Display ................................... 4Arithmetic Operations ........................ 6Correcting Errors ............................. 7Display Formats .............................. 8Memory Operations .......................... 9Math Operations.............................. 10Percentage Calculations ..................... 12Percentage Change Calculations............ 13Margin and Markup Calculations ............ 14Compound Interest Calculations............. 16Annuity Calculations.......................... 18Converting to EFF or APR ................... 23Balance, Interest, and Principal.............. 24Statistics ...................................... 27Common Keystroke Sequences ............. 30Error Conditions .............................. 35In Case of Difficulty........................... 37TI Product Service and Warranty

Information................................. 38

© 1996 by Texas Instruments Incorporated

2


General Information

Turning the Calculator On and Off

u (All Clear/On) —Turns on the calculator.

This key also clears the display, all pendingoperations, and values in memory or the moderegisters.

The calculator turns off automatically when thesolar cell panel is no longer exposed to light.

Modes

The calculator can operate in three differentmodes. Setting the calculator to a particularmode prepares it to perform special functions.The available modes are statistics, financial,and profit margin.

Indicators in the display tell you the calculator'scurrent mode. STAT displays for statistics, FINfor financial. No indicator is displayed for profitmargin mode.

2—Changes the calculator to the nextmode in sequence. To set the calculator to aparticular mode, press 2 repeatedly untilthe appropriate indicator is displayed.

Changing to a new mode clears the contents ofthe mode registers.

You can do arithmetic, mathematical, andpercentage operations in any mode.

3


Second Functions

0 (Second Function) —Enables you toperform the “second” functions that are markedover some of the keys. To perform a secondfunction, press 0 and then the appropriatefunction key.

When you press 0, 2nd appears in thedisplay until you press another key.

If you press 0 and then a key that does nothave a second function, the key performs itsnormal function. If you accidentally press 0,press it again to cancel its effect.

Clearing the Calculator

u (All Clear/On) —Clears the calculatorcompletely, including the display, all pendingoperations, and the memory and moderegisters. Pressing u also sets thecalculator to floating-decimal format andfinancial mode.

- (Clear Entry/Clear) —Clears incorrectentries, error conditions, the display, or pendingoperations. It does not affect the memory, themode registers, or the display format.

0 b (Clear Mode Registers) —Clears anyvalues that have been stored in the moderegisters.

Note: Changing to a new mode also clears thecontents of the mode registers.

4


The Display

The display shows a maximum of 10 digits,although the calculator internally retains amaximum of 13 digits.

Display Indicators

Indicator Meaning2nd The calculator will access the

second function of the nextkey pressed (appears whenyou press 0).

FIN The calculator is in thefinancial mode.

STAT The calculator is in thestatistics mode.Note: No indicator displayswhen the calculator is inprofit margin mode.

Begin The calculator computesannuities as beginning-of-period payments rather thanend-of-period payments.(Displayed only in thefinancial mode.)

(continued)

5


Indicator MeaningInDep The displayed result is for

the independent variables(x values). (Displayed only inthe statistics mode.)

Dep The displayed result is forthe dependent variables(y values). (Displayed only inthe statistics mode.)

Gprn The value in the display isthe summed principal over arange of payments.(Displayed only in thefinancial mode.)

prn The value in the display isthe principal for a singlepayment. (Displayed only inthe financial mode.)

Gint The value in the display isthe summed interest over arange of payments.(Displayed only in thefinancial mode.)

int The value in the display isthe interest for a singlepayment. (Displayed only inthe financial mode.)

6


Arithmetic Operations

Entering Numbers

6 - ? (Digits) —Enter digits into the display.You can enter a maximum of 10 digits and adecimal point.

A (Decimal Point) —Enters a decimal point.

@ (Change Sign) —Changes the sign of thenumber in the display. To enter a negativenumber, first enter the number as a positivevalue and then press @.

Arithmetic Keys

p, o, n, m—Perform the arithmeticoperations of addition, subtraction,multiplication, and division.

l (Equals) —Completes all pending operationsand displays the result of a calculation.

7


Correcting Errors

Correcting Entry Errors

- (Clear Entry/Clear) —To clear a numericalentry, press - once; then enter the correctnumber. To clear all pending operations andbegin the calculation again, press - twice.

w (x Exchange y) —Exchanges the valuesof x and y. If you enter x and y in the incorrectorder, press w to reverse them. Thencomplete the calculation.

v (Backspace) —Removes the last digit ordecimal point from the displayed number if youhave not yet pressed an operation key (p, o,n, m, etc.). This key is useful for correctingentry errors without having to clear the displayand start again.

Correcting Immediate Functions

You can often correct an immediate function byperforming the “reverse” operation. Forexample, if you press 0 ] by mistake, youcan correct the operation by pressing 0 k.

8


Display Formats

Floating-Decimal Format

The calculator normally displays numbers in“standard” floating-decimal format, in whichnumbers are displayed in the range-9,999,999,999 to -0.000000001, 0, or0.000000001 to 9,999,999,999. If the result of acalculation is too large or too small to bedisplayed in the normal format, it is displayed inscientific notation. This means the result isexpressed as a base value (mantissa) times 10raised to a power (exponent). For example, 5.912 means 5.9 x 1012.

The calculator is always in floating-decimalformat when you turn it on. By changing thedisplay format, you can convert a number fromone format to another.

0 c (Fixed Decimal) —Enables you to setthe number of decimal places displayed in aresult.

§ To set the number of decimal places, press0 c and then press the appropriate digitkey (6-?).

§ To remove the fixed-decimal setting andrestore floating-decimal format, press 0c A.

If a result has more than the selected numberof decimal places, the displayed number isrounded. If a result has fewer than the selectednumber of decimal places, trailing 0s areadded.

9


Memory Operations

The memory can store any numeric valuewithin the range of the calculator. You can usethe calculator’s memory to store, sum, andrecall a numeric value. You can use thememory in any mode.

r (Store) —Stores the displayed numericvalue in the memory, replacing any valuepreviously stored there. When 0 is displayed,you can clear the memory by pressing r,thereby storing a zero in memory.

t (Sum)—Adds the displayed numeric valueto the contents of the memory.

To add a series of numbers to the memory, user to store the first number (thereby replacingany previous value). Then use t with theremaining numbers. Use s 0 P todisplay the total.

To subtract the displayed value from the valuein memory, press @ (to change the sign of thedisplayed value) and then press t. Use s0 P to display the total.

s 0 P (Recall Memory) —Displays(recalls) the number stored in memory, withoutaffecting the contents of the memory.

10


Math Operations

0 \ (Reciprocal) —Calculates thereciprocal of the displayed number, which is thesame as one divided by the number.

0 ] (Square) —Raises the displayednumber to the second power, which is the sameas multiplying the number by itself. The numbercan be any value whose square is in the rangeof the calculator.

0 k (Square Root) —Calculates the squareroot of the displayed number. The displayednumber must be positive or zero; otherwise, anerror condition occurs. The result is alwayspositive.

0 H (Universal Power) —Raises anypositive number to any power within the rangeof the calculator or calculates any root of anypositive number within the range of thecalculator.

To calculate a power:

1. Enter the number (y) that you want to raiseto a power.

2. Press 0 H.

3. Enter the power (x).

4. Press l or any key that completes theoperation.

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To calculate a root:

1. Enter the number (y) whose root you want tofind.

2. Press 0 H.

3. Enter the root (x).

4. Press 0 \.

5. Press l or any key that completes theoperation.

0 G (Natural Logarithm) —Calculates thenatural logarithm (base e = 2.718281828459) ofthe displayed number. The number must bepositive; otherwise, an error condition occurs.

0 ^ (Natural Antilogarithm) — Calculatesthe natural antilogarithm of the displayednumber. This is equivalent to the value of eraised to the power of the number in thedisplay.

12


Percentage Calculations

E (Percent) —Calculate percentages,add-ons, discounts, and percentage ratios.

OperationKeySequence Function

Percentage n n E l Calculates n%of the principalamount.

Add-On p n E l Calculates n%of the principalamount andadds the resultto the principal.

Discount o n E l Calculates n%of the principalamount andsubtracts theresult from theprincipal.

PercentageRatio

m n E l Divides theprincipalamount by n%.

13


Percentage Change Calculations

0 4 (Percent Change) —Calculates thepercentage change between two values. Tocalculate the percentage change:

1. Enter the new value.

2. Press 0 4.

3. Enter the old value.

4. Press l.

The percentage change is calculated by theformula:

New value - Old valueOld value

x 100

If the result is positive, there is a percentageincrease. If the result is negative, there is apercentage decrease.

14


Margin and Markup Calculations

To calculate cost, selling price, gross profitmargin, or markup, use 2 to set thecalculator to the profit-margin mode (no displayindicator).

R (Cost) —Enters the cost.

S (Selling Price) —Enters the selling price.

U (Margin) —Enters the gross profit margin,which is the difference between selling priceand cost expressed as a percentage of theselling price .

0 Z (Markup) —Enters the markup, which isthe difference between selling price and costexpressed as a percentage of the cost .

If the percentage is positive, the selling price isgreater than the cost. If the percentage isnegative, the selling price is less than the cost.

1 (Computation Key) —Computes theunknown value for gross profit margin problemsand markup problems.

Recalling Values

To recall a value that you have entered orcomputed, press s and the appropriate keyfor the value you want to recall. For example, torecall the value for margin, press s U.

15


Performing Gross Profit MarginCalculations

To calculate cost, selling price, or gross profitmargin:

1. Press 0 b to clear the registers anduse 2 to enter the profit margin mode(no display indicator).

2. Enter the two known values (CST, SEL, orMAR).

3. Press 1 and the key for the unknownvalue.

Performing Markup Calculations

To calculate cost, selling price, or markup:

1. Press 0 b to clear the registers anduse 2 to enter the profit margin mode(no display indicator).

2. Enter the two known values (CST, SEL, orMU).

3. Press 1 and the key (or key sequence)for the unknown value.

16


Compound Interest Calculations

To calculate compound interest, use 2 toset the calculator to the to the financial mode(FIN appears in the display).

In compound interest calculations in which nopayment is involved, the payment (PMT) isassumed to be zero. When the payment has avalue other than zero, the calculator treats theproblem as an annuity (a series of regular,equal payments).

Compound Interest KeysIn compound interest calculations, the followingkeys are used to enter or calculate the valueslisted below.

C—Total number of compounding periods.

I—Percent interest per compounding period.

K—Present value of a future amount. With asavings account, for example, PV representswhat your money is worth today.

L—Future value of a present amount. With asavings account, for example, FV representswhat your money will be worth in the future.

1 (Computation Key) —Computes theunknown value for compound interestproblems.

17


Recalling ValuesTo recall a value that you have entered orcomputed, press s and the appropriate keyfor the value you want to recall. For example, torecall the present value, press s K.

Performing Compound Interest Calculations

To perform a compound interest calculation,you must know any three of the four values(N, %i, PV, or FV). Follow these steps to findthe unknown value:

1. Press 0 b to clear the registers anduse 2 to enter the financial mode (FINappears in the display).

2. Enter the three known values (N, %i, PV, orFV).


For compound interest calculations, thepayment (PMT) must be zero. This value is setautomatically when you press 2 to enter thefinancial mode or when you clear the financialregisters.

18


Annuity Calculations

For annuity calculations, use 2 to set thecalculator to financial mode (FIN appears in thedisplay).

An annuity is a series of equal payments madeat regular time periods with interest calculatedat the end of each period. Ordinary annuitieshave end-of-period payments; annuities duehave beginning-of-period payments.

0 a (Beginning-of-Period) —Sets thecalculator to compute for annuity-due problems(beginning-of-period payments).

Pressing 0 a causes Begin to appear inthe display. The beginning-of-period function isin effect until you cancel it (by pressing 0 aagain) or leave the financial mode.

§ When Begin is in the display, the calculatorsolves using beginning-of-period payments.

§ When Begin is not in the display, thecalculator solves using end-of-periodpayments.

Note: If an annuity problem does not usebeginning-of-period payments, be sure thatBegin is not in the display before you computethe answer. Having Begin in the display has noeffect on compound interest calculations inwhich no payment is involved.

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Annuity Keys

In annuity calculations, the following keys areused to enter or calculate the values listedbelow.

C—Total number of payment periods.

I—Percent interest per payment period.

K—Present value of a series of payments plusthe present value of FV. With a savingsaccount, PV represents an initial deposit (notincluding the first payment). With a loan, PVrepresents the loan amount.

M—Amount of the regular payment. Thisvalue may be positive or negative, dependingon the type of problem you are solving (asexplained on page 20).

L—Future value of a series of payments plusthe future value of PV. With a savings account,FV represents the final amount withdrawn. Witha loan, FV represents any balloon payment thatmust be made in addition to the last regularpayment.

1 (Computation Key) —Computes theunknown value for annuity problems.

§ When Begin is not displayed, the 1 keycomputes the unknown value for ordinaryannuities (annuities with end-of-periodpayments).

§ When Begin is displayed, the 1 keycomputes the unknown value for annuitiesdue (annuities with beginning-of-periodpayments).

20


Annuity Calculations (Continued)

Recalling Values

To recall a value that you have entered orcomputed, press s and the appropriate keyfor the value you want to recall. For example, torecall the present value, press s K.

Positive or Negative Payments

In annuity problems, the present value andfuture value are usually positive numbers. Thepayment amount may be positive or negative,depending on the type of problem you aresolving.

§ If payments are discounted backward, thepayment amount is positive. This is the casein mortgage, loan, bond, and leaseproblems.

These problems have a present value, butthey may or may not have a future value. (Ifthere is no future value, FV=0.)

§ If payments are compounded forward, thepayment amount is negative. This is thecase in savings problems.

These problems have a future value, butthey may or may not have a present value.(If there is no present value, PV=0.)

21


Performing Annuity Calculations

To perform an annuity calculation, you mustknow any four of the five values (N, % i, PV,PMT, or FV). Follow these steps to find theunknown value:

1. Press 0 b to clear the registers, anduse 2 to enter the financial mode (FINappears in the display).

2. Ensure that the calculator is set correctly forthe type of annuity calculation desired.

§ For ordinary annuities, Begin should notbe displayed.

§ For annuities due, Begin should bedisplayed.

Press 0 a to turn Begin on or off.

3. Enter the four known values (N, % i, PV,PMT, or FV).


Note: Generally, solving for the interest raterequires more time than other calculations. Ifyou use unrealistic values, the calculator maytake several minutes before indicating an errorcondition. If this occurs, press u to clearthe calculation.

22


Annuity Calculations (Continued)

Special Functions for MonthlyCompounding or Payment Periods

0 h (Monthly Interest) —Divides thenumber in the display by 12 and displays theresult. This number can then be stored as themonthly interest rate (%i). To use the 0 hkey sequence:

1. Enter the annual interest rate for acompound interest or annuity problem.

2. Press 0 h.

Then press I to store the result.

The two steps above have the same effect asentering the number of years and then pressingm 12 l.

0 i (Number of Monthly Payments) —Multiplies the number in the display by 12 anddisplays the result. This number can then bestored as the number of compounding periodsor payment periods (N). To use the 0 i keysequence:

1. Enter the number of years for a compoundinterest or annuity problem with monthlycompounding or payment periods.

2. Press 0 i.

Then press C to store the result.

The two steps above have the same effect asentering the number of years and then pressingn 12 l.

23


Converting to EFF or APR

To convert to EFF or APR, use 2 to set thecalculator to the financial mode (FIN appears inthe display.)

Annual Percentage Rate (APR) —The interestrate per compounding period multiplied by thenumber of compounding periods per year.

Annual Effective Rate (EFF) —The interestrate compounded yearly that achieves thesame future value as the APR. The EFF is therate at which you actually earn for the period oftime stated.

0 N (APR to EFF) —Converts annualpercentage rates to annual effective rates.

1. Enter the APR.

2. Press 0 N.

3. Enter the number of compounding periodsper year (c/yr) for the APR.

4. Press l to calculate the EFF.

0 O (EFF to APR) —Converts annualeffective rates to annual percentage rates.

1. Enter the EFF.

2. Press 0 O.

3. Enter the number of compounding periodsper year (c/yr) for the APR.

4. Press l to calculate the APR.

24


Balance, Interest, and Principal

To calculate balance, interest and principal, use2 to set the calculator to the financial mode(FIN appears in the display.)

W (Balance) —Calculates the remaining loanbalance (principal) after a selected payment.

To find the balance:

1. If necessary, press 0 a to change thecalculator to solve for end-of-periodpayments or beginning-of-period payments.

2. Enter the appropriate values with the C, I,K, L, and M keys.

3. Enter the payment number.

4. Press W.

V (Interest and Principal )—Calculates theinterest and principal portions of a singlepayment; when used with the X key, itcalculates the accumulated interest andprincipal over a range of payments.

X (Payment Range Entry Key) —Enters aselected range of payments (payment 1through payment x) so that you can calculatethe accumulated interest and principal over thatrange.

Note: When using X, enter the paymentnumber as an integer. Do not enter a decimalpoint.

25


Calculating a Single Payment

To find the interest and principal of a singlepayment:



3. Enter the payment number.

4. Press V to calculate the interest. (The intindicator is displayed with the result.)

5. Press w to display the principal. (The prnindicator is displayed with the result.)

If you want to display the interest portion again,press w. Pressing w alternately displays theinterest and principal.

26


Balance, Interest, and Principal (Cont.)

Calculating a Range of Payments

To find the summed interest and principal overa range of payments:



3. Enter the first payment number (P1) andpress X.

4. Enter the second payment number.

5. Press V to calculate the interest.

(The Gint indicator is displayed with theresult.)

6. Press w to display the principal.

(The Gprn indicator is displayed with theresult.)

If you want to display the interest portion again,press w. Pressing w alternately displays theinterest and principal.

27


Statistics

To enter a statistics problem, use 2 to setthe calculator to the statistics mode (STATappears in the display).

0 b (Clear Mode Registers )—Clears anypreviously entered data points.

g (Statistics Data Entry) —Enters thedisplayed number as a data value in thestatistical registers. Each time you press g,the display shows the number of data valuescurrently stored in the statistical registers.

0 f (Statistics Data Removal )—Removes a data value from the statisticalregisters. Each time you press 0 f, thedisplay shows the number of data valuescurrently stored in the statistical registers.

Entering Two-Variable Data Values

Use w in conjunction with g to enter datapoints with both x and y values as follows:

1. Enter an x value and press w.

2. Enter a y value and press g.

Repeat the procedure to enter additional datapoints. You can also follow this procedure with0 f to remove data points.

28


Statistics (Continued)

Mean

0 z (Data Mean)—Calculates the mean(average) of all the data values currently storedin the statistical registers.

If you have entered data points with x and yvalues, press 0 z to display the mean ofthe y values; then press w to display themean of the x values.

Standard Deviation

The 0 y and 0 x key sequencescalculate the standard deviation of the datavalues in the statistical registers.

If you entered data points with x and y values,press 0 y or 0 x to display thestandard deviation of the y values; then pressw to display the standard deviation of the xvalues.

0 y (“Population” Deviation) —Calculates the “n weighted” (or “population”)standard deviation.

0 x (“Sample” Deviation) —Calculatesthe “n - 1 weighted” (or “sample”) standarddeviation.

29


Linear Regression

0 { (Intercept/Slope) —Enables you todisplay the y-intercept and slope of therepresentative line. To display the y-intercept(b), press 0 {; to display the slope (a),press w after you display the y-intercept.

0 d (Correlation) —Calculates thecorrelation between the x and y values in a setof data points.

0 T, 0 Q (Predicted Value )—After youenter an x value, you can press 0 Q todisplay the y value that corresponds with that xon the best straight line through the data pointsentered. Similarly, after you enter a y value, youcan press 0 T to display the corresponding xvalue.

30


Common Keystroke Sequences

Monthly Payment for a Home Mortgage

Purpose: To find the amount of the monthlypayment on a mortgage with end-of-monthpayments (ordinary annuity).

Values You Supply:

§ mortgage amount§ annual interest rate§ number of years in mortgage

Procedure KeySequence

Clear calculator and moderegisters; select two decimalplaces.

- -0 b0 c 2

Press 2 until FIN isdisplayed. 2

Press 0 a until Begin isnot displayed.* 0 aEnter mortgage amount. mortgage KCalculate interest rate. rate 0 hEnter interest rate. I

Calculate number of paymentperiods. years 0 iEnter number of paymentperiods. C

Compute monthly payment. 1 M

* If payments occur at the beginning of eachmonth (annuity due), press 0 a untilBegin is displayed.

31


Remaining Balance for a Home Mortgage

Purpose: To find the remaining balance—aftera selected payment number—of a mortgagewith end-of-month payments (ordinary annuity).

Values You Supply:

§ mortgage amount§ annual interest rate§ number of years in mortgage§ amount of payment§ payment number

Procedure KeySequence

Clear calculator and moderegisters; select two decimalplaces.

- -0 b0 c 2


Press 0 a until Begin isnot displayed.* 0 aEnter mortgage amount. mortgage KCalculate interest rate. rate 0 hEnter interest rate. I

Calculate number of paymentperiods. years 0 iEnter number of paymentperiods. C

Enter payment amount. payment MEnter payment number andcalculate balance.* number W

* If payments occur at the beginning of eachmonth (annuity due), press 0 a untilBegin is displayed.

32


Common Keystroke Sequences (Cont.)

Loan Amount a Buyer Can Afford

Purpose: To find the maximum loan amountand selling price a prospective home buyer canafford, assuming that:

§ The buyer will pay a given percentage of theselling price as a down payment.

§ An estimated percentage is added to themonthly payment for taxes and insurance.

§ The total monthly payment (principal,interest, taxes, and insurance) is not toexceed a predetermined percentage limit ofthe buyer's gross monthly income.

Values You Supply:

§ annual interest rate§ number of years in mortgage§ buyer's gross monthly income§ percent limit (of gross monthly income)§ percent taxes and Insurance (of total

monthly payment)§ percent down (of selling price)

Procedure Key SequenceClear calculator andmode registers; selecttwo decimal places.

- -0 b0 c 2


(continued)

33


Procedure Key SequencePress 0 a untilBegin is not displayed.* 0 aEnter monthly interestrate. rate 0 h ICalculate and enternumber of monthlypayments.

years 0 iC

Calculate and storemaximum monthlypayment.

income npercent limit El r

Calculate and entermaximum allowable loanpayment (without taxesor insurance).

1 p percenttaxes andinsurance E l0 \ n s0 P l M

Compute maximumallowable loan amount. 1 PVCalculate house price(including downpayment).

1 o percentdownE l 0 \n s K l

Calculate down payment.o s K l

34


Common Keystroke Sequences (Cont.)

Selling Price of a House if Seller PaysPoints and Commission

Purpose: To find the selling price of a house,assuming that the seller wants to make acertain profit and that the selling price mustinclude points and commission.

Values You Supply:

§ original price (dollar amount)§ profit (dollar amount)§ points (percentage points)§ commission (percentage points)

Procedure Key SequenceClear calculator andmode registers; selecttwo decimal places.

- -0 b0 c 2

Press 2 until nomode indicator isdisplayed. 2

Add original price andprofit to calculate costbefore points are addedon, and enter.

original price pprofit l R

Enter points as a margin. points pcommission lU

Compute selling price. 1 S

35


Error Conditions

When an error condition occurs, the word“Error” appears in the display. The calculatorwill not accept a keyboard entry until you press- or u to clear the error condition.(Press - twice to clear the condition and allpending operations; press u to clear thecalculator completely.)

General Error ConditionsThe error conditions listed below can occur inany mode. Errors occur when you:

§ Calculate a result that is outside the range-9.999999 x 1099 to -1 x 10-99, zero, or 1 x10-99 to 9.999999 x 1099.

§ Divide a number by zero.

§ Calculate 0 G or 0 \ of zero.

§ Calculate 0 4 for an old value equal tozero.

§ Calculate 0 k, 0 G, or 0 H of anegative number.

§ Use 0 H to raise zero to the power ofzero.

§ Press a key or key sequence that cannot beperformed in the current mode.

Financial Error ConditionsIn the financial mode, errors occur when you:

§ Calculate a financial unknown before youhave entered enough known variables orwhen no solution exists.

36


Error Conditions (Continued)

Financial Error Conditions (Continued)

§ Use 0 O or 0 N when the numberof compounding periods per year is zero orvery large, or when %i is small.

§ Compute the balance or interest for apayment number less than zero.

Statistics Error Conditions

In the statistics mode, errors occur when you:

§ Use g to enter a data point (x or y) suchthat |x| > 1 x 1050.

§ Press 0 f when there are less than twodata points in the statistical registers.

§ Calculate 0 x with only one data point.

§ Perform a statistical calculation when thereare no data points.

§ Perform a linear regression calculation withless than two data points.

§ Perform a linear regression calculation on avertical line.

§ Enter a series of data values such that thesum of their squares exceeds the upper orlower limit of the calculator.

37


In Case of Difficulty

If you have difficulty operating the calculator,you may be able to correct the problem with thesolutions suggested in the table below.

Observation ActionDisplay is blank;digits do notappear.

The display goes blankduring a long calculation.Wait for it to finish.Be sure the solar powercells are exposed to anadequate light source.

A function doesnot seem towork.

Be sure the calculator isset for the correct mode—profit margin, FIN, orSTAT.

The number ofdecimal digitsthat you expectis not displayed.

Be sure the display is setto the correct format—floating decimal or fixeddecimal.

An error occurs. Check the error conditionslisted on pages 35-36.

If you experience difficulties other than thoselisted above, press u to clear thecalculator, and then repeat your calculation.

Review the operating instructions to be surethat you are performing the calculationcorrectly.

38


TI Product Service and WarrantyInformation

TI Product and Services Information

For more information about TI products andservices, contact TI by e-mail or visit the TIcalculator home page on the world-wide web.

e-mail address: [email protected]

internet address: http://www.ti.com/calc

Service and Warranty Information

For information about the length and terms ofthe warranty or about product service, refer tothe warranty statement enclosed with thisproduct or contact your local Texas Instrumentsretailer/distributor.

http://www.ti.com/calc

http://www.ti.com/calc/docs/communicate.htm

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