TI BA-35 Solar Quick Reference Manual

BA-35 Solar Quick Reference Guide
Table of Contents
General Information ..........................
The Display ...................................
Arithmetic Operations ........................
Correcting Errors .............................
Display Formats ..............................
Memory Operations ..........................
Math Operations ..............................
Percentage Calculations .....................
Percentage Change Calculations ............
Margin and Markup Calculations ............
Compound Interest Calculations .............
Annuity Calculations..........................
Converting to EFF or APR ...................
Balance, Interest, and Principal ..............
Statistics ......................................
Common Keystroke Sequences .............
Error Conditions ..............................
In Case of Difficulty ...........................
TI Product Service and Warranty
Information.................................
© 1996 by Texas Instruments Incorporated
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General Information
Turning the Calculator On and Off
u (All Clear/On)—Turns on the calculator.
This key also clears the display, all pending
operations, and values in memory or the mode
registers.
The calculator turns off automatically when the
solar cell panel is no longer exposed to light.
Modes
The calculator can operate in three different
modes. Setting the calculator to a particular
mode prepares it to perform special functions.
The available modes are statistics, financial,
and profit margin.
Indicators in the display tell you the calculator's
current mode. STAT displays for statistics, FIN
for financial. No indicator is displayed for profit
margin mode.
2—Changes the calculator to the next
mode in sequence. To set the calculator to a
particular mode, press 2 repeatedly until
the appropriate indicator is displayed.
Changing to a new mode clears the contents of
the mode registers.
You can do arithmetic, mathematical, and
percentage operations in any mode.
2
Second Functions
0 (Second Function)—Enables you to
perform the “second” functions that are marked
over some of the keys. To perform a second
function, press 0 and then the appropriate
function key.
When you press 0, 2nd appears in the
display until you press another key.
If you press 0 and then a key that does not
have a second function, the key performs its
normal function. If you accidentally press 0,
press it again to cancel its effect.
Clearing the Calculator
u (All Clear/On)—Clears the calculator
completely, including the display, all pending
operations, and the memory and mode
registers. Pressing u also sets the
calculator to floating-decimal format and
financial mode.
- (Clear Entry/Clear)—Clears incorrect
entries, error conditions, the display, or pending
operations. It does not affect the memory, the
mode registers, or the display format.
0 b (Clear Mode Registers)—Clears any
values that have been stored in the mode
registers.
Note: Changing to a new mode also clears the
contents of the mode registers.
3
The Display
The display shows a maximum of 10 digits,
although the calculator internally retains a
maximum of 13 digits.
Display Indicators
Indicator
2nd
FIN
STAT
Begin
Meaning
The calculator will access the
second function of the next
key pressed (appears when
you press 0).
The calculator is in the
financial mode.
The calculator is in the
statistics mode.
Note: No indicator displays
when the calculator is in
profit margin mode.
The calculator computes
annuities as beginning-ofperiod payments rather than
end-of-period payments.
(Displayed only in the
financial mode.)
(continued)
4
Indicator
InDep
Dep
Gprn
prn
Gint
int
Meaning
The displayed result is for
the independent variables
(x values). (Displayed only in
the statistics mode.)
The displayed result is for
the dependent variables
(y values). (Displayed only in
the statistics mode.)
The value in the display is
the summed principal over a
range of payments.
(Displayed only in the
financial mode.)
The value in the display is
the principal for a single
payment. (Displayed only in
the financial mode.)
The value in the display is
the summed interest over a
range of payments.
(Displayed only in the
financial mode.)
The value in the display is
the interest for a single
payment. (Displayed only in
the financial mode.)
5
Arithmetic Operations
Entering Numbers
6 - ? (Digits)—Enter digits into the display.
You can enter a maximum of 10 digits and a
decimal point.
A (Decimal Point)—Enters a decimal point.
@ (Change Sign)—Changes the sign of the
number in the display. To enter a negative
number, first enter the number as a positive
value and then press @.
Arithmetic Keys
p, o, n, m—Perform the arithmetic
operations of addition, subtraction,
multiplication, and division.
l (Equals)—Completes all pending operations
and displays the result of a calculation.
6
Correcting Errors
Correcting Entry Errors
- (Clear Entry/Clear)—To clear a numerical
entry, press - once; then enter the correct
number. To clear all pending operations and
begin the calculation again, press - twice.
w (x Exchange y)—Exchanges the values
of x and y. If you enter x and y in the incorrect
order, press w to reverse them. Then
complete the calculation.
v (Backspace)—Removes the last digit or
decimal point from the displayed number if you
have not yet pressed an operation key (p, o,
n, m, etc.). This key is useful for correcting
entry errors without having to clear the display
and start again.
Correcting Immediate Functions
You can often correct an immediate function by
performing the “reverse” operation. For
example, if you press 0 ] by mistake, you
can correct the operation by pressing 0 k.
7
Display Formats
Floating-Decimal Format
The calculator normally displays numbers in
“standard” floating-decimal format, in which
numbers are displayed in the range
-9,999,999,999 to -0.000000001, 0, or
0.000000001 to 9,999,999,999. If the result of a
calculation is too large or too small to be
displayed in the normal format, it is displayed in
scientific notation. This means the result is
expressed as a base value (mantissa) times 10
raised to a power (exponent). For example, 5.9
12 means 5.9 x 10 12.
The calculator is always in floating-decimal
format when you turn it on. By changing the
display format, you can convert a number from
one format to another.
0 c (Fixed Decimal)—Enables you to set
the number of decimal places displayed in a
result.
§
To set the number of decimal places, press
0 c and then press the appropriate digit
key (6-?).
§
To remove the fixed-decimal setting and
restore floating-decimal format, press 0
c A.
If a result has more than the selected number
of decimal places, the displayed number is
rounded. If a result has fewer than the selected
number of decimal places, trailing 0s are
added.
8
Memory Operations
The memory can store any numeric value
within the range of the calculator. You can use
the calculator’s memory to store, sum, and
recall a numeric value. You can use the
memory in any mode.
r (Store)—Stores the displayed numeric
value in the memory, replacing any value
previously 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 value
to the contents of the memory.
To add a series of numbers to the memory, use
r to store the first number (thereby replacing
any previous value). Then use t with the
remaining numbers. Use s 0 P to
display the total.
To subtract the displayed value from the value
in memory, press @ (to change the sign of the
displayed value) and then press t. Use s
0 P to display the total.
s 0 P (Recall Memory)—Displays
(recalls) the number stored in memory, without
affecting the contents of the memory.
9
Math Operations
0 \ (Reciprocal)—Calculates the
reciprocal of the displayed number, which is the
same as one divided by the number.
0 ] (Square)—Raises the displayed
number to the second power, which is the same
as multiplying the number by itself. The number
can be any value whose square is in the range
of the calculator.
0 k (Square Root)—Calculates the square
root of the displayed number. The displayed
number must be positive or zero; otherwise, an
error condition occurs. The result is always
positive.
0 H (Universal Power)—Raises any
positive number to any power within the range
of the calculator or calculates any root of any
positive number within the range of the
calculator.
To calculate a power:
1. Enter the number (y) that you want to raise
to a power.
2. Press 0 H.
3. Enter the power (x).
4. Press l or any key that completes the
operation.
10
To calculate a root:
1. Enter the number (y) whose root you want to
find.
2. Press 0 H.
3. Enter the root (x).
4. Press 0 \.
5. Press l or any key that completes the
operation.
0 G (Natural Logarithm)—Calculates the
natural logarithm (base e = 2.718281828459) of
the displayed number. The number must be
positive; otherwise, an error condition occurs.
0 ^ (Natural Antilogarithm)— Calculates
the natural antilogarithm of the displayed
number. This is equivalent to the value of e
raised to the power of the number in the
display.
11
Percentage Calculations
E (Percent)—Calculate percentages,
add-ons, discounts, and percentage ratios.
Operation
Percentage
Key
Sequence
nnEl
Add-On
pnEl
Discount
onEl
Percentage
Ratio
mnEl
12
Function
Calculates n%
of the principal
amount.
Calculates n%
of the principal
amount and
adds the result
to the principal.
Calculates n%
of the principal
amount and
subtracts the
result from the
principal.
Divides the
principal
amount by n%.
Percentage Change Calculations
0 4 (Percent Change)—Calculates the
percentage change between two values. To
calculate 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 the
formula:
New value - Old value
x 100
Old value
If the result is positive, there is a percentage
increase. If the result is negative, there is a
percentage decrease.
13
Margin and Markup Calculations
To calculate cost, selling price, gross profit
margin, or markup, use 2 to set the
calculator to the profit-margin mode (no display
indicator).
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 price
and cost expressed as a percentage of the
selling price.
0 Z (Markup)—Enters the markup, which is
the difference between selling price and cost
expressed as a percentage of the cost.
If the percentage is positive, the selling price is
greater than the cost. If the percentage is
negative, the selling price is less than the cost.
1 (Computation Key)—Computes the
unknown value for gross profit margin problems
and markup problems.
Recalling Values
To recall a value that you have entered or
computed, press s and the appropriate key
for the value you want to recall. For example, to
recall the value for margin, press s U.
14
Performing Gross Profit Margin
Calculations
To calculate cost, selling price, or gross profit
margin:
1. Press 0 b to clear the registers and
use 2 to enter the profit margin mode
(no display indicator).
2. Enter the two known values (CST, SEL, or
MAR).
3. Press 1 and the key for the unknown
value.
Performing Markup Calculations
To calculate cost, selling price, or markup:
1. Press 0 b to clear the registers and
use 2 to enter the profit margin mode
(no display indicator).
2. Enter the two known values (CST, SEL, or
MU).
3. Press 1 and the key (or key sequence)
for the unknown value.
15
Compound Interest Calculations
To calculate compound interest, use 2 to
set the calculator to the to the financial mode
(FIN appears in the display).
In compound interest calculations in which no
payment is involved, the payment (PMT) is
assumed to be zero. When the payment has a
value other than zero, the calculator treats the
problem as an annuity (a series of regular,
equal payments).
Compound Interest Keys
In compound interest calculations, the following
keys are used to enter or calculate the values
listed below.
C—Total number of compounding periods.
I—Percent interest per compounding period.
K—Present value of a future amount. With a
savings account, for example, PV represents
what your money is worth today.
L—Future value of a present amount. With a
savings account, for example, FV represents
what your money will be worth in the future.
1 (Computation Key)—Computes the
unknown value for compound interest
problems.
16
Recalling Values
To recall a value that you have entered or
computed, press s and the appropriate key
for the value you want to recall. For example, to
recall 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 find
the unknown value:
1. Press 0 b to clear the registers and
use 2 to enter the financial mode (FIN
appears in the display).
2. Enter the three known values (N, %i, PV, or
FV).
3. Press 1 and the key for the unknown
value.
For compound interest calculations, the
payment (PMT) must be zero. This value is set
automatically when you press 2 to enter the
financial mode or when you clear the financial
registers.
17
Annuity Calculations
For annuity calculations, use 2 to set the
calculator to financial mode (FIN appears in the
display).
An annuity is a series of equal payments made
at regular time periods with interest calculated
at the end of each period. Ordinary annuities
have end-of-period payments; annuities due
have beginning-of-period payments.
0 a (Beginning-of-Period)—Sets the
calculator to compute for annuity-due problems
(beginning-of-period payments).
Pressing 0 a causes Begin to appear in
the display. The beginning-of-period function is
in effect until you cancel it (by pressing 0 a
again) or leave the financial mode.
§
When Begin is in the display, the calculator
solves using beginning-of-period payments.
§
When Begin is not in the display, the
calculator solves using end-of-period
payments.
Note: If an annuity problem does not use
beginning-of-period payments, be sure that
Begin is not in the display before you compute
the answer. Having Begin in the display has no
effect on compound interest calculations in
which no payment is involved.
18
Annuity Keys
In annuity calculations, the following keys are
used to enter or calculate the values listed
below.
C—Total number of payment periods.
I—Percent interest per payment period.
K—Present value of a series of payments plus
the present value of FV. With a savings
account, PV represents an initial deposit (not
including the first payment). With a loan, PV
represents the loan amount.
M—Amount of the regular payment. This
value may be positive or negative, depending
on the type of problem you are solving (as
explained on page 20).
L—Future value of a series of payments plus
the future value of PV. With a savings account,
FV represents the final amount withdrawn. With
a loan, FV represents any balloon payment that
must be made in addition to the last regular
payment.
1 (Computation Key)—Computes the
unknown value for annuity problems.
§ When Begin is not displayed, the 1 key
computes the unknown value for ordinary
annuities (annuities with end-of-period
payments).
§ When Begin is displayed, the 1 key
computes the unknown value for annuities
due (annuities with beginning-of-period
payments).
19
Annuity Calculations (Continued)
Recalling Values
To recall a value that you have entered or
computed, press s and the appropriate key
for the value you want to recall. For example, to
recall the present value, press s K.
Positive or Negative Payments
In annuity problems, the present value and
future value are usually positive numbers. The
payment amount may be positive or negative,
depending on the type of problem you are
solving.
§ If payments are discounted backward, the
payment amount is positive. This is the case
in mortgage, loan, bond, and lease
problems.
These problems have a present value, but
they may or may not have a future value. (If
there is no future value, FV=0.)
§
If payments are compounded forward, the
payment amount is negative. This is the
case in savings problems.
These problems have a future value, but
they may or may not have a present value.
(If there is no present value, PV=0.)
20
Performing Annuity Calculations
To perform an annuity calculation, you must
know any four of the five values (N, % i, PV,
PMT, or FV). Follow these steps to find the
unknown value:
1. Press 0 b to clear the registers, and
use 2 to enter the financial mode (FIN
appears in the display).
2. Ensure that the calculator is set correctly for
the type of annuity calculation desired.
§
For ordinary annuities, Begin should not
be displayed.
§
For annuities due, Begin should be
displayed.
Press 0 a to turn Begin on or off.
3. Enter the four known values (N, % i, PV,
PMT, or FV).
4. Press 1 and the key for the unknown
value.
Note: Generally, solving for the interest rate
requires more time than other calculations. If
you use unrealistic values, the calculator may
take several minutes before indicating an error
condition. If this occurs, press u to clear
the calculation.
21
Annuity Calculations (Continued)
Special Functions for Monthly
Compounding or Payment Periods
0 h (Monthly Interest)—Divides the
number in the display by 12 and displays the
result. This number can then be stored as the
monthly interest rate (%i). To use the 0 h
key sequence:
1. Enter the annual interest rate for a
compound interest or annuity problem.
2. Press 0 h.
Then press I to store the result.
The two steps above have the same effect as
entering the number of years and then pressing
m 12 l.
0 i (Number of Monthly Payments)—
Multiplies the number in the display by 12 and
displays the result. This number can then be
stored as the number of compounding periods
or payment periods (N). To use the 0 i key
sequence:
1. Enter the number of years for a compound
interest or annuity problem with monthly
compounding or payment periods.
2. Press 0 i.
Then press C to store the result.
The two steps above have the same effect as
entering the number of years and then pressing
n 12 l.
22
Converting to EFF or APR
To convert to EFF or APR, use 2 to set the
calculator to the financial mode (FIN appears in
the display.)
Annual Percentage Rate (APR)—The interest
rate per compounding period multiplied by the
number of compounding periods per year.
Annual Effective Rate (EFF)—The interest
rate compounded yearly that achieves the
same future value as the APR. The EFF is the
rate at which you actually earn for the period of
time stated.
0 N (APR to EFF)—Converts annual
percentage rates to annual effective rates.
1. Enter the APR.
2. Press 0 N.
3. Enter the number of compounding periods
per year (c/yr) for the APR.
4. Press l to calculate the EFF.
0 O (EFF to APR)—Converts annual
effective rates to annual percentage rates.
1. Enter the EFF.
2. Press 0 O.
3. Enter the number of compounding periods
per year (c/yr) for the APR.
4. Press l to calculate the APR.
23
Balance, Interest, and Principal
To calculate balance, interest and principal, use
2 to set the calculator to the financial mode
(FIN appears in the display.)
W (Balance)—Calculates the remaining loan
balance (principal) after a selected payment.
To find the balance:
1. If necessary, press 0 a to change the
calculator to solve for end-of-period
payments 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 the
interest and principal portions of a single
payment; when used with the X key, it
calculates the accumulated interest and
principal over a range of payments.
X (Payment Range Entry Key)—Enters a
selected range of payments (payment 1
through payment x) so that you can calculate
the accumulated interest and principal over that
range.
Note: When using X, enter the payment
number as an integer. Do not enter a decimal
point.
24
Calculating a Single Payment
To find the interest and principal of a single
payment:
1. If necessary, press 0 a to change the
calculator to solve for end-of-period
payments 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 V to calculate the interest. (The int
indicator is displayed with the result.)
5. Press w to display the principal. (The prn
indicator is displayed with the result.)
If you want to display the interest portion again,
press w. Pressing w alternately displays the
interest and principal.
25
Balance, Interest, and Principal (Cont.)
Calculating a Range of Payments
To find the summed interest and principal over
a range of payments:
1. If necessary, press 0 a to change the
calculator to solve for end-of-period
payments or beginning-of-period payments.
2. Enter the appropriate values with the C, I,
K, L, and M keys.
3. Enter the first payment number (P1) and
press X.
4. Enter the second payment number.
5. Press V to calculate the interest.
(The Gint indicator is displayed with the
result.)
6. Press w to display the principal.
(The Gprn indicator is displayed with the
result.)
If you want to display the interest portion again,
press w. Pressing w alternately displays the
interest and principal.
26
Statistics
To enter a statistics problem, use 2 to set
the calculator to the statistics mode (STAT
appears in the display).
0 b (Clear Mode Registers)—Clears any
previously entered data points.
g (Statistics Data Entry)—Enters the
displayed number as a data value in the
statistical registers. Each time you press g,
the display shows the number of data values
currently stored in the statistical registers.
0 f (Statistics Data Removal)—
Removes a data value from the statistical
registers. Each time you press 0 f, the
display shows the number of data values
currently stored in the statistical registers.
Entering Two-Variable Data Values
Use w in conjunction with g to enter data
points 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 data
points. You can also follow this procedure with
0 f to remove data points.
27
Statistics (Continued)
Mean
0 z (Data Mean)—Calculates the mean
(average) of all the data values currently stored
in the statistical registers.
If you have entered data points with x and y
values, press 0 z to display the mean of
the y values; then press w to display the
mean of the x values.
Standard Deviation
The 0 y and 0 x key sequences
calculate the standard deviation of the data
values in the statistical registers.
If you entered data points with x and y values,
press 0 y or 0 x to display the
standard deviation of the y values; then press
w to display the standard deviation of the x
values.
0 y (“Population” Deviation)—
Calculates the “n weighted” (or “population”)
standard deviation.
0 x (“Sample” Deviation)—Calculates
the “n - 1 weighted” (or “sample”) standard
deviation.
28
Linear Regression
0 { (Intercept/Slope)—Enables you to
display the y-intercept and slope of the
representative 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 the
correlation between the x and y values in a set
of data points.
0 T, 0 Q (Predicted Value)—After you
enter an x value, you can press 0 Q to
display the y value that corresponds with that x
on the best straight line through the data points
entered. Similarly, after you enter a y value, you
can press 0 T to display the corresponding x
value.
29
Common Keystroke Sequences
Monthly Payment for a Home Mortgage
Purpose: To find the amount of the monthly
payment on a mortgage with end-of-month
payments (ordinary annuity).
Values You Supply:
§ mortgage amount
§ annual interest rate
§ number of years in mortgage
Procedure
Clear calculator and mode
registers; select two decimal
places.
Press 2 until FIN is
displayed.
Press 0 a until Begin is
not displayed.*
Enter mortgage amount.
Calculate interest rate.
Enter interest rate.
Calculate number of payment
periods.
Enter number of payment
periods.
Compute monthly payment.
*
Key
Sequence
-0b
0c2
2
0a
mortgage K
rate 0 h
I
years 0 i
C
1M
If payments occur at the beginning of each
month (annuity due), press 0 a until
Begin is displayed.
30
Remaining Balance for a Home Mortgage
Purpose: To find the remaining balance—after
a selected payment number—of a mortgage
with 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
Clear calculator and mode
registers; select two decimal
places.
Press 2 until FIN is
displayed.
Press 0 a until Begin is
not displayed.*
Enter mortgage amount.
Calculate interest rate.
Enter interest rate.
Calculate number of payment
periods.
Enter number of payment
periods.
Enter payment amount.
Enter payment number and
calculate balance.*
*
Key
Sequence
-0b
0c2
2
0a
mortgage K
rate 0 h
I
years 0 i
C
payment M
number W
If payments occur at the beginning of each
month (annuity due), press 0 a until
Begin is displayed.
31
Common Keystroke Sequences (Cont.)
Loan Amount a Buyer Can Afford
Purpose: To find the maximum loan amount
and selling price a prospective home buyer can
afford, assuming that:
§
§
§
The buyer will pay a given percentage of the
selling price as a down payment.
An estimated percentage is added to the
monthly payment for taxes and insurance.
The total monthly payment (principal,
interest, taxes, and insurance) is not to
exceed a predetermined percentage limit of
the 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
Clear calculator and
mode registers; select
two decimal places.
Press 2 until FIN is
displayed.
Key Sequence
-0b
0c2
2
(continued)
32
Procedure
Press 0 a until
Begin is not displayed.*
Enter monthly interest
rate.
Calculate and enter
number of monthly
payments.
Calculate and store
maximum monthly
payment.
Calculate and enter
maximum allowable loan
payment (without taxes
or insurance).
Compute maximum
allowable loan amount.
Calculate house price
(including down
payment).
Key Sequence
0a
rate 0 h I
years 0 i
C
income n
percent limit E
lr
1 p percent
taxes and
insurance E l
0\ns
0PlM
1 PV
1 o percent
down
El0\
nsKl
Calculate down payment.
osKl
33
Common Keystroke Sequences (Cont.)
Selling Price of a House if Seller Pays
Points and Commission
Purpose: To find the selling price of a house,
assuming that the seller wants to make a
certain profit and that the selling price must
include points and commission.
Values You Supply:
§ original price (dollar amount)
§ profit (dollar amount)
§ points (percentage points)
§ commission (percentage points)
Procedure
Clear calculator and
mode registers; select
two decimal places.
Press 2 until no
mode indicator is
displayed.
Add original price and
profit to calculate cost
before points are added
on, and enter.
Enter points as a margin.
Compute selling price.
34
Key Sequence
-0b
0c2
2
original price p
profit l R
points p
commission l
U
1S
Error Conditions
When an error condition occurs, the word
“Error” appears in the display. The calculator
will not accept a keyboard entry until you press
- or u to clear the error condition.
(Press - twice to clear the condition and all
pending operations; press u to clear the
calculator completely.)
General Error Conditions
The error conditions listed below can occur in
any mode. Errors occur when you:
§
Calculate a result that is outside the range
-9.999999 x 10 99 to -1 x 10 -99, zero, or 1 x
10 -99 to 9.999999 x 10 99.
§
Divide a number by zero.
§
Calculate 0 G or 0 \ of zero.
§
Calculate 0 4 for an old value equal to
zero.
§
Calculate 0 k, 0 G, or 0 H of a
negative number.
§
Use 0 H to raise zero to the power of
zero.
§
Press a key or key sequence that cannot be
performed in the current mode.
Financial Error Conditions
In the financial mode, errors occur when you:
§
Calculate a financial unknown before you
have entered enough known variables or
when no solution exists.
35
Error Conditions (Continued)
Financial Error Conditions (Continued)
§
Use 0 O or 0 N when the number
of compounding periods per year is zero or
very large, or when %i is small.
§
Compute the balance or interest for a
payment 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) such
that |x| > 1 x 10 50.
§
Press 0 f when there are less than two
data points in the statistical registers.
§
Calculate 0 x with only one data point.
§
Perform a statistical calculation when there
are no data points.
§
Perform a linear regression calculation with
less than two data points.
§
Perform a linear regression calculation on a
vertical line.
§
Enter a series of data values such that the
sum of their squares exceeds the upper or
lower limit of the calculator.
36
In Case of Difficulty
If you have difficulty operating the calculator,
you may be able to correct the problem with the
solutions suggested in the table below.
Observation
Display is blank;
digits do not
appear.
A function does
not seem to
work.
The number of
decimal digits
that you expect
is not displayed.
An error occurs.
Action
The display goes blank
during a long calculation.
Wait for it to finish.
Be sure the solar power
cells are exposed to an
adequate light source.
Be sure the calculator is
set for the correct mode—
profit margin, FIN, or
STAT.
Be sure the display is set
to the correct format—
floating decimal or fixed
decimal.
Check the error conditions
listed on pages 35-36.
If you experience difficulties other than those
listed above, press u to clear the
calculator, and then repeat your calculation.
Review the operating instructions to be sure
that you are performing the calculation
correctly.
37
TI Product Service and Warranty
Information
TI Product and Services Information
For more information about TI products and
services, contact TI by e-mail or visit the TI
calculator 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 of
the warranty or about product service, refer to
the warranty statement enclosed with this
product or contact your local Texas Instruments
retailer/distributor.
38
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