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HP 30b Business Professional Calculator  Operating Modes, Clearing Options, and Error Messages
Mode menu options
The HP 30b Mode function, accessed by pressing , allows users to customize the appearance and operation of the HP 30b to suit themselves. Table 11 below indicates the options you can change in the Mode menu, and the default settings, as when the HP30b is in a new or reset state. When using this menu, you may exit the menu by pressing .
Setting

Display Description

FIX= 2

Number of digits displayed to the right of the decimal point. Default is 2 decimal places.
Key in the number of digits you want and press , or press until the number of digits you want is displayed.
If you specify a value of 1 for FIX, the calculator displays numbers with the most appropriate number of digits after the decimal point.
Tip: if you find you need to change the FIX setting often, use this shortcut:

Degree or Radian

Angular mode for trigonometric functions. Default is Degree.
Pressing toggles between these options.

Date:
mm dd yyyy or
dd mm yyyy

Format for dates. December 3, 2010 is entered as 12.032010 in mm dd yyyy format, or 3.122010 in dd mm yyyy format.
note: Default is mm dd yyyy format.
Pressing toggles between these options.
Note that when a date is displayed, a number between 1 and 7 is displayed at the right of the display. This number indicates the day of the week corresponding to that date. Monday is 1 and Sunday is 7.
note: 
1.23 or 1,23

Selects decimal point or comma as decimal separator. Default is decimal point, 1.23.
Pressing toggles between these options.

1000.00 or 1,000.00 or 1000,00 or 1.000,00

Selects thousands separator. Default is none, 1000.00. Pressing cycles through these options.
note: 
Chain, Algebraic, or RPN

Calculation mode. Default is Chain.
Pressing cycles through these options.

English, Français, Deutch or Español

Language settings for the messages. Default is English.
Pressing cycles through these options.

Actual or
Cal.360

Calendar options for bonds and dates. Cal.360 uses twelve 30day months. Default is Actual.
Pressing toggles between these options.

Annual or Semiannual

Bond interest payment type. Default is Annual. Pressing toggles between these options.

TVM Standard or Canada

TVM mode. Standard mode sets compounding periods per year (C/YR) equal to payment periods per year (P/YR). Canada mode allows the compounding periods per year to be set independently. Pressing toggles between these options.

Begin/End mode
A special mode setting relates to the solution of problems known as annuities. This mode tells the HP 30b to solve these problems assuming that payments are made either at the beginning of a period or at the end of a period, which is why this mode is called Begin / End mode. When the HP 30b is in Begin mode, the display will show the word BEG in the top right corner of the screen. There is no indication in the HP 30b display when the calculator is in End mode, other than by the absence of the word BEG.
This mode is changed using the shifted BEG and END functions. The begin mode is on the front of the key and you press to activate begin mode. The end mode is on the front of the key and you press to activate end mode. When in begin mode, the HP 30b display will show a small BEG annunciator in the top right corner of the screen. If you receive an unexpected result when solving an annuity problem, make sure that the calculator is in the proper mode and try resolving the problem.
Adjusting display contrast
To adjust the brightness of the display, press and hold while pressing the or keys. Each press of the or keys slightly increases or decreases the contrast of the display.
Clearing options
Pressing one time cancels current number entries, mathematical operations, or a menu selection, in that order. Pressing repeatedly, with multiple operations pending, cancels one operation at a time, from the latest to the earliest. In algebraic or chain mode, to ensure nothing is pending at the start of a new calculation, press twice.
The reset menu
The Reset menu allows you to reset some, or all, of the menu items, variables, and registers to their default values. To open the Reset menu, press . TVM displays on the top line. Press repeatedly to scroll to a specific item. If you select the command to reset all values, All, you will be prompted to confirm your choice. To reset, press . At the All Reset message, press to reset all data in the calculator or to cancel.
Pressing while working within a particular menu takes you directly to the item of the Reset menu that allows you to reset that menu. Say, for example, you are working in the Bond menu and you wish to reset all your entries in the Bond menu. From anywhere in the Bond menu, press . Bond displays on screen. At this prompt, pressing resets the Bond menu and returns you to the last item you were working with in the Bond menu.
Since entering data in menus can represent a significant amount of work, when the reset commands for the cash flows, statistics and delete all (Del.All?) functions are used, you will be asked to confirm your choice. At the prompt, press to confirm, or to cancel. Once cleared, press to return to the cash flow or statistics menu.
Number entry
Enter numbers by pressing , , the key, and entering an exponent by pressing .
To correct a number entry, press . Each press of erases the last digit or symbol entered, starting with the least significant digit at the far right of the number. If you press after a calculation, the least significant digit of the result will be deleted, with each successive press deleting another digit.
note:This will delete the least significant digit of the number, which may not be the least significant digit displayed due to the chosen display setting.
Tip: This is perhaps the easiest way to see all the digits of a number, regardless of the chosen display format. Simply press after a calculation to see all the digits. Pressing one time will exit this edit mode without clearing the number in the display.
To enter a number in the display, press the digits successively. A number can have up to 12 digits. To change the sign of a number from positive to negative, press . Scientific notation is used to enter very large and very small numbers. For example, to enter the number 1.2345^{123} in scientific notation, first enter the mantissa, 1.2345, then press: and enter the number representing the exponent, 123. The exponent must have a value between 499 and +499.
Error messages
The table that follows shows the error messages that the HP 30b can produce and their meanings.
Error Message

Cause or Explanation

ER: Underflow

The calculation generated an underflow (result of 0).

ER: x/0

Division by zero.

ER: 0/0

Zero divided by zero.

ER:∞*0

Infinity multiplied by zero.

ER: ∞/∞

Infinity divided by infinity.

ER:

Square root of a negative number.

ER: LN (0)

Attempted to take the natural log (LN) of 0.

ER: (x<0)

Attempted to take the natural log (LN) of a negative number.

ER:

ASIN or ACOS of a number > 1.

ER: 1^ ∞

Attempted calculation of 1^(+/ infinity).

ER: (x<0) ^ ∞

Attempted calculation of the infinite power of a negative number.

ER: ∞^0

Attempted calculation of ∞^0.

ER: ∞^(Frac)

Attempted calculation of ∞^(noninteger y).

ER: (x<0)^(Frac)

Attempted calculation of negative x^(noninteger y).

ER: Out of Bounds

Input out of bounds.

ER: Invalid P/YR

Returned by TVM functions if payments per year are invalid (<0 or noninteger).

ER: Invalid Input

Returned by any functions if arguments are invalid for any reason.

ER: Invalid I%

Returned by finance functions if I% is ≤ 100%.

ER: No Solution

Returned when there is no solution to the problem.

ER: Many or No Solutions

Returned if there is no solution, or more than 1 solution to the problem.

ER: Many Solutions

Returned when there are many solutions to the problem.

ER: Invalid N

Returned by time value of money or amortization functions if the number of periods per year definition is invalid.

ER: User Abort

Returned by long functions if user requests break.

ER: ∞ Result

Returned if the result is infinite.

ER: Insufficient Data

Returned by statistics functions if there is insufficient data for analysis.

ER: No Payback

Returned by payback function if there is no payback on this problem.

ER: Unique solution to IRR Not Found

Returned if IRR tries to calculate a solution but cannot find it. User should supply a new guess and try again.

ER: Stack

Stack overflow.

ER: Parenthesis:

An error linked to use of parentheses: unmatched, too many, etc.

ER: Insufficient Memory

Insufficient memory.

ER: No Solution Found

No solution found.

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