IZ1228/IZ1228M
: - : negative number display
Symbols
E : error display
, : punctuation comma
M : non-zero memory indicator
C1, C2 : currency exchange operations indicator
Error detections
• System errors occur when:
1) The division by zero.
2) The extraction of square root of a negative number.
• Rough estimate calculation error occur when
The integral part of the result of any standard functions, percentage, square, reciprocal, or
power calculations exceed 8 digits.
Error indication
• System error
“0” is indicated in the 1-digit position and “E” in the sign-digit position.
• Rough estimate calculation error
The high-order 8-digit calculation result is indicated together with “E”.
The decimal point is indicated in the position corresponding to a calculation result of time 10-8,
and no zero shift is performed
Error release
• System error
A system error can be release by the ON/C key.
• Rough estimate calculation error
A rough estimate calculation error can be released by the ON/C, CE key.
Number entry
Numerical can be entered up to 8 digits. Numerical entries equal to 9 digits or more are ignored.
Memory protection
In any error detection, the special memory content is retained when auto power off.
Key bounce protection
Front edge
Down to 1 word and up to about 3 words.
Trailing edge
9 words
1 word is 3.3ms when display frequency is fd = 100Hz.
Auto power OFF
Power automatically turns off after 9 - 11 minutes pass from the last key pressure. The special
memory content is saving when power auto off.
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