Sharp EL-531WH
Brief History
The new W series (EL-531W with button cells, EL-531WG with solar cell, EL-531WH with AA-sized battery) of the EL-531 product line introduced some improvements in design and functionality, too. The new random number generating functions (dice, coin, and the first 100 integer numbers), memory clearing options and calculation settings were arranged to menus. Support of the base-5 number system was a novelty, too. Sharp imroved the calculation algorithms, the most important modification is the internal precision of 14+2 digits.
In 2011, the W series were replaced by the X series. Only the design changed: simple "parallel" shape, shiny surface and color variations of the backplate presents the most striking changes. These models with minor modifications (T series) are still in production.
| Manufacturer: | Sharp Corporation (Japan/China) |
| Mfg. date: | 2005-2010 |
| Size: | 7,9×15,5×1,7 cm |
| Weight (ready for operate): | 138 g |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 14+2 digits (internal precision) |
| Operating logic: | formula-interpreting |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 16 bracket (with saving the pending operation) 10 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-9) Sciscientific (exponential) notation Engengineering notation a b/callows entry and display of fractions BSbackspace (right-shift) function Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) hyphyperbolic functions (sinh, cosh, tanh and inverses: ar sinh, ar cosh, ar tanh) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation LRtwo-variable statistics: linear regression nCrprobability calculations P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 10+2+2 digit LCD |
| Power: | 1×AA battery |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.999999997245 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.0068804211269E-70 |
EL-531WH
PCB of the EL-531WH
Display and keyboard of the EL-531WH
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