Sharp EL-531LH
Brief History
After the EL-531G and EL-531GH models which can be a bit difficultly used with ’straightforward’ logic, Sharp designed the new member of the 531 family with full-function expression-processing system with two-line display: the new EL-531L (EL-509L) with button celss, and the EL-531LH (EL-509LH) with AA-sized batteries used the Advanced DAL operating logic which can display the entire expressions entered into the calculator, so make possible easier checking and even overwriting the calculation. These machines — with smaller or larger modifications — are still in production.
| Manufacturer: | Sharp Corporation (Japan/China) |
| Mfg. date: | 1996-98 |
| Size: | 8,3×15,5×2,2 cm |
| Weight (ready for operate): | 128 g |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 12+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) 3 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 nCrprobability calculations P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 10+2+2 digit LCD |
| Power: | 2×AA-type battery |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0000006699 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688090276E-70 |
EL-531LH
PCB of the EL-531LH
Keyboard and display of the EL-531LH
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