Sharp EL-531A
Brief History
After the very popular EL-531, and its almost identical successor, EL-531S (EL-530S and EL-531 in the US, respecively), Sharp decided to create the new EL-531 variation for use with button cells instead of penlight (AA) batteries. The EL-531A introduced in 1986 has some new features such as fixed point notation, or converting angles between degrees, radians or grads.
The EL-531H was in production from 1988, but except the design, it was identical to the EL-531A.
| Manufacturer: | Sharp Corporation (Japan) |
| Mfg. date: | 1986-88 |
| Size: | 6,9×12,7×1,5 cm |
| Weight (ready for operate): | 72 g |
| Type: | scientific |
| Capacity: | 8/6+2 digits (input/display) 11+2 digits (internal precision) |
| Operating logic: | algebraic with precedence |
| CPU: | SC7892 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 15 bracket (with saving the pending operation) 1 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 (0-7) Sciscientific (exponential) notation Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation n!factorial |
| Display: | 8+1 digit LCD |
| Power: | 2×LR44 button cell |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.000009718 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.0068804248E-70 |
EL-531A
Inside of the EL-531A
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