3 1/2- vs. 4-digit digital indicator ? Exactly what is a 1/2 digit?

Besides 3- and 4-digit digital indicators, there are also 3 1/2-digit indicators available in the market. But what is a 1/2 digit?
A complete digit can indicate all numbers from ?0? to ?9?. A 1/2 digit, on the other hand, can only just display a ?1?, a number ?2? or higher is not possible. With a 3 1/2-digit digital indicator, the indicatable range of values is thus significantly limited in comparison with a 4-digit indicator.
Thus, on the main one hand, the maximum of the indicatable range of values is 1999 rather than 9999. On the other hand, no negative values could be indicated, since the minus sign cannot be displayed in the first position. Therefore, the minimum of the indicatable selection of values is 0 rather than -1999.
An exception to the limitation of the indicatable negative value range is represented by indicators that have a separate space for the display of the sign. Displays with this particular characteristic can therefore also indicate values right down to -1999.
Number of digits
3-digit indicator
3 1/2-digit indicator
4-digit indicator
Representation
Max. scale range, standard
-199?999
0?1999
-1999?9999
Max. scale range with separate sign
-999?999
-1999?1999
-9999?9999
Max. amount of positions after decimal point
2
3
3
Note
More info about digital indicators from WIKA can be found on our website.
See also Pioneering of the display of an electronic indicator ? there you will discover general information on the most important characteristic features of the display of an electronic indicator.

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