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 exactly what is a 1/2 digit?
A full digit can indicate all numbers from ?0? to ?9?. A 1/2 digit, on the other hand, can only display a ?1?, a number ?2? or higher is not possible. With a 3 1/2-digit digital indicator, the indicatable selection of values is thus significantly limited in comparison to a 4-digit indicator.
Thus, on the one hand, the maximum of the indicatable range of values is only 1999 instead of 9999. However, no negative values can be indicated, since the minus sign can’t be displayed in the initial position. Therefore, the the least the indicatable range 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? Obsessed
-1999?1999
-9999?9999
Max. amount of positions after decimal point
2
3
3
Note
More info about digital indicators from WIKA are available on our website.
See also our article
Characteristics of the display of an electronic indicator ? there you will find general information on the main characteristic features of the display of an electronic indicator.

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