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

Besides 3- and 4-digit digital indicators, there are also 3 1/2-digit indicators available for sale. 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 display a ?1?, lots ?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 to a 4-digit indicator.
Thus, on the one hand, the utmost of the indicatable range of values is only 1999 rather than 9999. However, no negative values could be indicated, because the minus sign can’t be displayed in the first position. Therefore, the the least the indicatable selection of values is 0 instead of -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? Responsive
-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 Energy of the display of an electronic indicator ? there you can find general information on the most important characteristic features of the display of a digital indicator.

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