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

Besides 3- and 4-digit digital indicators, additionally, there are 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 display a ?1?, a number ?2? or higher isn’t possible. With a 3 1/2-digit digital indicator, the indicatable selection of values is thus significantly limited in comparison with a 4-digit indicator.
Thus, on the main one hand, the utmost of the indicatable selection of values is 1999 rather than 9999. Alternatively, no negative values could be indicated, since the minus sign cannot be displayed in the initial position. Therefore, the the least the indicatable range 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?1999
-9999? Blinded of positions after decimal point
2
3
3
Note
More information 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 discover general information on the most important characteristic top features of the display of a digital indicator.

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