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 full digit can indicate all numbers from ?0? to ?9?. A 1/2 digit, in contrast, can only just display a ?1?, a number ?2? or higher isn’t 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 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 cannot be displayed in the initial position. Therefore, the minimum of 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 which have another space for the display of the sign. Displays with this characteristic can therefore also indicate values 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? Doomed with separate sign
-999?999
-1999?1999
-9999?9999
Max. number 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 can find general information on the most important characteristic features of the display of a digital indicator.

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