Data truncated warning?

what does tthis warning mean?

This means that the value you try to put in this columns does not fit

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but isnt the data nothing (‘’)

Your voltage column(s) are probably defined as DECIMAL. An empty string is not a number and the supplied ‘’ value was truncated to change it be the nearest correct DECIMAL value that fits into the column definition, e.g. a 0. Use a correct value that matches the column definition or allow the column to be NULL and either supply a NULL value or leave the column out of the query, or setup a default value for the column and use the DEFAULT keyword in place of the value.