zero scale, negative (of an analog-to-digital converter or digital-to-analog converter with no true zero)

A term used to refer a characteristic to the negative step closest to analog zero.

NOTE 1 The subscript for the letter symbol of a characteristic at negative zero scale is
"ZS-", e.g., V_ZS-, I_ZS-.

NOTE 2 In place of a letter symbol, the abbreviation "ZS-" is commonly used.