DEKAPOT Potentiometers are coaxial - dial Kelvin - Varley voltage dividers. Model DP 1211 has two decade dials and an interpolating potentiometer; Model DP1311 has three decade dials and an interpolating potentiometer.
Other models may differ in number of dials, physical length, or other details of specifications. Information in this sheet, except for these details, is applicable to all coaxial DEKAPOT potentiometers.
