multi-turn potentiometer

A string potentiometer is a multi-turn potentiometer operated by an attached reel of wire turning against a spring, enabling it to convert linear position to a variable resistance.

Each of the PT100 input channels is a complete signal conditioner with a DIP switch array for coarse setting, and, Span and Zero multi-turn potentiometers for fine tuning on each channel.

In contrast, an active load presents to the source a resistance value varied by electronic control, either by an analogue adjusting device such as a multi-turn potentiometer or, in automated test setups, by a digital computer.