The Fluke 1586-2586-RLY is a replacement or additional Relay Card for a High Capacity Module.
A relay card that is used with the Fluke 1586A Precision Temperature Scanner. It is designed to work with the 1586-2586 High-Capacity Module and is used for data acquisition applications where channel count and scan speed are important.
The relay card is not required if you already have a slot in the back panel of the 1586A configured for use with the 1586-2586.