If you want to configure the 1586A yourself to work with the 1586-2586 High-Capacity Module, you will need a relay card. However, if you already have a slot in the back panel of the 1586A configured for use with the 1586-2586, then you don’t need another relay card. You can simply slide the 1586-2586 High-Capacity Module into the preconfigured slot and begin taking measurements. The 1586-2586 High-Capacity Module is designed with universal input channels to measure temperature, resistance, dc voltage, and dc current for data acquisition applications where channel count and scan speed are important.