Thermocouple measurement module with 24-bit Delta-Sigma A/D conversion

February 13, 2013 // By Julien Happich
Featuring a 24-bit Delta-Sigma A/D converter and galvanic isolation, Data Translation's DT9828 data acquisition module brings exceptional accuracy to the low-cost segment of temperature measurements.

It provides eight differential analog inputs for thermocouple or voltage measurements in the millivolt range, as well as four digital inputs and four digital outputs. The thermocouples are automatically linearised on-board, which means that the Celsius values are transmitted to the PC with an accuracy of (typically) 0.1 degrees. This temperature data acquisition module achieves sampling rates of up to 600Hz. Screw terminals allow the quick and easy connection of the supported thermocouple types B, E, J, K, N, R, S and T. The 24-bit A/D converter, the cold junction compensation feature, and the automatic gain and offset calibration on every power-up ensure a high measurement accuracy.

All analog measurement channels are isolated from the USB ground. The two digital I/O ports, which each provide four inputs and four outputs, are also galvanically isolated from the bus and the analog channels. The digital inputs support the connection of TTL levels as well as 12 V or 24 V levels; the open collector outputs have a switching capacity of up to 30 V to drive relays directly. Running entirely on USB power, the data acquisition module is ideally suited for use as a portable device. It includes Data Translation's new QuickDAQ2013 data logger software.

Visit Data Translation at