How do I use an external temperature reference with a channel expansion module (CEM)?
The datataker DT5/6xx models have an built-in temperature sensor that is used as the default cold junction temperature reference for thermocouple measurements. The Channel Expansion Module (CEM) has its own built-in temperature sensor that is used with thermocouple measurements on the the CEM. If thermocouple sensors are measured on both the main data logger unit and an attached CEM then multiple temperature references are required. An external temperature sensor such as an RTD is used to improve the accuracy of the cold junction temperature compensation. Care must be taken when a CEM is used as the the datataker automatically determines which temperature reference to use based on the following rules. • If NO external temperature reference channel is defined then the default internal references are used. Any thermocouples measured on the main logger will use the loggers internal temperature sensor as the cold junction temperature reference. Any channels measured on a CEM will use that
Related Questions
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