Improper CJC will directly introduce errors in the temperature measurements. It is very important for a thermocouple based Thermal Data Logger to have accurate CJC. However, Unlike Chroma Thermal Data Loggers, most of Thermal Data Loggers in the field have multiple channels sharing one CJC. In fact, each channel should have a different CJC because of different physical layouts. Consequently, sharing one CJC can’t provide very accurate temperature measurement for all channels.

In contrast, Chroma Thermal Data Loggers conduct CJC on every measurement channel. This secures the specified 0.3°C measurement accuracy applies to all channels while others accuracy spec is effective on the CJC channel only.