Now Playing: How to Make a Thermocouple Meter with the LTC2492 - Linear Technolog
  • Description:  with Mark Thoren, Applications Engineering Manager - Mixed Signal Products | Thermocouples are perhaps the most common temperature sensor in use. And while they are extremely simple and rugged, the output is very small - tens of microvolts per degree Celsius. Traditionally, thermocouple measurement circuits use a cold junction compensation circuit to drive the thermocouple negative terminal and a low offset amplifier with enough gain to use the entire input span of a 12- or 16-bit ADC. Linear Technologys LTC2492 greatly simplifies thermocouple instrument design. A simple filter and protection circuit is all that is required to build a rugged, ready-to-use meter. Some software tricks take care of cold junction compensation and the thermocouples non-linear output.