The first Precision Thermocouple Simulator-Calibrator was
introduced by Ectron in 1973. For the first time cal-lab
personnel could perform highly accurate thermocouple-instrument
calibration without requiring several instruments
and a look-up table.
Ectron simulators produce an emf on their output terminals exactly
duplicating the output of an ideal thermocouple heated to the selected
temperature. Used to calibrate thermocouple instrumentation, it is
only necessary to interconnect the simulator to the device under test.