11.6.4 How To Perform A Free Air Calibration on TRO2

The TRo2 has red status LEDs for each channel. When powered, the LEDs blink at a slow rate until the corresponding sensor has reached normal operating temperature. After installation, the TRo2 requires free air calibration. This should be done with the sensors dangling in free air. The environment must be free of hydrocarbon vapors. It is suggested that the free air calibration be performed outdoors.