AM8040 Precision Thermometer User’s GuidePage 124. General OperationsAM8040 is a high accuracy digital thermometer working with a four-wire platinum resistance thermometer (PRT) sensor.The details of AM8040 operations are shown as follows:5.1. Connecting the probe/sensorFour-wire sensor should be connected to the “Sensor” terminals atthe rear panel. Figure 3 shows how the four wire sensor should beconnected.It should be noted that the “Measurement/Calibration” switchshould be at “Measurement” position.Measurement/Calibration SwitchFigure 3: Rear Panel and Sensor Terminals5.2. Instrument connection with AC powerAM8040 must work with power of AC100V~240V.pairorspairors