NI 5650/5651/5652 Temperature Monitoring

The NI 5650/5651/5652 hardware module includes two temperature sensors. One sensor is located inside the metal enclosure and monitors the RF analog circuitry temperature. Query this temperature sensor through NI-RFSG. NI-RFSG polls the temperature sensor at defined intervals to correct for amplitude and frequency deviations as the temperature of the metal enclosure changes.

The second temperature sensor is located outside the RF enclosure and monitors the temperature of the digital interface circuitry. This sensor is polled by the NI 5650/5651/5652 system control unit (not the instrument driver) every minute by default. If this sensor reads temperatures above 75 °C, it shuts down the PXI power rails to power down the RF enclosure and protect the RF circuitry from damage. When this sensor reads 75 °C on the digital circuit board, the temperature inside the metal RF enclosure is close to 80 °C.