Detecting Internal/Auxiliary Power

Use an auxiliary power source to enable the full-power capabilities of NI power supplies and SMUs that support this feature. NI-DCPower can dynamically query whether the auxiliary power is connected to the device. The niDCPower Auxiliary Power Source Available property or the NIDCPOWER_ATTR_AUXILIARY_POWER_SOURCE_AVAILABLE attribute returns TRUE if auxiliary power is connected to the device and FALSE if only internal power is available on the device.

NI power supplies and SMUs cannot differentiate between an auxiliary power loss or a blown fuse on the auxiliary power input line. If auxiliary power is properly connected and the niDCPower Auxiliary Power Source Available property or the NIDCPOWER_ATTR_AUXILIARY_POWER_SOURCE_AVAILABLE attribute returns FALSE, you might need to replace the auxiliary power input fuse.