Using Bus Power for the PCIe DAQ

The 900 MS/s version of the Axsun PCIe DAQ (Rev C or later) can optionally draw its power from the host workstation's PSU (power supply unit) via its PCIe edge connector plugged into the workstation motherboard, instead of an external 12V AC/DC adapter plugged into the power input connector J3 via the Power-Y cable.

NOTE: It is the user's responsibility to ensure that the host's PSU is adequate to supply up to 25 W to the Axsun PCIe DAQ in addition to the PSU's other connected loads.

To configure the DAQ for PCIe bus-powered operation, install two 2.54 mm jumpers (aka shunts) on the 4-position vertical header J14, which is located in proximity to the PCIe edge connector. The installed jumpers must be oriented as indicated by the green rectangles in the photo below.

WARNING: Never attach an external power supply (e.g. 12V AC/DC adapter) to power input connector J3 while jumpers are also installed on J14 on the PCIe DAQ. If J14 jumpers are installed, we recommend installing an unwired "dummy" connector (Molex 43025-0600) into J3 to avoid inadvertently connecting both power sources concurrently.

Jumpers are not supplied by Excelitas, but can be easily procured from various sources, such as here.

Default configuration with no jumpers installed on J14; power must be delivered to DAQ via external supply on J3 connector.

Two jumpers installed on J14 in the correct orientation (green rectangles); DAQ will be powered by workstation PSU via motherboard.