The Pickoff Card

The new pickoff card, labeled.

The "pickoff card" attached to the SBX of each detector receives the single-ended signals for the Ge Center, Ge Sides, and BGO segments from the Slope Box. It converts these to differential signal format before sending them to the rest of the DAQ system.

The VXI Pickoff Card (Before Upgrades)

The large 50-conductor grey cables ran between the Slope Box on each detector to the Pickoff cards in the VXI crates.

The VXI Pickoff Card received the single-ended signals for the Ge Center, Ge Sides, and BGO segments from the Slope Box. The VXI pickoff converted them to differential signal format before sending them to the digitizer.

VXI Pickoff Card Features

• Three gain range options (jumper selectable from the bottom of the pickoff card) for the Ge Center: 2, 5, 10 MeV

• There is a fixed Preamp Reset Clamp that drives the Ge Center back to baseline after a preamp reset. This sometimes has known oscillation problems (ringing) that can hinder resolution.

• There is an analog output on the VXI board. This LEMO output is shaped similar to a NIM Spectroscopy Amplifier, it is NOT what gets sent to the digitizer.