This photo shows three Attached Expansion Modules (AEX) connected to the Control Module of a low voltage tester. The system pictured here provides 512 test points. When in use, you would attach 64-conductor flat cable to the headers on each expansion module. The flat cable would then extend to a custom-designed fixture or mating harness accommodates your multi-headed cable or wiring harness. You may also replace the two CB15 boards shown in the photo with 64-conductor flat cables. We can supply pre-assembled and tested sections of flat cable with 64-pin sockets (Item 854) if you would prefer not building them yourself.