The following recommendations apply mainly to AI signal routing to the USB-6451, although they also apply to signal routing in general.

Minimize noise pickup and maximize measurement accuracy by taking the following precautions:

• Use differential analog input connections to reject common-mode noise.
• Use individually shielded, twisted-pair wires to connect AI signals to the USB-6451. With this type of wire, the signals attached to the positive and negative input channels are twisted together and then covered with a shield. You then connect this shield only at one point to the signal source ground. This kind of connection is required for signals traveling through areas with large magnetic fields or high electromagnetic interference.