Solution:

1. Please make sure that you have carefully routed signal cables to the card. You must separate the cabling from noise sources. Try to keep video monitors far away from the analog signal cables, because these are a common noise source in a PCI data acquisition system. 2. If you want to reduce common-mode noise, try to use differential analog input connections. 3. If you do not want your signals to be affected when travelling through areas with high electromagnetic interference or large magnetic fields, try the following routing techniques: Use individually shielded, twisted-pair wires to connect analog input signals to the board, i.e. the signals connected to the High and Low inputs are twisted together and covered with a shield. Finally, connect the shield only to one point at the signal source ground. 4. Make sure that your signal lines do not travel through conduits, because these may contain power lines. Also, keep your signals far from electric motors, breakers or welding equipment, as these can create magnetic fields. 5. Keep a reasonable distance between high-voltage (or high-current) lines and signal cables connected to the PCI-1710/1710HG card if the cables run parallel, or route signal cables at right angles to high voltage/current cables. In addition to outside noise, the transmitted signals themselves can affect the card's performance.We suggest connecting signal sources to the card using the PCL-10168 shielded cable in order to avoid this kind of interference. The PCL-10168 shielded cable is specially designed for the PCI-1710/1710HG for reducing noise in the analog signal lines. Its wires are all twisted pairs, and the analog lines and digital lines are seperately shielded, providing minimal cross talk between signals and the best protection against EMI/EMC problems.