For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720 For Isolated Card A1 Advantech Output 4-Channel Analog PCI-1720