I have Agilent 8164A Lightwave Measurement System with a HP 81689A Tunable Laser, 81600B Tunable Laser Soruce and 81635A Power Sensor. I am using Photonic Application Suite/Insertion Loss (PAS/IL) installed on a Windows machine and GPIB-USB-HS Interface Adapter Controller IEEE 488.. The PAS/IL recognizes the 81600B and the 81635A but NOT the 81689A. Any one can help? Thanks.