Alban

Hi Gribo, Thanks for your reply. Below is the error . Invoke Node System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. Inner Exception: System.Runtime.InteropServices.COMException: VISA read error <append><b>System.Runtime.InteropServices.COMException</b> in RTP5000_IVICOM.lvlib:Initialize.vi->Untitled 1

Hi , I am trying to remote control Boonton RTP5540 using Labview and get error as in the attached picture , error 1172. I am new to IVI drivers usage. IVI drivers were already installed. Please give any information that can lead to resolve this . Thanks in advance. Regards, Alban