I have a Windows 7 based N5245A PNA with firmware A.10.65.03. I am trying to configure an external 34401A DC meter but continue to get error's when the PNA triggers a DC reading. The same external device properties on an older XP based N5245A with firmware A.90.90.16 has no troubles. I can send and read commands correctly through the PNA on the device interface page. See attached file the I/O monitored error.