I use Agilent 4352b（a Signal Analyze） and 8664A（a Signal generator）.4352b connect 8664A through a GPIB.
Now I want to connect 4352b through Keysight 82357B （a GPIBtoUSB converter） .
I search out some GPIB port ：
GPIB0::16::INSTR
GPIB0::17::0::IINSTR
GPIB0::17::1::IINSTR
GPIB0::17::13::IINSTR
GPIB0::17::14::IINSTR
GPIB0::17::15::IINSTR
GPIB0::17::16::IINSTR
but they all can't connect ！
why?