++dmm_loop <0|1> to disable the HP3478A DMM loop, if for some reason the DMM app loop is interfering with the GPIB bus when used as a USB-GPIB controller
++dmm_loop <0|1> to disable the HP3478A DMM loop, if for some reason the DMM app loop is interfering with the GPIB bus when used as a USB-GPIB controller