Conversely, selecting TMC allows the instrument to be connected as an IVI device and be automatically recognised by the VISA layer. It defaults to CDC mode, appearing on the connected computer as a serial COM port and being accessible without the need of any VISA layer or IVI drivers. The NGU401 allows for the USB interface to be configured for Communications Device Class (CDC) or Test and Measurement Class (TMC) connectivity. Note: This review was done with the instrument running firmware versions 3.047 through to 3.067. Thankfully, the NGU401 is a pretty quick instrument when it comes to handling SCPI commands and computing power is usually plentiful. This makes it simple to work with, but imposes greater requirements on the host and communication channel to keep the data flowing smoothly and to perform mathematical computations on the data. Architecturally, the NGU401 seems to have evolved from power-supply roots to an SMU, so the unit doesn’t feature any onboard reading buffers or onboard command scripting which are common features amongst its competitors. The NGU401 offers most common types of connectivity including USB-TMC, USB-CDC, LAN and optionally GPIB, with external digital trigger I/O option and a modulation input (covered in the previous chapter). This could involve automation through directly controlling the unit through SCPI commands, using the supplied start-up software or an automation framework such as LabVIEW. Owing to its design, the power of a fast instrument such as the NGU401 can really only be fully utilised through connected operation with a host.
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