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Is there unified software to control scope, signal gen, and power supply?

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Berni:
I have not seen any good GUI software for doing simple SCPI automation (No i don't like LabView)

But yes SCPI is basically "ASCII over a serial port" so it makes it easy to write your own software in whatever language you like. I would NOT recommend using C and similar low level ones for that since string manipulation is a pain in those. More modern languages let you get stuff coded a lot faster with less lines of code. I like to use .net for that since it makes a GUI really easy. But Python is also great for when you want to simply run it from a console or work on Linux.

I would still recommend installing a VISA library. You get the choice from all the big manufacturers NI, Keysight, Rigol, R&S..etc The reason you want it is that it simplifies connection to the instrument where you just open a VISA device by name and it works. Does not matter if it is over USB, RS232, Ethernet, GPIB, PXI over PCIe, GPIB-Ethernet bridge etc... it just magically connects when called by name.

You can mix and match VISA libraries and equipment manufacturers, so pick whatever one you like. I prefer the Keysight one (they call it "Keysight IO") since it lets you also spy on the SCPI traffic and inject commands for debug, also has a decent GUI for setting things up.
https://www.keysight.com/de/de/lib/software-detail/computer-software/io-libraries-suite-downloads-2175637.html

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