The API certainly should be able to interface several devices. We interface up to 8 devices in our manufacturing line using the API. What you will find is that most PCs will limit the number of actively streaming VSG60’s to 2, primarily limited by USB throughput and CPU cycles. Some PCs do struggle to transmit on 2 simultaneously. If you are also using one of our spectrum analyzers, you might consider moving the analyzer to another PC for making measurements.
If you are on Linux, please be sure to read the section on Linux in the VSG60 manual,
https://signalhound.com/sigdownloads/SDK/online_docs/vsg60_api/index.html#autotoc_md9
Opening a second device should be as simple as calling vsgOpenDevice a second time with a new handle variable. This will result in you having two handles, one for each device. The handle values should be 0 and 1 after the vsgOpenDevice function returns.
If you are on Windows, you can verify that you see 2 devices connected in the device manager. If you don’t, then you need to resolve this first. The LED should also be solid green on both units when connected and idle.
We have not tested multiple devices in our Python environment, but it should be the same. If possible, you can test multiple devices in C++. The Python wrapper simply wraps the C interface. You can see the function assignment in the vsg_api.py file.