Hello AustinEnvy,
The main requirement for the PCI-6518 is what version of the NI-DAQmx driver you have. The PCI-6518 requires NI-DAQmx 7.3 or later. The Measurement & Automation Explorer (MAX) software is bundled with the installation of the NI-DAQmx driver, and the earliest version of MAX that you can use with NI-DAQmx 7.3 is NI Measurement & Automation Explorer 3.1. So ultimately, you won't be able to use the PCI-6518 in MAX 2.2.
How does the Teradyne Spectrum ICT prevent you from upgrading to a newer version of MAX? Are you using a GPIB cards to communicate to that instrument? If so, you should be able to just upgrade your GPIB drivers for the newer version of MAX.
Let us know if you have any further questions.
Regards,
Travis G.
Applications Engineering
National Instruments
www.ni.com/support